Live/247 Rank/Maryland

Maryland 24/7 Rank

Every station in Maryland ranked by its 247 score out of 100: how reliably it reports, how accurate its readings are against a reference station, how they pass their checks and how they stand against the forecast, over the last seven days.

736 stations ranked21.0% sent every report dueranked October 16, 2026page 2 of 3Maryland instrumentsMaryland weather

A station is ranked once its week holds enough reports to measure: 12, or 3 days for a gauge that reports once a day. Of the 736 ranked here, 731 have a page of their own; the rest are platforms heard here that have not yet reported enough to be listed.

Every station, ranked

Rank	Station	Score	Network	County	Received	Reports	Arrives in	Longest silence
246	Rain Gage in Broad Creek Basin at Whiteford394237076210901	95.5	Gauge	Harford	100%	168 of 168	28 min	78 min
252	Chicamacomico Creek 1.6 E Chicamacomico River Near Salem MDCMCM2	95.4	Gauge	Dorchester	99.4%	167 of 168	27 min	2 h
252	Deer Creek AT DarlingtonDRLM2	95.4	Gauge	Harford	99.4%	167 of 168	27 min	2 h
252	Greensboro - Choptank RiverGNBM2	95.4	Gauge	Caroline	99.4%	167 of 168	27 min	2 h
252	Little Gunpowder Falls AT Laurel BrookLBFM2	95.4	Gauge	Baltimore	99.4%	167 of 168	27 min	2 h
252	YOUGHIOGHENY RIVER AT OaklandOAKM2	95.4	Gauge	Garrett	99.4%	167 of 168	27 min	2 h
257	Prince Frederick 1.4 WMD-CV-7	95.3	Volunteer	Calvert	100%	7 of 7	10.4 h	24 h
258	North Branch Potomac River 2 S CumberlandCBEM2	95.3	Gauge	Allegany	99.4%	167 of 168	28 min	2 h
259	North Branch Potomac River AT KitzmillerKITM2	95.3	Gauge	Garrett	99.4%	167 of 168	28 min	2 h
260	Abingdon - Bynum RunBRAM2	95.2	Gauge	Harford	99.4%	167 of 168	28 min	2 h
260	Beetree Run AT Bentley SpringsBSBM2	95.2	Gauge	Baltimore	99.4%	167 of 168	28 min	2 h
260	St Clement Creek AT ClementsCLMM2	95.2	Gauge	St Marys	99.4%	167 of 168	28 min	2 h
260	KennedyvilleKENM2	95.2	Gauge	Kent	99.4%	167 of 168	28 min	2 h
260	Zekiah Swamp Run AT NewtownZSRM2	95.2	Gauge	Charles	99.4%	167 of 168	28 min	2 h
265	Patapsco River AT HollofieldPRHM2	95.2	Gauge	Baltimore	98.8%	166 of 168	27 min	2 h
266	Deer Creek AT Rocks State ParkRSPM2	95.2	Gauge	Harford	98.8%	166 of 168	27 min	2 h
267	Potomac River AT HancockHNKM2	95.1	Gauge	Washington	98.8%	166 of 168	28 min	2 h
267	North Branch Potomac River AT SteyerSTYM2	95.1	Gauge	Garrett	98.8%	166 of 168	28 min	2 h
269	Savage River 3 NW BloomingtonSRVM2	95.1	Gauge	Garrett	98.8%	166 of 168	28 min	2 h
270	Georges Run AT BeckleysvilleBCKM2	95.1	Gauge	Baltimore	98.8%	166 of 168	28 min	2 h
270	Savage River 5 NW BartonBTNM2	95.1	Gauge	Garrett	98.8%	166 of 168	28 min	2 h
270	Big Elk Creek AT Elk MillsEKMM2	95.1	Gauge	Cecil	98.8%	166 of 168	28 min	2 h
270	Long Green Creek AT Glen ArmGALM2	95.1	Gauge	Baltimore	98.8%	166 of 168	28 min	2 h
270	Usgs Well Ca Fd 54LSWM2	95.1	Gauge	Calvert	98.8%	166 of 168	28 min	2 h
270	Jones Falls 1.5 SW SorrentoSRTM2	95.1	Gauge	Baltimore	98.8%	166 of 168	28 min	2 h
276	Joppatowne - Foster BranchJPAM2	95.0	Gauge	Harford	98.8%	332 of 336	28 min	60 min
277	Anapolis - 8575512APAM2	95.0	Gauge	Anne Arundel	92.6%	778 of 840	17 min	36 min
278	Nw Branch Patapsco River AT Fort McHenry TideBLTM2	95.0	Gauge	Baltimore City	92.5%	777 of 840	17 min	36 min
278	Choptank River AT CambridgeCAMM2	95.0	Gauge	Dorchester	92.5%	777 of 840	17 min	36 min
278	Chesapeake City - 8573927CHCM2	95.0	Gauge	Cecil	92.5%	777 of 840	17 min	36 min
278	Atlantic AT Ocean City InletOCIM2	95.0	Gauge	Worcester	92.5%	777 of 840	17 min	36 min
278	Solomons Island - 8577330SLIM2	95.0	Gauge	Calvert	92.5%	777 of 840	17 min	36 min
283	Paint Branch AT College ParkCPPM2	94.9	Gauge	Montgomery	98.5%	331 of 336	28 min	60 min
284	Monocacy River AT FrederickFRMM2	94.9	Gauge	Frederick	98.2%	165 of 168	28 min	2 h
284	Antietam Creek AT SharpsburgSACM2	94.9	Gauge	Washington	98.2%	165 of 168	28 min	2 h
286	Honga River AT Bishops HeadBISM2	94.9	Gauge	Dorchester	92.2%	775 of 840	17 min	36 min
287	Beaver Run AT FinksburgFNKM2	94.8	Gauge	Carroll	100%	168 of 168	31 min	63 min
288	Swan Creek AT Swan CreekSWNM2	94.7	Gauge	Harford	97.6%	164 of 168	28 min	2 h
289	Gunpowder Falls AT HoffmanvilleGFHM2	94.7	Gauge	Baltimore	97.6%	164 of 168	28 min	2 h
289	Manokin River 1.4 NE Manokin Branch near Princess AnneMNBM2	94.7	Gauge	Somerset	97.6%	164 of 168	28 min	2 h
291	NB Patapsco River AT CedarhurstCDHM2	94.6	Gauge	Carroll	99.4%	167 of 168	31 min	2 h
292	St Marys River AT Great MillsGMRM2	94.6	Gauge	St Marys	97.6%	164 of 168	28 min	2 h
293	Sawmill Creek AT Glen BurnieGBSM2	94.6	Gauge	Anne Arundel	96.4%	162 of 168	26 min	2 h
294	Youghiogheny River AT HoyesHOYM2	94.5	Gauge	Garrett	97.0%	163 of 168	28 min	2 h
295	Cranberry Branch AT WestminsterWESM2	94.2	Gauge	Carroll	99.4%	334 of 336	33 min	60 min
296	James Run AT BelcampBLCM2	94.2	Gauge	Harford	98.2%	165 of 168	31 min	2 h
297	St InigoesNUI	94.2	Airport	St Marys	86.3%	145 of 168	11 min	3 h
298	AT Tolchester BeachTCBM2	94.1	Gauge	Kent	92.2%	775 of 840	21 min	36 min
299	Youghiogheny River Near Mchenry03076100	94.0	Gauge	Garrett	95.8%	161 of 168	28 min	2 h
299	Rain Gage At Youghiogheny River Near Mchenry393133079243901	94.0	Gauge	Garrett	95.8%	161 of 168	28 min	2 h
301	AT WoodstockWOOM2	94.0	Gauge	Baltimore	87.5%	147 of 168	13 min	2.3 h
302	Hebron 3.6 WMD-WC-27	94.0	Volunteer	Wicomico	85.7%	6 of 7	86 min	2 days
303	Long Green 0.6 SWMD-BL-9	94.0	Volunteer	Baltimore	85.7%	6 of 7	86 min	24 h
304	Laurel 1.3 NNEMD-HW-38	94.0	Volunteer	Howard	85.7%	6 of 7	86 min	37.1 h
305	Trappe 4.8 WMD-TB-23	94.0	Volunteer	Talbot	85.7%	6 of 7	86 min	2 days
306	Snow Hill 0.4 SMD-WR-14	94.0	Volunteer	Worcester	85.7%	6 of 7	86 min	2 days
307	Annapolis 2.4 SMD-AA-98	94.0	Volunteer	Anne Arundel	85.7%	6 of 7	86 min	2 days
308	Elkton 4.8 NWMD-CC-16	94.0	Volunteer	Cecil	85.7%	6 of 7	2.4 h	24 h
309	Jarrettsville 1.9 ESEMD-HR-28	94.0	Volunteer	Harford	85.7%	6 of 7	2.4 h	2 days
310	Westminster 1.2 NEMD-CR-41	94.0	Volunteer	Carroll	85.7%	6 of 7	2.4 h	47 h
311	Grantsville 2.0 ESEMD-GR-15	94.0	Volunteer	Garrett	85.7%	6 of 7	2.4 h	2 days
312	Montgomery Village 1.1 ENEMD-MG-138	94.0	Volunteer	Montgomery	85.7%	6 of 7	2.4 h	2 days
313	Parsonsburg 2WPARM2	94.0	Cooperative	Wicomico	85.7%	6 of 7	2.5 h	2 days
314	Potomac River AT Edwards FerryEDFM2	93.8	Gauge	Montgomery	95.2%	160 of 168	27 min	2 h
315	Nepp Site At ReisterstownRSTM2	93.8	Gauge	Baltimore	85.7%	6 of 7	2.9 h	2 days
316	Patuxent River NASNHK	93.5	Airport	St Marys	87.5%	147 of 168	5 min	4 h
317	WLLM2WLLM2	93.3	DCP	-	85.7%	6 of 7	4 h	47 h
318	Tuckahoe RAWSTUKM2	93.2	Gauge	Caroline	91.0%	153 of 168	17 min	5 h
319	South CumberlandCBLM2	93.1	Cooperative	Allegany	85.7%	6 of 7	4.3 h	24 h
320	Jones Falls (Street Car Museum)JSCM2	93.1	Gauge	Baltimore City	84.8%	342 of 403	13 min	36 min
321	MD-404 at Choptank RiverMD074	93.0	Road	Caroline	96.4%	324 of 336	26 min	2.7 h
322	US-13 at US-113MD070	92.9	Road	Worcester	96.4%	324 of 336	26 min	2.7 h
323	US-301 at MD-5MD041	92.9	Road	Prince Georges	96.4%	324 of 336	26 min	2.7 h
324	US-1 at Baltimore / Harford Co. LineMD021	92.9	Road	Baltimore	96.4%	324 of 336	26 min	2.7 h
324	I-70 at MD-32MD052	92.9	Road	Montgomery	96.4%	324 of 336	26 min	2.7 h
326	US-50 at MD-331MD038	92.9	Road	Wicomico	96.4%	324 of 336	26 min	2.7 h
326	I-270 at MD-109MD056	92.9	Road	Montgomery	96.4%	324 of 336	26 min	2.7 h
328	Jones Falls (Falls And Smith)JFSM2	92.9	Gauge	Baltimore City	85.3%	344 of 403	15 min	36 min
329	Nerrs Water Quality Site Near RiversideLTQM2	92.8	Gauge	Harford	89.7%	201 of 224	23 min	60 min
330	Catoctin Mountain Raws Near Foxville 1NeFOXM2	92.7	Gauge	Frederick	100%	168 of 168	19 min	69 min
331	I-70 @ I-81MD011	92.7	Road	Washington	96.4%	324 of 336	26 min	2.7 h
332	MD-213 at SassafrasMD039	92.7	Road	Cecil	96.4%	324 of 336	26 min	2.7 h
333	US 301 at MD 305MD075	92.7	Road	Queen Anne's	96.4%	324 of 336	26 min	2.7 h
334	MD 231 at Patuxent RiverMD087	92.7	Road	Charles	96.4%	324 of 336	26 min	2.7 h
335	MD-43 at MD-150MD063	92.7	Road	Baltimore	96.4%	324 of 336	26 min	2.7 h
336	I-68 at Sideling HillMD012	92.7	Road	Washington	96.4%	324 of 336	26 min	2.7 h
337	I-83 at MD-137MD009	92.7	Road	Baltimore	96.4%	324 of 336	26 min	2.7 h
337	US-340 @ MD-180MD016	92.7	Road	Frederick	96.4%	324 of 336	26 min	2.7 h
339	Thurmont 0.8 SSEMD-FR-10	92.6	Volunteer	Frederick	85.7%	6 of 7	5.4 h	2 days
340	I-70 at Frederick / Wash. Co lineMD015	92.5	Road	Frederick	96.4%	324 of 336	26 min	2.7 h
341	Powder Mill ScanPWDM2	92.3	Gauge	Prince Georges	99.4%	167 of 168	42 min	2 h
342	MD-24 at Rocks State ParkMD034	91.8	Road	Baltimore	96.4%	324 of 336	26 min	2.7 h
343	Maiden Choice Run At S Dukeland AveMCRM2	91.6	Gauge	Baltimore City	80.3%	352 of 438	13 min	60 min
344	I-97 at MD-32MD026	91.4	Road	Anne Arundel	96.4%	324 of 336	26 min	2.7 h
344	I-95/495 at I-295MD062	91.4	Road	Prince Georges	96.4%	324 of 336	26 min	2.7 h
346	Hagerstown 1EHGCM2	91.4	Cooperative	Washington	85.7%	6 of 7	8 h	2 days
347	US-50 at Kent NarrowsMD040	91.3	Road	Queen Annes	96.4%	324 of 336	26 min	2.7 h
348	Dayton AFWSDAYM2	91.3	Gauge	Howard	82.9%	836 of 1,008	13 min	43 min
349	Huntingtown 2.9 NNWMD-CV-17	91.2	Volunteer	Calvert	85.7%	6 of 7	8.4 h	2 days
350	MD 20 at MD 21MD101	91.1	Road	Kent	96.4%	324 of 336	35 min	2.7 h
351	I-495 at American Legion Bridge MD US MDDOTMD002	90.8	Road	Montgomery	96.4%	324 of 336	26 min	2.7 h
352	US-50 @ I-95MD000	90.8	Road	Prince Georges	96.4%	324 of 336	26 min	2.7 h
353	Queenstown 3SQNSM2	90.6	Cooperative	Queen Anne's	85.7%	6 of 7	9.9 h	36.1 h
354	I-70 at I-695MD007	90.4	Road	Howard	96.4%	324 of 336	26 min	2.7 h
355	I-95 at Patuxent RiverMD006	90.3	Road	Prince Georges	96.4%	324 of 336	26 min	2.7 h
356	I-97 at MD-100MD027	90.3	Road	Anne Arundel	96.4%	324 of 336	26 min	2.7 h
357	Linthicum 0.4 ENEMD-AA-35	90.3	Volunteer	Anne Arundel	85.7%	6 of 7	10.4 h	24 h
358	Bunting Bridge On Assateague Island National SeashoreASIM2	90.1	Gauge	Worcester	80.4%	193 of 240	20 min	1.8 h
359	US-50 at ChoptankMD004	89.6	Road	Dorchester	96.4%	324 of 336	26 min	2.7 h
360	Harwood 2.5 WNWMD-AA-94	89.0	Volunteer	Anne Arundel	71.4%	5 of 7	26 min	3 days
361	Arnold 1.6 NMD-AA-91	89.0	Volunteer	Anne Arundel	71.4%	5 of 7	26 min	2.5 days
362	Accident 2.4 NEMD-GR-16	89.0	Volunteer	Garrett	71.4%	5 of 7	26 min	25 h
363	Chestertown 0.7 NNWMD-KN-12	89.0	Volunteer	Kent	71.4%	5 of 7	26 min	3 days
364	Columbia 2.4 NNWMD-HW-55	89.0	Volunteer	Howard	71.4%	5 of 7	85 min	2.9 days
365	Sykesville 1.7 SSEMD-HW-2	89.0	Volunteer	Howard	71.4%	5 of 7	86 min	2 days
366	Great Mills 4.0 SMD-SM-22	89.0	Volunteer	St. Marys	71.4%	5 of 7	86 min	2 days
367	Riva 0.8 NNWMD-AA-84	89.0	Volunteer	Anne Arundel	71.4%	5 of 7	86 min	3 days
368	Rossmoor 1.3 ESEMD-MG-55	89.0	Volunteer	Montgomery	71.4%	5 of 7	86 min	2.5 days
369	Beltsville 1.4 NNWMD-PG-82	89.0	Volunteer	Prince Georges	71.4%	5 of 7	86 min	2 days
370	Elkton 6.8 NMD-CC-18	89.0	Volunteer	Cecil	71.4%	5 of 7	86 min	2 days
371	Worton 3.9 NWMD-KN-4	89.0	Volunteer	Kent	71.4%	5 of 7	86 min	2 days
372	West Laurel 1.1 NMD-PG-85	89.0	Volunteer	Prince Georges	71.4%	5 of 7	86 min	24 h
373	Delmar 0.2 NEMD-WC-4	89.0	Volunteer	Wicomico	71.4%	5 of 7	86 min	2.1 days
374	Pasadena 2.3 NMD-AA-100	89.0	Volunteer	Anne Arundel	71.4%	5 of 7	86 min	3 days
375	Parsonsburg 1.6 WNWMD-WC-9	89.0	Volunteer	Wicomico	71.4%	5 of 7	2.4 h	3 days
376	Oxford - Coop Oxford LabCXLM2	88.9	Gauge	Talbot	98.2%	165 of 168	58 min	2 h
377	GreenbeltGRNM2	88.9	Gauge	Prince Georges	74.1%	747 of 1,008	13 min	35 min
378	I-70 at MD-27MD017	88.5	Road	Howard	95.8%	322 of 336	26 min	2.7 h
379	Silver Spring 4.2 NMD-MG-137	88.5	Volunteer	Montgomery	71.4%	5 of 7	3.4 h	2 days
380	StevensvilleSTVM2	88.3	Cooperative	Queen Annes	71.4%	5 of 7	3.8 h	3 days
381	Chesapeake City 6.5 WSWMD-CC-21	88.1	Volunteer	Cecil	71.4%	5 of 7	4.4 h	2 days
382	Walkersville 0.1 SSWMD-FR-52	88.1	Volunteer	Frederick	71.4%	5 of 7	4.4 h	3 days
383	Denton 5.8 WSWMD-CL-10	88.1	Volunteer	Caroline	71.4%	5 of 7	4.4 h	37.1 h
384	MD-4 at PatuxentMD045	87.8	Road	Calvert	81.9%	413 of 504	21 min	2.3 h
385	Herring Run At Echodale AvenueHREM2	87.7	Gauge	Baltimore City	69.4%	350 of 504	13 min	60 min
386	Gwynns Falls AT Washington Blvd BaltimoreWBGM2	87.6	Gauge	Baltimore City	69.0%	348 of 504	13 min	60 min
387	Riggs Rd./Sligo CreekCHLM2	87.5	Gauge	Prince Georges	68.8%	347 of 504	13 min	41 min
388	Nw Branch Anacostia River AT BrentwoodBNTM2	87.5	Gauge	Prince Georges	68.8%	347 of 504	13 min	60 min
389	Baltimore County - Alert GageLKRM2	87.5	Gauge	Baltimore	68.6%	346 of 504	13 min	60 min
390	US 219 S at Deep Creek LakeMD145	87.2	Road	Garrett	82.5%	416 of 504	25 min	2.3 h
391	US-1at ConowingoMD005	87.2	Road	Cecil	80.9%	281 of 347	26 min	2.3 h
392	MD 260 at Cox RdMD103	87.2	Road	Calvert	79.8%	277 of 347	26 min	2.4 h
393	MD-64 at MD-418MD106	87.1	Road	Washington	96.4%	324 of 336	26 min	2.7 h
394	US 301 SB North of MD 4MD099	87.1	Road	Prince Georges	82.3%	415 of 504	25 min	2.3 h
395	Forest Hill 1.7 SSEMD-HR-15	87.1	Volunteer	Harford	71.4%	5 of 7	6.4 h	2.5 days
396	Leonardtown 0.6 NEMD-SM-3	87.0	Volunteer	St. Marys	85.7%	6 of 7	17.4 h	38.1 h
397	MD-33 at Knapps Narrows Drawbrid MD US MDDOTMD073	87.0	Road	Talbot	78.9%	274 of 347	26 min	2.3 h
398	MD-30 at PA LineMD020	86.2	Road	Carroll	96.4%	324 of 336	26 min	2.7 h
399	I-68 at WV LineMD129	85.9	Road	Garrett	96.1%	323 of 336	26 min	2.7 h
400	Kensington 0.1 WMD-MG-40	85.3	Volunteer	Montgomery	71.4%	5 of 7	10.4 h	24 h
401	Moores Run At Moravia Ind PkMOOM2	85.2	Gauge	Baltimore City	74.6%	301 of 403	14 min	4.6 h
402	Citizen station FW8736FW8736	85.2	Citizen	Queen Anne's	65.0%	164 of 252	18 s	3.5 h
403	Queenstown 2.6 SMD-QA-6	84.0	Volunteer	Queen Anne's	57.1%	4 of 7	26 min	2 days
404	New Market 1.7 NWMD-FR-41	84.0	Volunteer	Frederick	57.1%	4 of 7	86 min	25 h
405	Upper Marlboro 7.0 NEMD-PG-101	84.0	Volunteer	Prince Georges	57.1%	4 of 7	86 min	3 days
406	Cockeysville 2.9 WSWMD-BL-45	84.0	Volunteer	Baltimore	57.1%	4 of 7	86 min	2 days
407	Ocean Pines 1.2 SSWMD-WR-10	84.0	Volunteer	Worcester	57.1%	4 of 7	86 min	2 days
408	Easton 0.8 ESEMD-TB-16	84.0	Volunteer	Talbot	57.1%	4 of 7	2.4 h	2 days
409	US-13 at US-50MD037	83.9	Road	Worcester	72.5%	348 of 480	26 min	2.4 h
410	Citizen station FW0596FW0596	83.9	Citizen	Anne Arundel	62.5%	105 of 168	16 s	4.5 h
411	Citizen station FW0699FW0699	83.8	Citizen	Carroll	62.1%	313 of 504	18 s	2 h
412	Citizen station KG4K-13KG4K-13	83.5	Citizen	Anne Arundel	62.7%	158 of 252	17 s	4.2 h
413	Academy Hill 1.1 WSWMD-CV-36	83.5	Volunteer	Calvert	57.1%	4 of 7	86 min	3.5 days
414	Jefferson 1.6 SSEMD-FR-24	83.5	Volunteer	Frederick	57.1%	4 of 7	3.4 h	35.1 h
415	Citizen station EW3247EW3247	83.4	Citizen	Howard	61.1%	154 of 252	17 s	4 h
416	Citizen station CW2057CW2057	83.2	Citizen	Howard	63.1%	318 of 504	21 s	2.7 h
417	Citizen station EW9304EW9304	83.2	Citizen	Washington	63.1%	106 of 168	18 s	4.3 h
418	Citizen station CW1767CW1767	83.2	Citizen	Wicomico	61.9%	104 of 168	17 s	7 h
419	MD-51 at Oldtown Salt DomeMD071	83.1	Road	Allegany	79.5%	276 of 347	26 min	2.4 h
420	Citizen station FW7376FW7376	83.1	Citizen	Washington	59.2%	119 of 201	18 s	4.4 h
421	Mount Washington 0.5 NMD-BC-3	83.1	Volunteer	Baltimore City	57.1%	4 of 7	2.4 h	4 days
422	Oakland2G4	83.0	Airport	Garrett	99.6%	502 of 504	12 min	40 min
423	US-301at Potomac Riv.MD023	83.0	Road	Charles	68.2%	344 of 504	21 min	2.3 h
423	Bay Bridge N-13 W/BMD065	83.0	Road	Queen Anne's	68.2%	344 of 504	21 min	2.3 h
423	Bay Bridge S-9 E/BMD066	83.0	Road	Anne Arundel	68.2%	344 of 504	21 min	2.3 h
423	Hatem Bridge US 40 W/BMD067	83.0	Road	Cecil	68.2%	344 of 504	21 min	2.3 h
423	I-95 at Millard E. Tydings Memor MD US MDDOTMD150	83.0	Road	Cecil	68.2%	344 of 504	21 min	2.3 h
423	US 50 EB on OC Drawbridge Wind S MD US MDDOTMD151	83.0	Road	Worcester	68.2%	344 of 504	21 min	2.3 h
423	MDTA Bridge GraphsMD154	83.0	Road	Anne Arundel	68.2%	344 of 504	21 min	2.3 h
423	US 301 NB at G-17 (VIS-3 in VA)MD156	83.0	Road	Charles	68.2%	344 of 504	21 min	2.3 h
431	I-95 at Tydings BrMD024	83.0	Road	Cecil	68.2%	344 of 504	22 min	2.3 h
431	I-95 at I-695MD044	83.0	Road	Baltimore	68.2%	344 of 504	22 min	2.3 h
431	MD-200 WB at Muncaster Mill RdMD069	83.0	Road	Montgomery	68.2%	344 of 504	22 min	2.3 h
431	MD-200 EB at Bonifant RdMD140	83.0	Road	Montgomery	68.2%	344 of 504	22 min	2.3 h
435	Citizen station W3DAKW3DAK	83.0	Citizen	Baltimore	60.7%	102 of 168	17 s	6.5 h
436	Citizen station DW8362DW8362	83.0	Citizen	Frederick	60.3%	304 of 504	15 s	2.1 h
437	Citizen station EW3221EW3221	83.0	Citizen	Anne Arundel	58.3%	98 of 168	18 s	5.1 h
438	Citizen station GW1751GW1751	82.9	Citizen	Wicomico	59.9%	302 of 504	17 s	2.1 h
439	US 301 NB on NMB at G-10 (RWIS a MD US MDDOTMD155	82.8	Road	Charles	68.2%	344 of 504	22 min	2.3 h
440	Thomas Johnson BridgeMD147	82.7	Road	Calvert	68.9%	331 of 480	26 min	2.4 h
441	Chevy Chase 1.2 SWMD-MG-152	82.6	Volunteer	Montgomery	57.1%	4 of 7	3.4 h	4 days
442	La Plata 5.8 SEMD-CH-36	82.6	Volunteer	Charles	57.1%	4 of 7	5.4 h	2 days
443	US-50 at MD-2MD029	82.5	Road	Anne Arundel	71.2%	342 of 480	26 min	2.3 h
444	Citizen station CW1729CW1729	82.5	Citizen	Dorchester	57.7%	97 of 168	18 s	5.5 h
445	MD-136 at MD-646MD042	82.4	Road	Harford	68.2%	344 of 504	25 min	2.3 h
445	MD 24 at Jarrettsville RoadMD059	82.4	Road	Harford	68.2%	344 of 504	25 min	2.3 h
445	US-29 @ Middle Patuxent RiverMD152	82.4	Road	Howard	68.2%	344 of 504	25 min	2.3 h
448	Citizen station CW6344CW6344	82.4	Citizen	Saint Mary's	58.1%	150 of 258	17 s	3.8 h
449	Citizen station DW2917DW2917	82.3	Citizen	Carroll	57.7%	97 of 168	18 s	5.5 h
450	I 95 S - past MD 212MD003	82.2	Road	Prince Georges	68.2%	344 of 504	25 min	2.3 h
450	I-195 @ MD-295MD010	82.2	Road	Anne Arundel	68.2%	344 of 504	25 min	2.3 h
450	I-95 at Howard / Baltimore Co. LineMD019	82.2	Road	Anne Arundel	68.2%	344 of 504	25 min	2.3 h
450	MD-175 at MD-295MD031	82.2	Road	Anne Arundel	68.2%	344 of 504	25 min	2.3 h
450	I-70 at MD-522MD047	82.2	Road	Washington	68.2%	344 of 504	25 min	2.3 h
450	I-70 at MonacacyMD050	82.2	Road	Frederick	68.2%	344 of 504	25 min	2.3 h
450	I-495 @ MD-4MD054	82.2	Road	Prince Georges	68.2%	344 of 504	25 min	2.3 h
450	MD 23 @ MeadowTree Rd.MD058	82.2	Road	Baltimore	68.2%	344 of 504	25 min	2.3 h
450	IS 70 WB at South MountainMD064	82.2	Road	Frederick	68.2%	344 of 504	25 min	2.3 h
450	IS 68 W of 15 MI CreekMD076	82.2	Road	Allegany	68.2%	344 of 504	25 min	2.3 h
450	IS 695 W at Providence RdMD077	82.2	Road	Baltimore	68.2%	344 of 504	25 min	2.3 h
450	IS 83 SB at MD 439MD078	82.2	Road	Baltimore	68.2%	344 of 504	25 min	2.3 h
450	IS 95/495 I/L at MD 5MD079	82.2	Road	Prince Georges	68.2%	344 of 504	25 min	2.3 h
450	IS 695 O/L South of IS 95MD080	82.2	Road	Baltimore	68.2%	344 of 504	25 min	2.3 h
450	IS 70 West of US-29MD081	82.2	Road	Howard	68.2%	344 of 504	25 min	2.3 h
450	MD 295 N - South of IS 895MD082	82.2	Road	Anne Arundel	68.2%	344 of 504	25 min	2.3 h
450	IS 270 S - South of Middlebrook MD US MDDOTMD083	82.2	Road	Montgomery	68.2%	344 of 504	25 min	2.3 h
450	IS 270 N - North of MD 80MD084	82.2	Road	Frederick	68.2%	344 of 504	25 min	2.3 h
450	IS 83 N at Old Pimlico RoadMD086	82.2	Road	Baltimore	68.2%	344 of 504	25 min	2.3 h
450	US 50 East - 2 Mi prior to MD-32 MD US MDDOTMD088	82.2	Road	Talbot	68.2%	344 of 504	25 min	2.3 h
450	MD 140 S at Balt. Co LineMD090	82.2	Road	Carroll	68.2%	344 of 504	25 min	2.3 h
450	IS 695 IL past US 1MD091	82.2	Road	Baltimore	68.2%	344 of 504	25 min	2.3 h
450	IS 695 S 1.5mi N of IS 795MD092	82.2	Road	Baltimore	68.2%	344 of 504	25 min	2.3 h
450	US 50 E at Church RoadMD093	82.2	Road	Prince Georges	68.2%	344 of 504	25 min	2.3 h
450	IS 270 S prior to IS 495MD095	82.2	Road	Montgomery	68.2%	344 of 504	25 min	2.3 h
450	US 50 E - prior to MD 410MD096	82.2	Road	Prince Georges	68.2%	344 of 504	25 min	2.3 h
450	US 29 NB at MD 108MD097	82.2	Road	Howard	68.2%	344 of 504	25 min	2.3 h
450	MD 4 South at MD 235MD098	82.2	Road	St. Marys	68.2%	344 of 504	25 min	2.3 h
450	MD 5 North at MD 246MD100	82.2	Road	St. Marys	68.2%	344 of 504	25 min	2.3 h
450	US 50 E 3Mi W of I 97MD102	82.2	Road	Anne Arundel	68.2%	344 of 504	25 min	2.3 h
450	MD 404 E prior to MD 16MD104	82.2	Road	Caroline	68.2%	344 of 504	25 min	2.3 h
450	MD-135 at Meadow Oaks DriveMD107	82.2	Road	Garrett	68.2%	344 of 504	25 min	2.3 h
450	US-40 W at MD-132MD108	82.2	Road	Harford	68.2%	344 of 504	25 min	2.3 h
450	MD 22 E at Shucks RoadMD111	82.2	Road	Harford	68.2%	344 of 504	25 min	2.3 h
450	MD 222 N North of I-95MD113	82.2	Road	Cecil	68.2%	344 of 504	25 min	2.3 h
450	US 40 West of Mechanics Valley R MD US MDDOTMD114	82.2	Road	Cecil	68.2%	344 of 504	25 min	2.3 h
450	US 50 East past MD-347MD115	82.2	Road	Wicomico	68.2%	344 of 504	25 min	2.3 h
450	US-50 WB at Friendship RoadMD116	82.2	Road	Wicomico	68.2%	344 of 504	25 min	2.3 h
450	MD-10 NB S of N Thompson Avenue MD US MDDOTMD117	82.2	Road	Anne Arundel	68.2%	344 of 504	25 min	2.3 h
450	IS 97 N prior to Hawkins RoadMD118	82.2	Road	Anne Arundel	68.2%	344 of 504	25 min	2.3 h
450	IS 68 EB E of Ex 19 MD-495MD119	82.2	Road	Garrett	68.2%	344 of 504	25 min	2.3 h
450	US 50E at MD 331MD121	82.2	Road	Talbot	68.2%	344 of 504	25 min	2.3 h
450	MD 404 E - East of Newtown Road MD US MDDOTMD123	82.2	Road	Talbot	68.2%	344 of 504	25 min	2.3 h
450	I-95 / 495 NB past MD 201MD125	82.2	Road	Prince Georges	68.2%	344 of 504	25 min	2.3 h
450	US 13 NB at MD 12MD127	82.2	Road	Wicomico	68.2%	344 of 504	25 min	2.3 h
450	I-495 I/L prior to MD 650MD128	82.2	Road	Montgomery	68.2%	344 of 504	25 min	2.3 h
450	US-15 SB at St. Anthony RoadMD130	82.2	Road	Frederick	68.2%	344 of 504	25 min	2.3 h
450	IS 70 WB at Mt. Phillip RoadMD131	82.2	Road	Frederick	68.2%	344 of 504	25 min	2.3 h
450	IS 70 WB at MD-66MD132	82.2	Road	Washington	68.2%	344 of 504	25 min	2.3 h
450	IS 81 SB at Showalter RoadMD133	82.2	Road	Washington	68.2%	344 of 504	25 min	2.3 h
450	IS 70 WB at MD-68MD134	82.2	Road	Washington	68.2%	344 of 504	25 min	2.3 h

How a station is ranked

The 247 Rank answers one question about a weather station: can its readings be relied on? A station has to deliver: its reports arrive when due, soon, without long silences. And its readings have to be right: close to a trusted station nearby, passing their checks, and in step with the weather the forecast and its neighbours confirm.

The 247 score

Storm Station's poller asks every network on its own schedule, around the clock, and keeps the time of every report it hears; the reference comparison and the forecast engine keep the rest. From the last seven days of that record each station is scored out of 100 on six parts, and its 247 score is their weighted mean:

Reports receivedweight 35The share of its scheduled reports received. A station that sends every 5 minutes is due 2,016 reports in a week; one that reports once a day is due 7. Each report is counted in a slot centred on the station's own report time, so a report a minute early or late is still on time, and the week ends an hour back, so a report still on its way is never counted missed.Full marks: 100% received. No marks: none received.
Arrivalweight 10The median time its reports took to arrive from the moment a reading was taken to the moment it reached Storm Station.Full marks: within 10 minutes, or a tenth of its schedule for a station that reports less often. No marks: an hour, or its whole schedule.
Continuityweight 10Its longest silence against its own schedule, so a daily gauge is not marked down for a day between reports.Full marks: a silence of 3 reports or less. No marks: 72 reports, falling evenly on a log scale between.
Accuracyweight 20How closely its temperature follows its reference station the nearest airport or climate reference station that reported within half an hour, up to 15 miles away, reading by reading; an airfield is compared with the nearest other airport, never its own report. A steady offset is taken out, and where both heights are known only the offset beyond 3 F that the height difference does not explain is counted.Full marks: within 1.5 F, allowing 0.1 F more for each mile to the reference. No marks: 6.5 F beyond that.
Instrument checksweight 15The share of its readings that pass a check. For an airfield, the check the forecast engine runs the next day: each reading against the stations around it, as weather services check their own. For any other station, a reading 20 F or more from its reference fails, unless the two stand 3,000 ft or more apart.Full marks: none failed. No marks: 5% failed.
Forecast checkweight 10How closely its temperature matched Storm Station's forecast for the same hours, checked the next day, for every airfield the forecast engine scores. A station whose readings stray far from a forecast its neighbours confirm is one to doubt.Full marks: within 2 F on average. No marks: 8 F.

A part is scored once the week holds 24 readings or comparisons for it. A part that cannot be measured where a station stands counts at the middle of its state's measured stations, so the station is neither lifted nor sunk by it. A part measured nowhere in the state is left out, and the others carry its weight.

From score to rank

Each state's stations are ranked by their score, to the tenth. At an equal score the longer record comes first: a station that sent 2,016 of 2,016 reports has shown more than one that sent 7 of 7. Then the faster arrival, then the shorter silence. Ties on all of them share a rank, as a race is scored: three stations tied for third are all third, and the next is sixth.

A station is ranked once its week holds enough reports to measure: 12, or 3 days for a gauge that reports once a day. The rank is made again every day, so a station that falls silent or starts to read wrong drops, and one that recovers climbs back. Every page shows the same ranking: a station's rank here, in its state's list and on its own page come from one run, and a new run reaches them together. Each station's page shows its score part by part, with the figures behind each.

The same figures as data

/api/ranks for a state and /api/rank for one station, its score in parts; the developer page has every field.