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Johnstown, Wyoming

Community in Fremont County, Wyoming

Air quality

The air at Johnstown

Index 11, good, led by coarse particles. Read at 11 PM from its reporting area, Riverton (WY), 17 miles off.

11Good
  • Fine particles (PM2.5)1Good-
  • Coarse particles (PM10)11Good-

The days ahead

Yesterday measured 12, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 6 PM.

FriSat

Precipitation

What has fallen at Johnstown

None in the last 24 hours; 0.07 in over the last 3 days, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.07in

Visibility

How far you can see at Johnstown, the next 43 hours

Visibility stays 7 miles or more through Sat 6 PM, lowest 7 miles Sat 9 AM.

FriSat

On the radar over Johnstown, WyomingReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Johnstown, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 5.3 miles away.

measured now5 instruments

RivertonRIW

At an airfield/12.3 mi away/5,538 ft/16 ft above here

temp, wind, gust, visibility, precip, pressure

Rank810of 971

Lander 11 SSE94078

At a climate reference station/31.9 mi away/5,773 ft/251 ft above here

temp, humidity, wind, solar, precip

Rank607of 971

measured daily2 instruments

Riverton 17.8 NWWY-FM-98

In a volunteer observer's own ground/5.3 mi away/5,393 ft/129 ft below here

precip, snowfall, snow depth

Rank-

Pavillion - COOPPVLW4

At a cooperative observer's station/7.9 mi away/5,453 ft/69 ft below here

snowfall, snow depth, precip, high, low

Rank915of 971

Station report

The weather at Riverton, drawn

The nearest airport reporting now, 12.3 mi from Johnstown, Wyoming. From its report of Oct 15, 2026, 10:53 PM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Riverton, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RIWFIG. A THE SKY OVER RIVERTONSECTION, HEIGHT ABOVE THE STATION TO SCALE, EACH LAYER AT THE HEIGHT OF ITS BASE AS REPORTED; COVER IN EIGHTHS OF THE SKY; TOPS NOT MEASUREDFT ABOVE THE STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLERiverton, the skySTATION REPORT · ASOS RIWTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-RIW-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

39.0 F with a dew point of 31.0 F, 73 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,800 ft up.

Chart of the air at Riverton: temperature 39.0 degrees Fahrenheit and dew point 31.0, 73 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,800 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RIWFIG. B THE AIR AT RIVERTONTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00020 F30 F40 F50 FSATURATES 1,800 FT ABOVE THE STATION, AT 29.3 FTEMPERATURE 39.0 FDEW POINT 31.0 FSPREAD 8.0 FRELATIVE HUMIDITY 73 PER CENTTHE AIR COOLS ABOUT 5.4 F EACH 1,000 FT IT RISES, AND ITS DEW POINT ABOUT 1 FSOLID: THE LIFTED AIR'S TEMPERATURE; DASHED: ITS DEW POINTTITLERiverton, the airSTATION REPORT · ASOS RIWTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-RIW-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southwest (200 degrees) at 5 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 40 mph.

Plan of the wind at Riverton, north up: blowing from 200 degrees, the south southwest, at 5 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RIWFIG. C THE WIND AT RIVERTONPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 200°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLERiverton, the windSTATION REPORT · ASOS RIWTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-RIW-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Riverton, in 6 sheets, each beside the Field Book plates that explain it

-

Snow on the ground

Elsewhere in Wyoming

20 places, each with its own forecast and its own instruments.

Near Johnstown

The nearest places, each with its own forecast and the instruments nearest it.

Near Johnstown

River and lake gauges