Lake Koshkonong Near Newville05427235
At a river or reservoir gauge/3.0 mi away/770 ft/9 ft below here
temp, wind, gust, humidity, pressure
Lake Koshkonong, Wisconsin
Community in Jefferson County, Wisconsin* WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Portions of east central, south central, and southeast Wisconsin. * WHEN...From 1 AM to 9 AM CDT Saturday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Take steps now to protect tender plants from the cold.
46°
54°/44°
Overcast·
Feels like 40°·Gentle breeze 13 mph WNW
Alert. A Freeze Warning is in force for Lake Koshkonong until 9 AM tomorrow. Read the alert in full, and see what it means in the Field Book.
Now. Lake Koshkonong is 46° and overcast at 6 AM. With the wind it feels like 40°. The dew point is 45°, so the air feels dry and comfortable. Gentle breeze from the west-northwest at 13 mph, gusting to 26 mph.
Today and tonight. It warms to about 53° by 3 PM. Tonight falls to about 31° by 7 AM, under a mostly clear sky. A freeze: protect plants and pipes. No rain is expected for the rest of the day.
The week. The warmest day ahead is Thursday, near 72°, and the coolest tomorrow, near 57°. The days ahead look dry. The first freeze could come tomorrow, a low of 30°.
The sky tonight. The sun sets at 6:12 PM. The Moon is a waxing crescent, 33% lit, and sets at 9:59 PM. The next full Moon is Sunday, Oct 25. After dark, look for Saturn, bright in the east-southeast. A planet shines with a steady light where the stars around it twinkle. The Orionids meteor shower is active, peaking around Oct 21: at its peak, up to about 20 meteors an hour can be seen from a dark site. The sky is forecast to stay clear: a good night to look up. The day is 11 hours 3 minutes long, 3 minutes shorter than yesterday.
0UV Low
19Air quality
90%Humidity
98%Cloud
Now
6:00 AM
46feels40
13mph
Today
Oct 16
5444
27%
19mph
Sat
Oct 17
5730
clear day
Sun
Oct 18
6237
15mph
Mon
Oct 19
6638
overcast
Tue
Oct 20
6940
overcast
Wed
Oct 21
7143
overcast
Thu
Oct 22
7248
12%
46°
54°44°
57°30°
62°37°
66°38°
69°40°
71°43°
72°48°
As of 6:00 AM in Lake Koshkonong, Wisconsin.
Air quality
The air at Lake Koshkonong
Index 19, good, led by ozone. Read at 6 AM from its reporting area, Kettle Moraine South (WI), 13 miles off.
19Good
- Fine particles (PM2.5)7Good-
- Ozone19Good15 ppb9.1 mi
- Coarse particles (PM10)3Good-
The days ahead
Good each day through Sat Oct 17, led by ozone. Yesterday measured 23, good.
GoodModerate
- 23YesterdayOct 15
- GoodTodayOct 16
- GoodSatOct 17
Smoke, the next 44 hours
No smoke near the ground through Sun 1 AM.
Precipitation
What has fallen at Lake Koshkonong
0.62 in in the last 24 hours, 0.75 in over the last 3 days, to Fri 5 AM. Measured by radar and rain gauges, as water.
- Last 24 hours
- 0.62in
- Last 3 days
- 0.75in
3 days agoLast 24 hours 83%
Visibility
How far you can see at Lake Koshkonong, the next 44 hours
Visibility stays 9 miles or more through Sun 1 AM, lowest 9 miles Fri 8 AM.
F
Now, today, and the week
On the radar over Lake Koshkonong, WisconsinReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture
Weather instrument stations by state
What is measuring near here
The 6 instruments nearest Lake Koshkonong, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.3 miles away.
measured now4 instruments
Rank543of 1,313
I-39 / 90 at STH 59 NewvilleWI088
Beside a road/7.5 mi away/869 ft/90 ft above here
temp, pavement temp, wind, visibility, precip
In a volunteer observer's own ground/13.0 mi away/877 ft/98 ft above here
temp, humidity, wind, precip, pressure
At an airfield/19.7 mi away/807 ft/28 ft above here
temp, wind, gust, visibility, precip, pressure
measured daily2 instruments
Fort Atkinson 2SWFTAW3
At a cooperative observer's station/2.3 mi away/794 ft/15 ft above here
snowfall, snow depth, precip, high, low
Fort Atkinson 4.3 WWI-JF-40
In a volunteer observer's own ground/3.3 mi away/884 ft/105 ft above here
precip, snowfall, snow depth
Station report
The weather at Janesville/Rock, drawn
The nearest airport reporting now, 19.7 mi from Lake Koshkonong, Wisconsin. From its report of Oct 16, 2026, 5:45 AM local time: 3 of its 6 sheets.
The sky
Overcast at 2,000 ft; the ceiling is 2,000 ft; visibility 10 mi or more.
The air
48.2 F with a dew point of 44.6 F, 87 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 800 ft up; the lowest cloud reported is at 2,000 ft.
The wind
From the west (280 degrees) at 13 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 26 mph.
The full report of Janesville/Rock, in 6 sheets, each beside the Field Book plates that explain it
What the snow tracker reads here
Every instrument in this state
-
Snow on the ground
Elsewhere in Wisconsin
19 places, each with its own forecast and its own instruments.
Near Lake Koshkonong
The nearest places, each with its own forecast and the instruments nearest it.
- Fort Atkinsoncity, 4 mi
- Miltoncity, 8 mi
- Whitewatercity, 8 mi
- Rockdalevillage, 9 mi
- Jeffersoncity, 9 mi
- Edgertoncity, 10 mi
- Lake Ripleycommunity, 10 mi
- Cambridgevillage, 11 mi
- Hebroncommunity, 11 mi
- Fultoncommunity, 13 mi
- Lake Lorrainecommunity, 13 mi
- Helenvillecommunity, 14 mi