Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Fair

-2°F

-19°C

Humidity 77%
Wind Speed SW 6 mph
Barometer 30.30 in
Dewpoint -8°F (-22°C)
Visibility 10.00 mi
Wind Chill-14°F (-26°C)
Last update 20 Jan 3:35 am CST
Extended Forecast for

7 Miles WSW Fort Atkinson WI

Winter Weather Advisory January 20, 09:00pm until January 21, 06:00am
Click here for hazard details and duration
Winter Weather Advisory
  • Overnight

    Overnight: Clear, with a low around -5. Wind chill values between -15 and -20. West wind around 5 mph.

    Low: -5 °F

    Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 15. Wind chill values between -10 and -20. West wind 5 to 10 mph.

    High: 15 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Snow, mainly after 10pm. The snow could be heavy at times.  Low around 12. South wind around 5 mph.  Chance of precipitation is 100%. New snow accumulation of 3 to 5 inches possible.

    Low: 12 °F

    Heavy Snow

  • Wednesday

    Wednesday: A 20 percent chance of snow before 9am.  Mostly cloudy, with a high near 24. West wind 5 to 15 mph.

    High: 24 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Snow showers likely before midnight.  Mostly cloudy, with a low around 5. West wind around 15 mph, with gusts as high as 30 mph.  Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    Low: 5 °F

    Snow Showers
    Likely then
    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 15. West wind 10 to 15 mph.

    High: 15 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -14. Northwest wind around 10 mph.

    Low: -14 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and cold, with a high near -4. Northwest wind 5 to 10 mph.

    High: -4 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around -16.

    Low: -16 °F

    Partly Cloudy

Detailed Forecast

Overnight
Clear, with a low around -5. Wind chill values between -15 and -20. West wind around 5 mph.
Tuesday
Increasing clouds, with a high near 15. Wind chill values between -10 and -20. West wind 5 to 10 mph.
Tuesday Night
Snow, mainly after 10pm. The snow could be heavy at times. Low around 12. South wind around 5 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 5 inches possible.
Wednesday
A 20 percent chance of snow before 9am. Mostly cloudy, with a high near 24. West wind 5 to 15 mph.
Wednesday Night
Snow showers likely before midnight. Mostly cloudy, with a low around 5. West wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Thursday
Mostly sunny, with a high near 15. West wind 10 to 15 mph.
Thursday Night
Partly cloudy, with a low around -14. Northwest wind around 10 mph.
Friday
Mostly sunny and cold, with a high near -4. Northwest wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around -16.
Saturday
A 20 percent chance of snow after noon. Partly sunny and cold, with a high near 0.
Saturday Night
A 30 percent chance of snow. Mostly cloudy, with a low around -9.
Sunday
A 20 percent chance of snow. Mostly sunny, with a high near 12.
Sunday Night
Partly cloudy, with a low around -6.
Monday
Mostly sunny, with a high near 13.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
7 Miles WSW Fort Atkinson WI
 42.88°N 88.96°W (Elev. 774 ft)
3:06 am CST Jan 20, 2026
3am CST Jan 20, 2026-6pm CST Jan 26, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database