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 >

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Fair

0°F

-18°C

Humidity 78%
Wind Speed SW 7 mph
Barometer 30.29 in
Dewpoint -6°F (-21°C)
Visibility 10.00 mi
Wind Chill-13°F (-25°C)
Last update 20 Jan 12:35 am CST
Extended Forecast for

4 Miles WNW Beloit WI

  • Overnight

    Overnight: Mostly clear, with a low around -3. Wind chill values between -10 and -15. West wind around 5 mph.

    Low: -3 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 16. Wind chill values between -5 and -15. West wind 5 to 10 mph.

    High: 16 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Snow, mainly after 8pm.  Temperature falling to near 13 by 8pm, then rising to around 21 during the remainder of the night. South wind around 5 mph becoming west after midnight.  Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.

    Low: 13 °F

    Snow

  • Wednesday

    Wednesday: A 20 percent chance of snow before noon.  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: A 50 percent chance of snow before midnight.  Mostly cloudy, with a low around 6. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 6 °F

    Breezy.
    Chance Snow
    then Partly
    Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 16. West wind around 15 mph.

    High: 16 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -12. Northwest wind 10 to 15 mph.

    Low: -12 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and cold, with a high near -4. Northwest wind 10 to 15 mph.

    High: -4 °F

    Cold

  • Friday Night

    Friday Night: Mostly cloudy, with a low around -17.

    Low: -17 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around -3. Wind chill values between -10 and -15. West wind around 5 mph.
Tuesday
Increasing clouds, with a high near 16. Wind chill values between -5 and -15. West wind 5 to 10 mph.
Tuesday Night
Snow, mainly after 8pm. Temperature falling to near 13 by 8pm, then rising to around 21 during the remainder of the night. South wind around 5 mph becoming west after midnight. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.
Wednesday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 24. West wind 5 to 15 mph.
Wednesday Night
A 50 percent chance of snow before midnight. Mostly cloudy, with a low around 6. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph.
Thursday
Mostly sunny, with a high near 16. West wind around 15 mph.
Thursday Night
Partly cloudy, with a low around -12. Northwest wind 10 to 15 mph.
Friday
Mostly sunny and cold, with a high near -4. Northwest wind 10 to 15 mph.
Friday Night
Mostly cloudy, with a low around -17.
Saturday
Mostly sunny and cold, with a high near -1.
Saturday Night
A 20 percent chance of snow. Mostly cloudy, with a low around -13.
Sunday
Mostly sunny and cold, with a high near 8.
Sunday Night
Partly cloudy, with a low around -3.
Monday
Mostly sunny, with a high near 15.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Beloit WI
 42.54°N 89.1°W (Elev. 889 ft)
12:21 am CST Jan 20, 2026
12am 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