National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Tracking Winter Weather and Frigid Temperatures Through This Weekend

A clipper storm will move across the Great Lakes through this weekend with periods of light snow, gusty winds, and lake effect snow bands which could make for hazardous travel at times. A frigid airmass will spread eastward behind this storm into the Midwest and Eastern U.S. through the weekend. Read More >

Hazardous Weather Conditions

Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Overcast

16°F

-9°C

Humidity 73%
Wind Speed NW 8 mph
Barometer 30.03 in (1018.9 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill5°F (-15°C)
Last update 17 Jan 5:55 pm CST
Extended Forecast for

2 Miles N Ontario WI

Cold Weather Advisory January 19, 03:00am until January 19, 12:00pm
Click here for hazard details and duration
Cold Weather Advisory

  • Tonight

    Tonight: A 20 percent chance of snow before 7pm. Cloudy, with a low around 3. Wind chill values as low as -11. Northwest wind 8 to 14 mph, with gusts as high as 25 mph.

    Low: 3 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Sunday

    Sunday: Snow, mainly after noon. High near 17. Wind chill values as low as -9. Southwest wind 8 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New snow accumulation of around an inch possible.

    High: 17 °F

    Chance Snow
    then Snow

  • Sunday Night

    Sunday Night: A 50 percent chance of snow, mainly before 9pm. Mostly cloudy, with a low around -6. Wind chill values as low as -26. Blustery, with a northwest wind 8 to 18 mph, with gusts as high as 34 mph. New snow accumulation of less than a half inch possible.

    Low: -6 °F

    Blustery.
    Chance Snow
    then Mostly
    Cloudy

  • M.L.King Day

    M.L.King Day: Partly sunny and cold, with a high near 4. Wind chill values as low as -27. Blustery, with a northwest wind 8 to 17 mph, with gusts as high as 32 mph.

    High: 4 °F

    Partly Sunny
    and Blustery
    then Partly
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around -5. West wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 20 mph.

    Low: -5 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 17. Calm wind becoming southwest around 6 mph.

    High: 17 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 9. Calm wind becoming west around 5 mph after midnight.

    Low: 9 °F

    Chance Snow

  • Wednesday

    Wednesday: A 30 percent chance of snow. Mostly cloudy, with a high near 20. West wind 6 to 11 mph, with gusts as high as 21 mph.

    High: 20 °F

    Chance Snow

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 1. West wind 5 to 8 mph, with gusts as high as 21 mph.

    Low: 1 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of snow before 7pm. Cloudy, with a low around 3. Wind chill values as low as -11. Northwest wind 8 to 14 mph, with gusts as high as 25 mph.
Sunday
Snow, mainly after noon. High near 17. Wind chill values as low as -9. Southwest wind 8 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New snow accumulation of around an inch possible.
Sunday Night
A 50 percent chance of snow, mainly before 9pm. Mostly cloudy, with a low around -6. Wind chill values as low as -26. Blustery, with a northwest wind 8 to 18 mph, with gusts as high as 34 mph. New snow accumulation of less than a half inch possible.
M.L.King Day
Partly sunny and cold, with a high near 4. Wind chill values as low as -27. Blustery, with a northwest wind 8 to 17 mph, with gusts as high as 32 mph.
Monday Night
Partly cloudy, with a low around -5. West wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 20 mph.
Tuesday
Mostly sunny, with a high near 17. Calm wind becoming southwest around 6 mph.
Tuesday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 9. Calm wind becoming west around 5 mph after midnight.
Wednesday
A 30 percent chance of snow. Mostly cloudy, with a high near 20. West wind 6 to 11 mph, with gusts as high as 21 mph.
Wednesday Night
Mostly cloudy, with a low around 1. West wind 5 to 8 mph, with gusts as high as 21 mph.
Thursday
Mostly sunny, with a high near 16. West wind 5 to 8 mph.
Thursday Night
Mostly cloudy, with a low around 4. Light west wind.
Friday
Partly sunny, with a high near 17. Northwest wind 3 to 7 mph.
Friday Night
Mostly cloudy, with a low around -6. North wind 3 to 5 mph.
Saturday
A 20 percent chance of snow. Partly sunny, with a high near 8. North wind 3 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N Ontario WI
 43.75°N 90.58°W
Last Update:
3:21 pm CST Jan 17, 2026
Forecast Valid:
6pm CST Jan 17, 2026-6pm CST Jan 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation