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

Heavy Lake Effect Snow; Subfreezing Temperatures in the Eastern U.S.

A multi-day heavy lake effect snow event is expected downwind of Lakes Erie and Ontario through New Year's Day. The Arctic front will continue to bring increasing winds to the Northeast that will remain gusty. Subfreezing overnight low temperatures will be found as far south as the Gulf Coast. Read More >

Hazardous Weather Conditions

Current conditions at

Granby-Grand County Airport (KGNB)

Lat: 40.09°NLon: 105.92°WElev: 8207ft.

Fair

5°F

-15°C

Humidity 81%
Wind Speed SE 5 mph
Barometer 30.60 in
Dewpoint 1°F (-17°C)
Visibility 10.00 mi
Wind Chill-5°F (-21°C)
Last update 29 Dec 11:35 pm MST
Extended Forecast for

2 Miles NW Saint Marys Glacier CO

  • Tonight

    Tonight: Clear, with a low around 9. Wind chill values as low as -9. Breezy, with a west wind 18 to 21 mph, with gusts as high as 33 mph.

    Low: 9 °F

    Clear and
    Breezy

  • Tuesday

    Tuesday: Sunny, with a high near 26. Wind chill values as low as -8. Breezy, with a west wind 15 to 22 mph, with gusts as high as 34 mph.

    High: 26 °F

    Sunny and
    Breezy

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 17. Wind chill values as low as zero. Breezy, with a west wind 16 to 22 mph, with gusts as high as 36 mph.

    Low: 17 °F

    Mostly Clear
    and Breezy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 32. Wind chill values as low as zero. Breezy, with a west wind 16 to 22 mph, with gusts as high as 34 mph.

    High: 32 °F

    Mostly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 21. Breezy, with a west wind 18 to 22 mph, with gusts as high as 34 mph.

    Low: 21 °F

    Mostly Cloudy
    and Breezy

  • New Year's Day

    New Year's Day: A 50 percent chance of snow, mainly after 11am. Cloudy, with a high near 30. Breezy.

    High: 30 °F

    Chance Snow
    and Breezy

  • Thursday Night

    Thursday Night: Snow likely. Mostly cloudy, with a low around 22. Breezy. Chance of precipitation is 60%.

    Low: 22 °F

    Snow Likely
    and Breezy

  • Friday

    Friday: Snow likely, mainly before 11am. Mostly cloudy, with a high near 27. Breezy.

    High: 27 °F

    Snow Likely
    and Breezy

  • Friday Night

    Friday Night: A slight chance of snow before 11pm. Mostly cloudy, with a low around 19. Breezy.

    Low: 19 °F

    Breezy.
    Slight Chance
    Snow then
    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 9. Wind chill values as low as -9. Breezy, with a west wind 18 to 21 mph, with gusts as high as 33 mph.
Tuesday
Sunny, with a high near 26. Wind chill values as low as -8. Breezy, with a west wind 15 to 22 mph, with gusts as high as 34 mph.
Tuesday Night
Mostly clear, with a low around 17. Wind chill values as low as zero. Breezy, with a west wind 16 to 22 mph, with gusts as high as 36 mph.
Wednesday
Mostly sunny, with a high near 32. Wind chill values as low as zero. Breezy, with a west wind 16 to 22 mph, with gusts as high as 34 mph.
Wednesday Night
Mostly cloudy, with a low around 21. Breezy, with a west wind 18 to 22 mph, with gusts as high as 34 mph.
New Year's Day
A 50 percent chance of snow, mainly after 11am. Cloudy, with a high near 30. Breezy.
Thursday Night
Snow likely. Mostly cloudy, with a low around 22. Breezy. Chance of precipitation is 60%.
Friday
Snow likely, mainly before 11am. Mostly cloudy, with a high near 27. Breezy.
Friday Night
A slight chance of snow before 11pm. Mostly cloudy, with a low around 19. Breezy.
Saturday
A slight chance of snow after 11am. Mostly sunny, with a high near 30. Breezy.
Saturday Night
A slight chance of snow. Partly cloudy, with a low around 18. Breezy.
Sunday
A chance of snow. Partly sunny, with a high near 28. Breezy.
Sunday Night
A chance of snow. Partly cloudy, with a low around 15. Breezy.
Monday
A chance of snow. Partly sunny, with a high near 24. Breezy.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NW Saint Marys Glacier CO
 39.87°N 105.66°W (Elev. 10620 ft)
Last Update:
2:01 pm MST Dec 29, 2025
Forecast Valid:
11pm MST Dec 29, 2025-6pm MST Jan 5, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation