Summit County weather, town by town
9 places in Summit County, Colorado, each with its own live forecast and radar, and where a station sits close enough, measured weather records.
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Measured at the NOAA stations serving these towns, daily records 1893 to 2026. Station extremes, not official state records.
Summit County Weather Facts
Summit County has 9 places on myweatherrock (6 towns, 3 census-designated places), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 99°F at Williams Fk Dam on August 8, 2026. The coldest night is -46°F at Dillon 1 E on December 24, 1924. The wettest day brought 3.5 inches of rain at Grizzly Peak on April 6, 1982. The biggest single-day snow measured 30.98 inches at Climax on April 24, 2003. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is Keystone, about 41 square miles.
About Summit County weather
The map on the Now tab shows every Summit County town's current temperature from our own server, one dot per town. Tap any dot, or type a town above, for that town's full forecast.
What the weather is usually like
Across the 9 Summit County towns with station normals, the warmest month is July, when the day usually reaches 72°F, and the coldest is January, when the night usually falls to 4°F. April is the wettest, with rain on about 13 days. July afternoons run from about 66°F in Blue River to 80°F in Heeney. January nights run from about -1°F in Heeney to 13°F in Montezuma.
Means of the 1991 to 2020 station normals serving these towns, as published by NOAA; each town's page carries its own.
Where these numbers come from
- Current conditions and forecast: NOAA forecast grids decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
- Records: computed by myweatherrock from NOAA GHCN-Daily station records at the stations serving these towns. Measurements, not estimates.
- Warnings and alerts: the National Weather Service, passed through unchanged.
Summit County weather records
Measured at the NOAA stations serving these towns, daily records 1893 to 2026. Station extremes, not official state records.
Common questions about Summit County weather
- What is the hottest temperature recorded at a Summit County station?
- 99°F at Williams Fk Dam on August 8, 2026, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Summit County station?
- -46°F at Dillon 1 E on December 24, 1924.
- What is the most rain a Summit County station has measured in one day?
- 3.5 inches at Grizzly Peak on April 6, 1982.
- What is the biggest one-day snowfall at a Summit County station?
- 30.98 inches at Climax on April 24, 2003.
- How many Summit County towns have a weather page here?
- 9: 6 towns, 3 census-designated places. Each page carries current conditions, the hourly timeline, the ten day outlook, radar, and where a station sits close enough, measured records.
- Where does the Summit County forecast come from?
- NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
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