Madison County weather, town by town
13 places in Madison County, Montana, 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.
Madison County Weather Facts
Madison County has 13 places on myweatherrock (9 census-designated places, 4 towns), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 103°F at Virginia City on July 25, 1919. The coldest night is -43°F at Ennis on January 17, 1930. The wettest day brought 5.04 inches of rain at Norris Madison Pwr House on May 24, 1909. The biggest single-day snow measured 24.02 inches at Norris Madison Pwr House on May 7, 1965. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is McAllister, about 2 square miles.
About Madison County weather
The map on the Now tab shows every Madison 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 13 Madison County towns with station normals, the warmest month is July, when the day usually reaches 80°F, and the coldest is December, when the night usually falls to 15°F. May is the wettest, with rain on about 13 days. July afternoons run from about 69°F in Harrison to 85°F in McAllister. December nights run from about 12°F in Brandon to 23°F in McAllister.
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.
Madison 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 Madison County weather
- What is the hottest temperature recorded at a Madison County station?
- 103°F at Virginia City on July 25, 1919, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Madison County station?
- -43°F at Ennis on January 17, 1930.
- What is the most rain a Madison County station has measured in one day?
- 5.04 inches at Norris Madison Pwr House on May 24, 1909.
- What is the biggest one-day snowfall at a Madison County station?
- 24.02 inches at Norris Madison Pwr House on May 7, 1965.
- How many Madison County towns have a weather page here?
- 13: 9 census-designated places, 4 towns. 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 Madison 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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