Boone County weather, town by town
8 places in Boone County, Illinois, 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.
Boone County Weather Facts
Boone County has 8 places on myweatherrock (4 villages, 3 census-designated places, 1 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 110°F at Beloit on July 14, 1936. The coldest night is -31°F at Rockford Gtr Rockford Ap on January 31, 2019. The wettest day brought 7.07 inches of rain at Belvidere Wwtp on August 22, 2002. The biggest single-day snow measured 15.98 inches at Harvard Wwtp on February 2, 2011. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is Belvidere, about 13 square miles.
About Boone County weather
The map on the Now tab shows every Boone 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 8 Boone County towns with station normals, the warmest month is July, when the day usually reaches 83°F, and the coldest is January, when the night usually falls to 13°F. May is the wettest, with rain on about 13 days. January nights run from about 11°F in Capron to 14°F in Belvidere.
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.
Boone 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 Boone County weather
- What is the hottest temperature recorded at a Boone County station?
- 110°F at Beloit on July 14, 1936, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Boone County station?
- -31°F at Rockford Gtr Rockford Ap on January 31, 2019.
- What is the most rain a Boone County station has measured in one day?
- 7.07 inches at Belvidere Wwtp on August 22, 2002.
- What is the biggest one-day snowfall at a Boone County station?
- 15.98 inches at Harvard Wwtp on February 2, 2011.
- How many Boone County towns have a weather page here?
- 8: 4 villages, 3 census-designated places, 1 cities. 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 Boone 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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