DeKalb County weather, town by town
12 places in DeKalb 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 1966 to 2026. Station extremes, not official state records.
DeKalb County Weather Facts
DeKalb County has 12 places on myweatherrock (7 villages, 4 cities, 1 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 De Kalb on August 17, 1988. The coldest night is -33°F at Chicago Aurora Muni Ap on January 16, 2009. The wettest day brought 8.09 inches of rain at De Kalb on July 18, 1996. The biggest single-day snow measured 17.09 inches at Genoa 2Sw on February 2, 2011. Those are station measurements from NOAA's daily records, 1966 to 2026, not official state records. By area the largest place is DeKalb, about 18 square miles.
About DeKalb County weather
The map on the Now tab shows every DeKalb 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 12 DeKalb 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.
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.
DeKalb County weather records
Measured at the NOAA stations serving these towns, daily records 1966 to 2026. Station extremes, not official state records.
Common questions about DeKalb County weather
- What is the hottest temperature recorded at a DeKalb County station?
- 103°F at De Kalb on August 17, 1988, in the NOAA daily station records myweatherrock holds (1966 to 2026).
- What is the coldest temperature recorded at a DeKalb County station?
- -33°F at Chicago Aurora Muni Ap on January 16, 2009.
- What is the most rain a DeKalb County station has measured in one day?
- 8.09 inches at De Kalb on July 18, 1996.
- What is the biggest one-day snowfall at a DeKalb County station?
- 17.09 inches at Genoa 2Sw on February 2, 2011.
- How many DeKalb County towns have a weather page here?
- 12: 7 villages, 4 cities, 1 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 DeKalb 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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