Clark County weather, town by town
5 places in Clark 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.
Clark County Weather Facts
Clark County has 5 places on myweatherrock (3 cities, 1 census-designated places, 1 villages), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 110°F at Charleston on July 14, 1936. The coldest night is -27°F at Charleston on January 19, 1994. The wettest day brought 7.2 inches of rain at Hutsonville on June 7, 2008. The biggest single-day snow measured 12.52 inches at Casey on February 21, 1912. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is Marshall, about 4 square miles.
About Clark County weather
The map on the Now tab shows every Clark 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 5 Clark County towns with station normals, the warmest month is July, when the day usually reaches 87°F, and the coldest is January, when the night usually falls to 20°F. May is the wettest, with rain on about 12 days. July afternoons run from about 85°F in Marshall to 88°F in Casey.
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.
Clark 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 Clark County weather
- What is the hottest temperature recorded at a Clark County station?
- 110°F at Charleston on July 14, 1936, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Clark County station?
- -27°F at Charleston on January 19, 1994.
- What is the most rain a Clark County station has measured in one day?
- 7.2 inches at Hutsonville on June 7, 2008.
- What is the biggest one-day snowfall at a Clark County station?
- 12.52 inches at Casey on February 21, 1912.
- How many Clark County towns have a weather page here?
- 5: 3 cities, 1 census-designated places, 1 villages. 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 Clark 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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