Jasper County weather, town by town
13 places in Jasper County, Iowa, 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.
Jasper County Weather Facts
Jasper County has 13 places on myweatherrock (13 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 107°F at Grinnell 3 Sw on August 5, 1918. The coldest night is -35°F at Grinnell 3 Sw on February 3, 1996. The wettest day brought 6.92 inches of rain at Grinnell 3 Sw on August 5, 1970. The biggest single-day snow measured 15.59 inches at Pella 1S on February 26, 1912. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is Newton, about 11 square miles.
About Jasper County weather
The map on the Now tab shows every Jasper 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 Jasper County towns with station normals, the warmest month is July, when the day usually reaches 84°F, and the coldest is January, when the night usually falls to 11°F. May is the wettest, with rain on about 12 days. January nights run from about 10°F in Lynnville to 13°F in Colfax.
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.
Jasper 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 Jasper County weather
- What is the hottest temperature recorded at a Jasper County station?
- 107°F at Grinnell 3 Sw on August 5, 1918, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Jasper County station?
- -35°F at Grinnell 3 Sw on February 3, 1996.
- What is the most rain a Jasper County station has measured in one day?
- 6.92 inches at Grinnell 3 Sw on August 5, 1970.
- What is the biggest one-day snowfall at a Jasper County station?
- 15.59 inches at Pella 1S on February 26, 1912.
- How many Jasper County towns have a weather page here?
- 13: 13 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 Jasper 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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