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Weather in Simpson, IL · National Weather Service + NOAA

Simpson has milder winters than most of Illinois

Simpson has chilly winters and warm summers, with plenty of rain. A typical July afternoon reaches 88°, a January night drops to 26°, and about 7 inches of snow falls in a normal winter. In November, a normal day reaches 56° and a normal night drops to 36°.

Winter 45°/28°Spring 68°/46°Summer 87°/66°Fall 69°/47°
Right now
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Sunrise 7:21 am · sunset 5:56 pm

Getting the latest forecast from the National Weather Service…

What stands out about Simpson’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Milder winters than most of IllinoisJanuary nights average 26°, milder than 2,861 of 2,886 Illinois towns.Less snow than most of IllinoisAbout 7 inches a winter, less than 2,792 of 2,880 Illinois towns.Warmer summers than most of IllinoisJuly afternoons average 88°, warmer than 2,686 of 2,886 Illinois towns.Wetter than most of Illinois50 inches of rain and melted snow a year, more than 2,874 of 2,886 Illinois towns.
A normal year

Where today sits in Simpson’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
45° / 28°
2 days with an inch or more of snow
Spring
68° / 46°
Last frost around Apr 14
Summer
87° / 66°
47 days reach 90° in a normal year
Fall now
69° / 47°
First frost around Oct 21
Pastthe usual first frost (Oct 21). Last frost next spring: Apr 14
Best months to be outside
AprMaySepOct
Highs of 62–84° and lows of 40° or more
How much snow does Simpson get?About 7 inches a winter.When is it wettest?April, with 5.2 inches.Is it warmer than it used to be?+0.9° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Simpson.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Simpson itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Dixon Springs Agric Ctr, IL (5 mi). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.