Is this weather normal in Shelby County?

Illinois · county records since 1895, through September 2026.

Weather › Illinois › Shelby County

Shelby County just had its warmest September ever recorded, +7° against the usual. Shelby County has warmed about 0.4° per decade since 1970.

This week

Usual for Oct 28 to Nov 3: highs near 60°, lows near 39°

That is the 1991 to 2020 average for these dates in Shelby County. The Weather Service forecast fills in below.

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usual high for the datewarmercooler

The last 12 months

Oct: +4.4°OctNov: +1.5°NovDec: -2.2°DecJan 2026: -2.9°JanFeb: +2.1°FebMar: +6.9°MarApr: +6.2°AprMay: -1.8°MayJun: -0.5°JunJul: +0.7°JulAug: +0.8°AugSep: +7.2°Sepwarmercooler

Each bar is a month's average temperature against the usual for that month (1991 to 2020). Ranks compare the same month in every year since 1895.

Every year since 1895

18952025

Rain and drought

Oct: -0.7 inOctNov: -1.1 inNovDec: -1.2 inDecJan 2026: -1.4 inJanFeb: -1.2 inFebMar: +3.0 inMarApr: +2.3 inAprMay: +0.1 inMayJun: +2.5 inJunJul: -1.9 inJulAug: -0.0 inAugSep: -1.9 inSepwetterdrier

Rain and melted snow against the usual for each month. The drought reading is NOAA's Palmer index for the county.

Month by month in Shelby County

MonthUsual high / lowUsual rainWarmestColdest
January36° / 20°2.6 in39.3° 200610.8° 1977
February41° / 24°2.2 in42.0° 201717.5° 1978
March52° / 33°3.0 in56.0° 201225.7° 1960
April65° / 43°4.5 in59.9° 201043.2° 1907
May75° / 54°4.8 in72.1° 201856.0° 1924
June84° / 62°4.8 in79.2° 193465.8° 1903
July86° / 66°4.0 in84.1° 193670.1° 2014
August85° / 64°3.3 in81.7° 194767.6° 1915
September80° / 56°3.0 in74.8° 202659.4° 1918
October67° / 45°3.5 in63.3° 196346.0° 1925
November52° / 34°3.5 in50.4° 200134.7° 1951
December40° / 25°2.5 in41.5° 201518.4° 1983

Warmest and coldest are the month's whole-month average temperature, with the year it happened.

Towns in Shelby County

Crime Radar: Shelbyville, Lakewood

Nearby counties