Is this weather normal in De Witt County?

Illinois · county records since 1895, through September 2026.

Weather › Illinois › De Witt County

De Witt County just had its warmest September ever recorded, +6° against the usual. De Witt County has warmed about 0.5° per decade since 1970.

This week

Usual for Oct 28 to Nov 3: highs near 58°, lows near 37°

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

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usual high for the datewarmercooler

The last 12 months

Oct: +4.9°OctNov: +1.2°NovDec: -2.9°DecJan 2026: -2.1°JanFeb: +3.3°FebMar: +6.9°MarApr: +5.9°AprMay: -1.0°MayJun: -0.6°JunJul: +0.7°JulAug: +0.9°AugSep: +6.1°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: -1.9 inOctNov: -1.4 inNovDec: -0.9 inDecJan 2026: -1.4 inJanFeb: -1.6 inFebMar: +2.4 inMarApr: +2.1 inAprMay: -2.5 inMayJun: +3.2 inJunJul: -2.5 inJulAug: +3.3 inAugSep: -1.3 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 De Witt County

MonthUsual high / lowUsual rainWarmestColdest
January34° / 18°2.2 in37.4° 20068.7° 1977
February39° / 21°1.9 in40.3° 201715.7° 1979
March51° / 31°2.7 in55.2° 201224.1° 1960
April64° / 41°3.9 in58.0° 202641.6° 1907
May74° / 52°4.5 in71.5° 201854.9° 1917
June83° / 61°4.4 in78.3° 193464.3° 1903
July85° / 64°4.1 in82.8° 193669.4° 2014
August84° / 62°3.5 in80.4° 194766.5° 1915
September79° / 54°3.2 in72.6° 202657.7° 1918
October66° / 43°3.3 in63.3° 196343.1° 1925
November51° / 32°3.0 in49.3° 200132.4° 1951
December38° / 23°2.3 in40.3° 201515.7° 1983

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

Towns in De Witt County

Crime Radar: Clinton, Heyworth

Nearby counties