Is this weather normal in Stephenson County?

Illinois · county records since 1895, through September 2026.

Weather › Illinois › Stephenson County

Stephenson County just had its 8th-warmest September in 132 years, +4° against the usual. Stephenson County has warmed about 0.5° per decade since 1970.

This week

Usual for Oct 28 to Nov 3: highs near 54°, lows near 34°

That is the 1991 to 2020 average for these dates in Stephenson 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: +1.0°NovDec: -3.9°DecJan 2026: -2.7°JanFeb: +4.9°FebMar: +3.9°MarApr: +5.0°AprMay: -0.2°MayJun: -0.3°JunJul: +2.5°JulAug: +0.1°AugSep: +4.0°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: -1.6 inOctNov: -0.6 inNovDec: -0.4 inDecJan 2026: -0.6 inJanFeb: -1.4 inFebMar: +0.3 inMarApr: +4.3 inAprMay: -3.0 inMayJun: +1.6 inJunJul: -2.4 inJulAug: +0.3 inAugSep: +3.7 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 Stephenson County

MonthUsual high / lowUsual rainWarmestColdest
January29° / 12°1.5 in33.1° 20062.4° 1912
February33° / 16°1.7 in36.1° 19985.9° 1936
March46° / 27°2.3 in51.5° 201219.7° 1960
April59° / 37°3.7 in54.8° 191539.0° 2018
May71° / 48°4.3 in66.2° 189651.2° 1907
June80° / 58°5.5 in75.4° 193362.5° 1958
July83° / 62°4.4 in79.9° 190166.3° 2009
August81° / 60°4.0 in77.5° 194762.7° 1915
September75° / 51°3.8 in68.4° 189755.8° 1918
October62° / 40°3.0 in60.3° 196339.8° 1925
November46° / 29°2.4 in47.2° 200127.4° 1959
December34° / 18°1.9 in36.4° 201511.5° 1983

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

Towns in Stephenson County

Crime Radar: Freeport

Nearby counties