Is this weather normal in Brown County?

South Dakota · county records since 1895, through September 2026.

Weather › South Dakota › Brown County

Brown County has warmed about 0.4° per decade since 1970. September 2026 averaged 63.9° there, 3.7° above the usual for September (12th warmest of 132).

This week

Usual for Oct 28 to Nov 3: highs near 49°, lows near 27°

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

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usual high for the datewarmercooler

The last 12 months

Oct: +6.7°OctNov: +4.2°NovDec: -1.6°DecJan 2026: +1.5°JanFeb: +8.8°FebMar: +3.5°MarApr: -2.1°AprMay: -0.7°MayJun: -0.3°JunJul: +3.5°JulAug: -0.4°AugSep: +3.7°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: -1.3 inOctNov: +0.1 inNovDec: +0.0 inDecJan 2026: -0.4 inJanFeb: +0.0 inFebMar: -0.5 inMarApr: +0.0 inAprMay: -0.4 inMayJun: -1.6 inJunJul: +2.3 inJulAug: -0.9 inAugSep: +0.6 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 Brown County

MonthUsual high / lowUsual rainWarmestColdest
January21° / 3°0.5 in26.2° 2006-6.6° 1937
February26° / 7°0.6 in32.0° 1954-10.4° 1936
March40° / 20°0.9 in43.1° 201210.6° 1899
April55° / 31°1.9 in52.0° 189533.3° 2013
May68° / 44°3.1 in67.0° 193446.6° 1907
June78° / 55°3.7 in76.1° 193359.0° 1945
July83° / 60°3.4 in82.8° 193663.4° 1992
August81° / 57°2.4 in76.2° 193763.5° 1897
September73° / 47°2.2 in66.9° 189748.9° 1965
October58° / 34°2.0 in55.3° 196333.7° 1925
November40° / 21°0.7 in40.6° 20168.3° 1896
December26° / 9°0.6 in28.9° 2023-1.7° 1983

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

Towns in Brown County

Crime Radar: Aberdeen

Nearby counties