Is this weather normal in Bon Homme County?

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

Weather › South Dakota › Bon Homme County

8.1 inches fell in September, the most for a September in Bon Homme County in 132 years. Every one of the last 12 months ran warmer than usual there.

This week

Usual for Oct 28 to Nov 3: highs near 54°, lows near 31°

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

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usual high for the datewarmercooler

The last 12 months

Oct: +5.9°OctNov: +4.1°NovDec: +2.4°DecJan 2026: +2.1°JanFeb: +9.6°FebMar: +6.8°MarApr: +0.5°AprMay: +1.0°MayJun: +0.7°JunJul: +4.4°JulAug: +1.2°AugSep: +4.5°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: -0.9 inOctNov: -0.2 inNovDec: -0.1 inDecJan 2026: -0.5 inJanFeb: -0.7 inFebMar: -1.1 inMarApr: -1.1 inAprMay: -1.5 inMayJun: -1.1 inJunJul: -1.2 inJulAug: -1.6 inAugSep: +5.3 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 Bon Homme County

MonthUsual high / lowUsual rainWarmestColdest
January30° / 11°0.6 in34.9° 20062.9° 1937
February35° / 14°0.8 in37.9° 1954-2.1° 1936
March47° / 25°1.4 in51.8° 201218.9° 1960
April60° / 36°3.0 in56.8° 198138.5° 2018
May71° / 47°3.8 in71.3° 193451.1° 1907
June82° / 58°3.8 in78.6° 193362.3° 1951
July87° / 63°3.0 in86.0° 193666.8° 1992
August84° / 61°3.2 in79.7° 194765.3° 1915
September77° / 51°2.8 in70.7° 189753.4° 1965
October62° / 38°2.3 in59.7° 196339.6° 1925
November47° / 25°1.0 in45.2° 199918.4° 1896
December33° / 15°0.8 in32.4° 20233.3° 1983

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

Towns in Bon Homme County

Nearby counties