Is this weather normal in Mellette County?

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

Weather › South Dakota › Mellette County

Every one of the last 12 months ran warmer than usual in Mellette County. Mellette County has warmed about 0.4° per decade since 1970.

This week

Usual for Oct 28 to Nov 3: highs near 55°, lows near 30°

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

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usual high for the datewarmercooler

The last 12 months

Oct: +5.1°OctNov: +4.9°NovDec: +6.3°DecJan 2026: +2.1°JanFeb: +10.6°FebMar: +7.5°MarApr: +1.0°AprMay: +2.2°MayJun: +0.4°JunJul: +4.8°JulAug: +1.4°AugSep: +3.8°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: -1.0 inOctNov: -0.2 inNovDec: -0.2 inDecJan 2026: -0.1 inJanFeb: -0.5 inFebMar: -0.7 inMarApr: +0.0 inAprMay: -1.9 inMayJun: +1.5 inJunJul: -0.0 inJulAug: +0.8 inAugSep: +0.8 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 Mellette County

MonthUsual high / lowUsual rainWarmestColdest
January34° / 12°0.5 in37.4° 20063.0° 1937
February38° / 15°0.6 in40.1° 1954-2.9° 1936
March49° / 24°1.1 in49.6° 201215.8° 1899
April59° / 33°2.4 in54.4° 194637.4° 1920
May70° / 44°3.4 in69.9° 193449.6° 1907
June80° / 55°3.5 in77.6° 193359.6° 1945
July89° / 61°2.6 in85.5° 193666.3° 1992
August87° / 59°2.3 in80.0° 193765.3° 1915
September78° / 49°1.7 in71.8° 202451.8° 1965
October63° / 36°1.6 in59.6° 196338.1° 1925
November48° / 24°0.6 in45.4° 199915.4° 1896
December36° / 15°0.5 in33.8° 20235.0° 1983

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

Towns in Mellette County

Nearby counties