Is this weather normal in Jefferson County?

Idaho · county records since 1895, through September 2026.

Weather › Idaho › Jefferson County

Jefferson County is in extreme drought: NOAA's Palmer reading for September was -5.5. 11 of the last 12 months ran warmer than usual there.

This week

Usual for Oct 28 to Nov 3: highs near 50°, lows near 25°

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

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usual high for the datewarmercooler

The last 12 months

Oct: +1.0°OctNov: +7.2°NovDec: +11.3°DecJan 2026: +6.1°JanFeb: +9.4°FebMar: +9.4°MarApr: -0.2°AprMay: +2.5°MayJun: +0.9°JunJul: +5.9°JulAug: +3.3°AugSep: +2.0°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: +0.4 inOctNov: -0.6 inNovDec: +0.9 inDecJan 2026: -0.3 inJanFeb: -0.1 inFebMar: -0.4 inMarApr: -0.3 inAprMay: -0.4 inMayJun: -0.8 inJunJul: -0.3 inJulAug: +0.1 inAugSep: +0.3 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 Jefferson County

MonthUsual high / lowUsual rainWarmestColdest
January28° / 10°0.7 in28.9° 1953-0.1° 1937
February34° / 13°0.5 in34.1° 20157.5° 1933
March46° / 24°0.7 in44.2° 202618.9° 1964
April57° / 30°1.0 in51.3° 193435.0° 1975
May67° / 39°1.5 in59.4° 193446.5° 2010
June76° / 45°1.2 in67.5° 202154.1° 1908
July87° / 51°0.5 in74.7° 202658.8° 1993
August85° / 49°0.6 in71.5° 202260.5° 1968
September74° / 40°0.8 in62.3° 202248.4° 1912
October59° / 30°0.8 in51.2° 201535.6° 2019
November42° / 20°0.6 in37.9° 202521.5° 1985
December29° / 11°0.8 in31.6° 19179.2° 1990

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

Towns in Jefferson County

Nearby counties