Is this weather normal in Lewis and Clark County?

Montana · county records since 1895, through September 2026.

Weather › Montana › Lewis and Clark County

10 of the last 12 months ran warmer than usual in Lewis and Clark County. Lewis and Clark County has warmed about 0.5° per decade since 1970.

This week

Usual for Oct 28 to Nov 3: highs near 45°, lows near 27°

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

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usual high for the datewarmercooler

The last 12 months

Oct: -0.1°OctNov: +5.6°NovDec: +8.1°DecJan 2026: +5.5°JanFeb: +7.4°FebMar: +4.3°MarApr: +0.5°AprMay: +2.4°MayJun: -1.9°JunJul: +4.2°JulAug: +1.3°AugSep: +0.7°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: +0.4 inOctNov: -0.4 inNovDec: +2.7 inDecJan 2026: -0.7 inJanFeb: -0.4 inFebMar: +1.1 inMarApr: -0.0 inAprMay: +0.1 inMayJun: -0.2 inJunJul: -0.0 inJulAug: -0.2 inAugSep: +1.1 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 Lewis and Clark County

MonthUsual high / lowUsual rainWarmestColdest
January33° / 16°1.7 in32.1° 2006-5.0° 1916
February34° / 15°1.6 in34.8° 2016-2.6° 1936
March43° / 22°1.6 in39.7° 191018.6° 1951
April50° / 28°2.1 in47.0° 191028.0° 1975
May59° / 35°2.9 in54.9° 189740.6° 1927
June67° / 42°3.1 in61.7° 198847.8° 1901
July78° / 48°1.3 in69.9° 200753.5° 1993
August77° / 46°1.2 in66.5° 197156.0° 1993
September66° / 40°1.5 in58.8° 202540.7° 1965
October52° / 31°1.8 in47.0° 201431.0° 1919
November39° / 22°1.8 in39.1° 201611.0° 1985
December32° / 16°1.8 in32.6° 20236.1° 1983

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

Towns in Lewis and Clark County

Nearby counties