Is this weather normal in Petroleum County?

Montana · county records since 1895, through September 2026.

Weather › Montana › Petroleum County

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

This week

Usual for Oct 28 to Nov 3: highs near 52°, lows near 28°

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

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usual high for the datewarmercooler

The last 12 months

Oct: +1.2°OctNov: +4.9°NovDec: +4.5°DecJan 2026: +6.8°JanFeb: +8.0°FebMar: +4.8°MarApr: -0.9°AprMay: +2.9°MayJun: -3.0°JunJul: +5.5°JulAug: +0.4°AugSep: +1.7°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: -0.1 inOctNov: -0.1 inNovDec: +0.5 inDecJan 2026: -0.3 inJanFeb: +0.1 inFebMar: +0.8 inMarApr: -0.4 inAprMay: -1.1 inMayJun: -0.5 inJunJul: +0.1 inJulAug: +0.3 inAugSep: +0.2 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 Petroleum County

MonthUsual high / lowUsual rainWarmestColdest
January34° / 12°0.4 in36.2° 2006-6.1° 1950
February38° / 14°0.4 in38.8° 1991-5.2° 1936
March48° / 23°0.6 in45.6° 191017.3° 1899
April58° / 32°1.4 in54.3° 191036.0° 1920
May67° / 41°2.7 in63.2° 193448.6° 1899
June77° / 50°2.9 in74.3° 198856.2° 1951
July87° / 56°1.5 in80.0° 193661.2° 1993
August86° / 54°1.2 in75.9° 200363.4° 1974
September75° / 45°1.1 in66.2° 199847.1° 1965
October60° / 33°1.1 in52.7° 196334.0° 1925
November46° / 22°0.5 in44.0° 194913.1° 1985
December36° / 14°0.5 in35.2° 20234.1° 1983

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

Towns in Petroleum County

Nearby counties