Montana · county areal climate 1951–2025
Petroleum County, MT
A 46.5°F / 14.1" normal · 2025 ran +0.6°F vs normal.
2026 so far · through Aug 29: This area is running
+3.1°F (51.8°F) vs the 1996–2025 to-date normal — the
3rd warmest start of 76 years. Precipitation
86% of normal.
U.S. year-to-date → Normal (1996–2025)
46.5°F
annual mean · 14.1" precipitation
2025 vs Normal
+0.6°F
47.1°F · 15.4" (109% of normal)
Warmest Year
48.8°F
2006 · coldest 40.4°F (1951)
Wettest Year
21.8in
2011 · driest 7.6" (1952)
Hottest Day
111.3°F
Jul 13 · 2026
Coldest Day
-40.6°F
Jan 20 · 1954
Biggest Rain Day
3.0in
Aug 24 · 2014
Record
1951–2025
75 complete years · NOAA nClimGrid
—— normal temperature (°F) · ▮ normal precipitation (in) · 1996–2025
Areal
nClimGrid averages (NOAA/NCEI) over the whole area — an average across the region, not a single station. Separate from the
station records.