Missouri · county areal climate 1951–2025
St. Charles County, MO
A 56.1°F / 42.0" normal · 2025 ran +0.8°F vs normal.
2026 so far · through Jul 9: This area is running
+2.4°F (55.1°F) vs the 1996–2025 to-date normal — the
4th warmest start of 76 years. Precipitation
103% of normal.
U.S. year-to-date → Normal (1996–2025)
56.1°F
annual mean · 42.0" precipitation
2025 vs Normal
+0.8°F
56.9°F · 38.0" (90% of normal)
Warmest Year
58.7°F
2012 · coldest 52.7°F (1979)
Wettest Year
58.1in
2008 · driest 24.4" (1953)
Hottest Day
110.6°F
Jul 14 · 1954
Coldest Day
-19.2°F
Dec 23 · 1989
Biggest Rain Day
4.96in
Dec 27 · 2015
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.