Missouri · county areal climate 1951–2025
Jefferson County, MO
A 56.6°F / 43.3" normal · 2025 ran +0.5°F vs normal.
2026 so far · through Jul 10: This area is running
+2.2°F (55.7°F) vs the 1996–2025 to-date normal — the
4th warmest start of 76 years. Precipitation
100% of normal.
U.S. year-to-date → Normal (1996–2025)
56.6°F
annual mean · 43.3" precipitation
2025 vs Normal
+0.5°F
57.1°F · 37.3" (86% of normal)
Warmest Year
59.8°F
2012 · coldest 53.1°F (1979)
Wettest Year
60.3in
1957 · driest 24.6" (1976)
Hottest Day
109.9°F
Jul 14 · 1954
Coldest Day
-17.8°F
Jan 17 · 1977
Biggest Rain Day
3.75in
Sep 8 · 2018
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.