Illinois · county areal climate 1951–2025
Marion County, IL
A 55.3°F / 45.2" normal · 2025 ran +1°F vs normal.
2026 so far · through Jul 9: This area is running
+2.6°F (54.5°F) vs the 1996–2025 to-date normal — the
5th warmest start of 76 years. Precipitation
99% of normal.
U.S. year-to-date → Normal (1996–2025)
55.3°F
annual mean · 45.2" precipitation
2025 vs Normal
+1°F
56.3°F · 44.5" (98% of normal)
Warmest Year
57.8°F
2024 · coldest 51.6°F (1979)
Wettest Year
58.0in
1957 · driest 26.5" (1953)
Hottest Day
105.7°F
Jul 14 · 1954
Coldest Day
-19.8°F
Jan 17 · 1977
Biggest Rain Day
4.62in
Apr 5 · 2025
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.