Illinois · county areal climate 1951–2025
Boone County, IL
A 48.7°F / 37.1" normal · 2025 ran +0.9°F vs normal.
2026 so far · through Jul 10: This area is running
+2.1°F (46.8°F) vs the 1996–2025 to-date normal — the
7th warmest start of 76 years. Precipitation
116% of normal.
U.S. year-to-date → Normal (1996–2025)
48.7°F
annual mean · 37.1" precipitation
2025 vs Normal
+0.9°F
49.6°F · 33.4" (90% of normal)
Warmest Year
52.0°F
2024 · coldest 44.6°F (2014)
Wettest Year
49.2in
1972 · driest 23.9" (1958)
Hottest Day
101.8°F
Jul 7 · 2012
Coldest Day
-27.9°F
Jan 31 · 2019
Biggest Rain Day
3.56in
Sep 14 · 1961
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.