Illinois · county areal climate 1951–2025
Grundy County, IL
A 51.2°F / 37.0" normal · 2025 ran +0.8°F vs normal.
2026 so far · through Jul 9: This area is running
+1.8°F (49.1°F) vs the 1996–2025 to-date normal — the
8th warmest start of 76 years. Precipitation
122% of normal.
U.S. year-to-date → Normal (1996–2025)
51.2°F
annual mean · 37.0" precipitation
2025 vs Normal
+0.8°F
52.0°F · 30.8" (83% of normal)
Warmest Year
54.4°F
2012 · coldest 47.4°F (2014)
Wettest Year
51.9in
2019 · driest 22.2" (1963)
Hottest Day
102.5°F
Jul 8 · 2012
Coldest Day
-24.7°F
Jan 20 · 1985
Biggest Rain Day
4.45in
Jun 26 · 1978
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.