Illinois · county areal climate 1951–2025
DeKalb County, IL
A 49.3°F / 36.9" normal · 2025 ran +1°F vs normal.
2026 so far · through Jul 9: This area is running
+2.1°F (47.3°F) vs the 1996–2025 to-date normal — the
8th warmest start of 76 years. Precipitation
111% of normal.
U.S. year-to-date → Normal (1996–2025)
49.3°F
annual mean · 36.9" precipitation
2025 vs Normal
+1°F
50.3°F · 30.7" (83% of normal)
Warmest Year
52.4°F
2024 · coldest 45.4°F (2014)
Wettest Year
48.9in
1972 · driest 22.7" (2005)
Hottest Day
101.9°F
Jul 14 · 1995
Coldest Day
-26.4°F
Jan 31 · 2019
Biggest Rain Day
5.71in
Jul 18 · 1996
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.