Illinois · county areal climate 1951–2025
McHenry County, IL
A 48.7°F / 37.0" normal · 2025 ran +0.5°F vs normal.
2026 so far · through Jul 10: This area is running
+2.1°F (46.7°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)
48.7°F
annual mean · 37.0" precipitation
2025 vs Normal
+0.5°F
49.2°F · 32.0" (87% of normal)
Warmest Year
51.9°F
2024 · coldest 44.5°F (2014)
Wettest Year
48.8in
2019 · driest 23.8" (1956)
Hottest Day
102.5°F
Jul 14 · 1995
Coldest Day
-26.6°F
Jan 31 · 2019
Biggest Rain Day
3.54in
Apr 18 · 2013
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.