Illinois · county areal climate 1951–2025
Johnson County, IL
A 57.3°F / 49.8" normal · 2025 ran +0.2°F vs normal.
2026 so far · through Jul 10: This area is running
+1.9°F (56.3°F) vs the 1996–2025 to-date normal — the
5th warmest start of 76 years. Precipitation
75% of normal.
U.S. year-to-date → Normal (1996–2025)
57.3°F
annual mean · 49.8" precipitation
2025 vs Normal
+0.2°F
57.5°F · 47.4" (95% of normal)
Warmest Year
60.0°F
2012 · coldest 53.4°F (1979)
Wettest Year
70.9in
2011 · driest 31.2" (1953)
Hottest Day
106.3°F
Jun 30 · 2012
Coldest Day
-14.8°F
Jan 21 · 1985
Biggest Rain Day
5.65in
Mar 19 · 2008
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.