Illinois · county areal climate 1951–2025
Mercer County, IL
A 37.1" / 51.0°F normal · 2025 ran 87% of normal precipitation.
2026 so far · through Jul 25: This area is at
95% (21.49") of the 1996–2025 to-date normal — the
44th driest start of 76 years. Temperature
+2.5°F vs normal.
U.S. year-to-date → Normal (1996–2025)
37.1in
annual precipitation · 51.0°F
2025 vs Normal
87%
32.1" · 52.2°F (+1.2 vs normal)
Biggest Rain Day
3.7in
Sep 13 · 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.