Illinois · county areal climate 1951–2025
Stephenson County, IL
A 48.7°F / 38.0" normal · 2025 ran +0.2°F vs normal.
2026 so far · through Jul 10: This area is running
+1.6°F (46.4°F) vs the 1996–2025 to-date normal — the
9th warmest start of 76 years. Precipitation
104% of normal.
U.S. year-to-date → Normal (1996–2025)
48.7°F
annual mean · 38.0" precipitation
2025 vs Normal
+0.2°F
48.9°F · 29.6" (78% of normal)
Warmest Year
51.7°F
2012 · coldest 44.2°F (1951)
Wettest Year
51.2in
2019 · driest 22.3" (1988)
Hottest Day
101.5°F
Jul 7 · 2012
Coldest Day
-31.1°F
Jan 30 · 1951
Biggest Rain Day
3.94in
Jul 23 · 2010
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.