South Dakota · county areal climate 1951–2025
Union County, SD
A 48.2°F / 27.8" normal · 2025 ran +1.4°F vs normal.
2026 so far · through Jul 10: This area is running
+3.4°F (47.8°F) vs the 1996–2025 to-date normal — the
4th warmest start of 76 years. Precipitation
68% of normal.
U.S. year-to-date → Normal (1996–2025)
48.2°F
annual mean · 27.8" precipitation
2025 vs Normal
+1.4°F
49.6°F · 27.9" (100% of normal)
Warmest Year
52.1°F
2012 · coldest 43.7°F (1951)
Wettest Year
39.3in
2018 · driest 13.5" (1976)
Hottest Day
106.5°F
Jun 22 · 1988
Coldest Day
-29.2°F
Jan 19 · 1970
Biggest Rain Day
3.85in
Jul 22 · 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.