South Dakota · county areal climate 1951–2025
Dewey County, SD
A 45.6°F / 18.7" normal · 2025 ran +0.8°F vs normal.
2026 so far · through Jul 10: This area is running
+3.2°F (44.5°F) vs the 1996–2025 to-date normal — the
7th warmest start of 76 years. Precipitation
62% of normal.
U.S. year-to-date → Normal (1996–2025)
45.6°F
annual mean · 18.7" precipitation
2025 vs Normal
+0.8°F
46.4°F · 26.1" (140% of normal)
Warmest Year
48.5°F
2012 · coldest 40.5°F (1951)
Wettest Year
29.2in
2019 · driest 9.5" (2002)
Hottest Day
112.1°F
Jul 16 · 2006
Coldest Day
-33.1°F
Jan 29 · 1966
Biggest Rain Day
2.96in
Oct 5 · 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.