South Dakota · county areal climate 1951–2025

Dewey County, SD

A 18.7" / 45.6°F normal · 2025 ran 140% of normal precipitation.
2026 so far · through Jul 25: This area is at 57% (6.81") of the 1996–2025 to-date normal — the 4th driest start of 76 years. Temperature +3.3°F vs normal. U.S. year-to-date →

Normal (1996–2025)

18.7in
annual precipitation · 45.6°F

2025 vs Normal

140%
26.1" · 46.4°F (+0.8 vs normal)

Wettest Year

29.2in
2019

Driest Year

9.5in
2002

Biggest Rain Day

2.96in
Oct 5 · 2013

Warmest Year

48.5°F
2012

Record

1951–2025
75 complete years · NOAA nClimGrid

Monthly Climate

18°
J
20°
F
32°
M
44°
A
56°
M
67°
J
74°
J
71°
A
62°
S
47°
O
33°
N
21°
D
—— 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.

Nearby

← All South Dakota countiesU.S. overview
DriestSince · browse by state · precipitation & snowfall records · NOAA/RCC-ACIS ThreadEx gauge record · part of Weather Trader · supported by Substack Subscribers
© 2026 Weather Trader · All rights reserved