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Weather in Keystone, SD · National Weather Service + NOAA

Keystone is snow country

Keystone has cold, snowy winters and pleasant summers, with very little rain. A typical July afternoon reaches 81°, a January night drops to 14°, and about 59 inches of snow falls in a normal winter. In November, a normal day reaches 46° and a normal night drops to 22°.

Winter 38°/14°Spring 54°/30°Summer 78°/52°Fall 58°/33°
Right now
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Sunrise 8:31 am · sunset 6:42 pm

Getting the latest forecast from the National Weather Service…

What stands out about Keystone’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Snow countryAbout 59 inches a winter, more than 1,327 of 1,367 South Dakota towns.Milder winters than most of South DakotaJanuary nights average 14°, milder than 1,373 of 1,384 South Dakota towns.Cool summersJuly afternoons average 81°, cooler than 1,281 of 1,384 South Dakota towns.A short growing season138 frost-free days, from May 15 to Oct 1.
A normal year

Where today sits in Keystone’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
38° / 14°
20 days with an inch or more of snow
Spring
54° / 30°
Last frost around May 15
Summer
78° / 52°
6 days reach 90° in a normal year
Fall now
58° / 33°
First frost around Oct 1
Pastthe usual first frost (Oct 1). Last frost next spring: May 15
Best months to be outside
JunJulAugSep
Highs of 62–84° and lows of 40° or more
How much snow does Keystone get?About 59 inches a winter.When is it wettest?May, with 4.3 inches.Is it warmer than it used to be?+1.4° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Keystone.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Keystone itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Mt Rushmore Nmem, SD (2 mi). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.