Autumn (September–November): Avg. 48–65°F, cool climate, decreasing rainfall. Common activities: Viewing autumn leaves (if the area has deciduous trees), hiking. Recommended clothing: Long-sleeved shirt, light jacket.
Winter (December–February): Avg. -2.7–-34.0°F, cold climate, possibility of snowfall or rainfall. Common activities: Skiing, snowshoeing (if sufficient snow). Recommended clothing: Heavy coat, hat, scarf, gloves.
Spearfish climatological average
Annual average temperature: approx. 47.7°F / Annual rainfall: approx. 647 mm / Summer humidity: 60%–70% / Rainiest month: May
Spearfish monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
27.1°F
25.2
February
29.3°F
30.3
March
32.2°F
29.6
April
41.9°F
96.1
May
54.3°F
133.2
June
64.2°F
89.4
July
72°F
38.5
August
71.1°F
69.7
September
65.1°F
44.5
October
48.7°F
35.3
November
35.4°F
14.7
December
30°F
41.4
Spearfish weather for the next seven days
12/15
Monday
Sunny
67.5°F/45.1°F
12/16
Tuesday
Cloudy
54.5°F/36.5°F
12/17
Wednesday
Heavy rain
46.2°F/29.8°F
12/18
Thursday
Cloudy
35.6°F/25.3°F
12/19
Friday
Patchy rain nearby
53.8°F/28.6°F
12/20
Saturday
Moderate or heavy snow showers
32.6°F/20.5°F
12/21
Sunday
Partly Cloudy
40.7°F/21.8°F
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