Snow in Castle Rock, Colorado Winter storm alerts · 7-day snow forecast · average snowfall
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Castle Rock averages 57.5 inches of snow a year. The snowiest month is February (10.7″), and snow usually falls from September through May. On about 17 days a year at least an inch falls. Snow covers the ground (1″+) on roughly 48 days of an average winter.
Average snowfall by month
Month
Snowfall
Days 1″+
Days with snow cover
Freezing nights
Avg. low
September
0.4″
<1
<1
1
47°F
October
2.7″
1
2
12
35°F
November
6.7″
2
5
24
26°F
December
8.9″
3
11
29
18°F
January
8.0″
3
12
30
18°F
February
10.7″
3
9
26
20°F
March
10.7″
3
5
24
27°F
April
8.3″
3
4
17
33°F
May
1.1″
<1
1
4
42°F
Year
57.5″
17
48
167
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at Castle Rock (4 mi from the city center, -59 ft elevation difference). Averages smooth out big years: single winters can bring half or double the normal.
57.5 inches in an average year (NOAA U.S. Climate Normals 1991–2020, Castle Rock station, 4 miles away). The snowiest month is February with 10.7 inches.
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How many freezing nights does Castle Rock have?
About 167 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, January, averages a low of 18 °F.