Snow in Thornton, Colorado Winter storm alerts · 7-day snow forecast · average snowfall
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Thornton averages 44.8 inches of snow a year. The snowiest month is March (8.2″), and snow usually falls from September through May. On about 16 days a year at least an inch falls. Snow covers the ground (1″+) on roughly 35 days of an average winter.
Average snowfall by month
Month
Snowfall
Days 1″+
Days with snow cover
Freezing nights
Avg. low
September
0.1″
<1
0
1
49°F
October
2.4″
1
2
8
37°F
November
6.9″
2
5
22
27°F
December
5.9″
2
8
29
19°F
January
6.0″
2
7
29
19°F
February
7.6″
3
7
26
20°F
March
8.2″
2
4
22
28°F
April
6.5″
2
3
11
35°F
May
1.2″
<1
<1
2
44°F
Year
44.8″
16
35
149
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at Northglenn (3 mi from the city center, +43 ft elevation difference). Averages smooth out big years: single winters can bring half or double the normal.
44.8 inches in an average year (NOAA U.S. Climate Normals 1991–2020, Northglenn station, 3 miles away). The snowiest month is March with 8.2 inches.
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How many freezing nights does Thornton have?
About 149 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, January, averages a low of 19 °F.