Casper Snowfall Totals & Accumulation Averages

How Often it Snows in Casper

The next two tables list monthly and yearly totals for amount of snow and how many days it snows at least 0.1 inches (0.25 centimetres).

10-year snowfall averages at Casper, 2010 to 2019

Days		Inches	Centi­metres
3.2	January	9.4	24.0
3.7	February	12.6	32.1
3.2	March	11.4	29.0
3.0	April	10.1	25.6
0.9	May	2.5	6.3
0.0	June	0.0	0.0
0.2	September	0.6	1.5
1.5	October	5.2	13.3
3.3	November	9.5	24.2
3.8	December	14.0	35.6
22.8	Year	75.4	191.6

30-year snowfall averages at Casper, 1991 to 2020

Days		Inches	Centi­metres
6.1	January	9.0	22.9
7.5	February	10.9	27.7
6.8	March	10.3	26.2
6.0	April	10.5	26.7
1.6	May	2.6	6.6
0.0	June	0.1	0.3
0.5	September	1.5	3.8
3.8	October	7.0	17.8
5.6	November	8.9	22.6
7.6	December	11.0	27.9
45.5	Year	71.8	182.4

These averages don't show how much the snowfall in Casper varies from year to year.

In December, for instance, one in four years totals over 15.9 inches of snow. Another 25 percent of years receive less than 5.7 inches for the month.

Similarly in January, fresh snowfall in the heaviest years amounts to over 12.9 inches, while the lightest years get less than 4.9 inches.

New snow for February ranges from over 12.7 inches in heavy snowfall years to under 6.5 inches in light years.

When Casper Has Its First & Last Snowfalls

The first snowfall of autumn for Casper usually arrives in October. Once every three or four years it starts snowing in September.

The season's last snowfall most often happens in May. But in some years it stops snowing as early as April, while in others new snow lands as late as June.

Casper is normally free of snow every year in July and August.

How Many Snowstorms Casper Gets

About half the days of snowfall in Casper leave just a skiff, amounting to less than an inch of fresh snow. For 22 days a year on average, the amount of new snow totals at least an inch.

Snowstorms of over five inches a day normally occur two or three times a year. But major blizzards that dump ten inches or more in one day are uncommon events that don't appear every year.

Number of days per month and year on average in Casper with a total snowfall of at least 1, 3, 5 or 10 inches

1 inch 2.5 cm	3 inches 7.6 cm		5 inches 12.7 cm	10 inches 25.4 cm
3.1	0.9	January	0.2	0.0
3.3	1.1	February	0.4	0.1
3.2	0.8	March	0.4	0.1
3.2	1.3	April	0.4	0.0
0.7	0.3	May	0.1	0.0
0.0	0.0	June	0.0	0.0
0.4	0.2	September	0.1	0.0
1.9	0.7	October	0.3	0.1
2.9	1.0	November	0.3	0.0
3.5	1.1	December	0.5	0.0
22.2	7.4	Year	2.7	0.3

How Much Snow Normally Accumulates in Casper

For half of winter days Casper has at least an inch of snow on the ground.

Typically on 11 days days a year the snow covering Casper gets to five or more inches deep.

Average total days per month and year in Casper with snow depth of at least 1, 3, 5 or 10 inches on the ground

1 inch 2.5 cm	3 inches 7.6 cm		5 inches 12.7 cm	10 inches 25.4 cm
17.2	8.0	January	3.0	0.0
12.1	5.7	February	2.1	0.4
6.1	1.7	March	0.9	0.0
3.0	1.1	April	0.7	0.2
0.6	0.2	May	0.0	0.0
0.1	0.0	June	0.0	0.0
0.2	0.1	September	0.1	0.0
2.0	0.6	October	0.4	0.1
6.8	2.8	November	0.9	0.1
16.3	7.7	December	2.6	0.0
64.4	27.9	Year	10.7	0.8