Boulder Snowfall Totals & Accumulation Averages





This page pulls together information on when, how much and how often Boulder, Colorado has snow.

There are data and descriptions here of how many days it snows and the total amount of snowfall that Boulder usually gets. There are also monthly and yearly counts of the days that Boulder normally has heavy snowstorms and deep snow accumulated on the ground. Plus there's information on when Boulder can expect the first and last snowfalls of the season.

The first set of monthly snow totals are averages for 2010 to 2019. All the other numbers are averages, based on weather data gathered from 1991 to 2020 near Boulder's Green Mountain Memorial Park.

How Often it Snows in Boulder

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 in Boulder, 2010 to 2019
Days   Inches Centi­metres
6.0 January 14.5 36.8
5.0 February 14.6 37.1
4.0 March 16.2 41.1
4.0 April 10.2 25.9
2.0 May 7.4 18.8
0.0 September 0.0 0.0
6.0 October 26.4 67.1
4.0 November 29.5 74.9
1.0 December 3.4 8.6
21.4 Year 96.1 244.0
30-year snowfall averages in Boulder, 1991 to 2020
Days   Inches Centi­metres
5.6 January 11.3 28.7
6.5 February 15.0 38.1
6.0 March 15.7 39.9
4.9 April 14.7 37.3
0.9 May 2.0 5.1
0.5 September 1.0 2.5
2.1 October 7.0 17.8
4.8 November 13.1 33.3
5.3 December 13.0 33.0
36.6 Year 92.8 235.7

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

In December, for instance, one in four years totals over 17.8 inches of snow. Another 25 percent of years receive less than 6.1 inches for the month.

Similarly in January, fresh snowfall in the heaviest years amounts to over 15.2 inches, while the lightest years get less than 5.9 inches.

New snow for February ranges from over 18.5 inches in heavy snowfall years to under 6.5 inches in light years.

March has even greater potential for getting a lot of snow. Once every four years, at least 22.7 inches of snow lands in Boulder during March.

When Boulder Has Its First & Last Snowfalls

The first snowfall of autumn for Boulder can land as early as September, or not show up until November. More likely than not, October gets at least two inches of snow.

The season's last fresh snow comes down in April or May.

Boulder is normally free of snow each year from June to August.

How Many Snowstorms Boulder Gets

Most days of snowfall in Boulder result in at least an inch of fresh snow left on the ground. For 12 days a year on average, the amount of new snow totals three inches or more.

Snowstorms of over five inches a day normally occur six times a year. One of those days, on average involves a major blizzard that dump ten inches or more.

Number of days per month and year on average in Boulder 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
3.2 1.5 January 0.6 0.1
4.0 2.0 February 0.9 0.1
3.6 1.8 March 0.9 0.4
3.3 1.8 April 1.0 0.2
0.5 0.3 May 0.2 0.0
0.3 0.1 September 0.1 0.0
1.2 0.9 October 0.5 0.1
2.8 1.7 November 0.9 0.2
3.1 1.4 December 0.8 0.2
22.0 11.5 Year 5.9 1.3

How Much Snow Normally Accumulates in Boulder

For about a third of winter days, Boulder has at least an inch of snow on the ground.

Typically on three or four days a year, the snow covering Boulder builds up to ten or more inches deep.

Average total days per month and year in Boulder 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
12.9 7.3 January 3.5 0.4
11.0 7.4 February 4.1 0.7
5.5 3.4 March 2.0 0.5
2.9 1.7 April 1.2 0.3
0.3 0.2 May 0.1 0.0
0.1 0.0 September 0.0 0.0
1.8 1.3 October 0.7 0.2
7.0 3.9 November 2.5 0.5
13.0 7.9 December 4.2 0.8
54.5 33.1 Year 18.3 3.4
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Colorado Snowfall
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