Yellowstone Park Snowfall Totals & Accumulation Averages

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This page pulls together information on when, how much and how often Mammoth Hot Springs in Yellowstone National Park, Wyoming has snow.

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

All the numbers are long-term historical averages based on weather data gathered from 1981 to 2010 at Mammoth Hot Springs, near Yellowstone Park's north entrance.

How Often it Snows in Yellowstone Park

This first table lists monthly and yearly totals for amount of snow and how many days it snows at least 0.1 inches (0.25 centimetres).

Average total snowfall and days with fresh snow at Mammoth Hot Springs
Days   Inches Centimetres
  8.0 January 11.1   28.2
  7.1 February   8.5   21.6
  6.4 March 10.4   26.4
  4.8 April   8.0   20.3
  1.2 May   2.2     5.6
  0.1 June   0.3     0.8
  0.2 September   0.3     0.8
  2.6 October   4.0   10.2
  7.2 November   9.4   23.9
  8.3 December 10.2   25.9
45.9 Year 64.4 163.6

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

In December, for instance, one in four years totals over 15.6 inches of snow. Another 25 percent of years receive less than 6.8 inches for the month.

Similarly in January, fresh snowfall in the heaviest years amounts to over 14.8 inches, while the lightest years get less than six inches.

New snow for February ranges from over 10.5 inches in heavy snowfall years to under 5.5 inches in light years.

When Yellowstone Park Has Its First & Last Snowfalls

The first snowfall of autumn at Mammoth Hot Springs usually arrives in October. Occasionally September also gets a little snow.

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.

Mammoth is normally free of snow every year during July and August.

How Many Snowstorms Yellowstone Park Gets

Most days of snowfall at Mammoth Hot Springs leave behind at least an inch of fresh snow. For six days a year on average, the amount of new snow totals three inches or more.

Snowstorms of over five inches a day normally occur a couple times a year. But major blizzards that dump ten inches or more in one day are rare events that only happen about once a decade.

Number of days per month and year on average at Mammoth Hot Springs 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
  4.7 0.9 January 0.3 0.1
  4.3 0.4 February 0.1 0.0
  3.9 1.1 March 0.5 0.0
  3.1 0.8 April 0.3 0.0
  0.8 0.3 May 0.1 0.0
  0.1 0.0 June 0.0 0.0
  0.1 0.0 September 0.0 0.0
  1.4 0.3 October 0.1 0.0
  4.0 1.2 November 0.5 0.0
  5.3 1.0 December 0.2 0.0
27.7 6.0 Year 2.1 0.1

How Much Snow Normally Accumulates in Yellowstone Park

Throughout most of winter, Mammoth Hot Springs has at least an inch of snow on the ground.

Snow mostly accumulates during February. Typically, on eight days in February plus another five in January, the snow covering this part of Yellowstone Park gets to ten or more inches deep.

Average total days per month and year at Mammoth Hot Springs 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
  29.9 28.2 January 21.6   4.6
  25.9 23.7 February 18.9   7.5
  16.9 12.4 March   9.3   2.6
    5.2   2.2 April   1.2   0.2
    1.1   0.3 May   0.1   0.0
    0.1   0.0 June   0.0   0.0
    0.1   0.0 September   0.0   0.0
    2.5   0.8 October   0.4   0.2
  15.4   8.3 November   3.2   0.5
  27.7 20.0 December 11.4   1.7
124.8 95.9 Year 66.1 17.3
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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