McHenry Snowfall Totals & Accumulation Averages

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This page pulls together information on when, how much and how often McHenry, Maryland has snow.

There are data and descriptions here of how many days it snows and the total amount of snowfall that McHenry usually gets. There are also monthly and yearly counts of the days that McHenry normally has heavy snowstorms and deep snow accumulated on the ground. Plus there's information on when McHenry 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 near McHenry and the Wisp Ski Resort.

How Often it Snows in McHenry

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 in McHenry
Days   Inches Centimetres
12.3 January   26.5   67.3
10.5 February   20.9   53.1
  7.2 March   20.6   52.3
  3.7 April     8.2   20.8
  0.1 May   0.2     0.5
  0.4 October     0.5     1.3
  3.9 November     8.3   21.1
  9.2 December   21.6   54.9
47.3 Year 106.8 271.3

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

In December, for instance, one in four years totals over 30.4 inches of snow. Another 25 percent of years receive less than 12.4 inches for the month.

Similarly in January, fresh snowfall in the heaviest years amounts to over 33.4 inches, while the lightest years get less than 18.5 inches.

New snow for February ranges from over 24.8 inches in heavy snowfall years to 15 or fewer inches in light years.

When McHenry Has Its First & Last Snowfalls

The snow usually starts falling at McHenry in November. October also gets some snow once every three or four years.

The season's last snowfall typically happens in April. Sometimes a light dusting of new snow lands in May.

McHenry is normally free of snow every year from June to September.

How Many Snowstorms McHenry Gets

Most days of snowfall in McHenry leave at least an inch of fresh snow on the ground. For 17 days a year on average, the amount of new snow totals three or more inches.

Snowstorms of over five inches a day normally occur six times annually. The town and ski resort average one day a year when a major blizzard dumps ten inches or more of snow. Storms this severe can arrive anytime from November to March.

Number of days per month and year on average in McHenry 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
10.1   4.5 January 1.6 0.1
  9.1   3.6 February 1.1 0.5
  6.0   3.0 March 1.4 0.1
  3.1   1.2 April 0.6 0.0
  0.1   0.0 May 0.0 0.0
  0.1   0.1 October 0.0 0.0
  2.8   1.0 November 0.3 0.1
  7.1   3.3 December 1.1 0.2
38.4 16.7 Year 6.1 1.0

How Much Snow Normally Accumulates in McHenry

For over two-thirds of winter days, McHenry has at least an inch of snow on the ground.

Snow mostly accumulates during January and February. Typically, on five days in January and another seven in February, the snow covering McHenry gets to ten or more inches deep.

Average total days per month and year in McHenry 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
24.9 20.3 January 15.8   4.9
22.0 16.9 February 12.2   6.8
14.8 10.8 March   7.8   3.7
  3.8   1.5 April   0.6   0.1
  0.1   0.0 May   0.0   0.0
  0.2   0.0 October   0.0   0.0
  5.4   2.2 November   0.8   0.1
17.4 11.8 December   7.9   3.4
88.6 63.5 Year 45.1 19.0
Reference

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

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