McHenry Snowfall Totals & Accumulation Averages

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