Mt Washington Snowfall Totals & Accumulation Averages

How Often it Snows on Mt Washington

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 Mt Washington, 2010 to 2019

Days		Inches	Centi­metres
12.7	January	40.7	103.4
12.7	February	50.6	128.5
12.1	March	50.2	127.5
9.4	April	37.5	95.3
2.7	May	10.9	27.7
0.7	June	1.8	4.6
0.0	July	0.0	0.1
0.0	August	0.1	0.2
0.0	September	0.4	0.9
4.5	October	16.9	43.0
9.9	November	34.0	86.2
13.5	December	56.2	142.8
78.2	Year	299.4	760.5

30-year snowfall averages at Mt Washington, 1991 to 2020

Days		Inches	Centi­metres
19.6	January	41.4	105.2
18.1	February	43.3	110.0
18.0	March	46.2	117.3
14.1	April	33.1	84.1
6.5	May	12.9	32.8
1.2	June	1.3	3.3
0.2	July	0.0	0.0
0.2	August	0.1	0.3
1.3	September	1.2	3.0
9.9	October	19.0	48.3
15.1	November	35.6	90.4
19.7	December	47.7	121.2
123.9	Year	281.8	715.8

These averages don't show how much the snowfall at Mt Washington varies from year to year.

In December, for instance, one in four years totals over 56.5 inches of snow. Another 25 percent of years receive less than 36.8 inches for the month.

Similarly in January, fresh snowfall in the heaviest years amounts to over 57.6 inches, while the lightest years get less than 34.2 inches.

New snow for February ranges from over 49.1 inches in heavy snowfall years to under 32.8 inches in light years.

The greatest range occurs in March when years with high amounts of fresh snow get over 62.1 inches, compared with less than 33.7 inches in relatively low-snow years.

When Mt Washington Has Its First & Last Snowfalls

While the summit of Mt Washington is usually clear of snow in July and August, it can and has snowed there every month of the year. The first snowfall of autumn for Mt Washington usually arrives in October or September.

The season's last snowfall typically happens in June, although in some years this month sees no new snow.

How Many Snowstorms Mt Washington Gets

Most days with snowfall on Mt Washington's peak result in at least an inch of fresh snow on the ground. For 31 days a year on average, the amount of new snow totals at three inches or more.

Snowstorms of over five inches a day normally occur 15 times annually. Of these, 3 days are major blizzards that dump ten or more inches of snow in one day. Storms that severe can hit the mountain anytime from October to May.

Number of days per month and year on average on Mt Washington 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
12.3	4.0	January	2.0	0.3
11.4	5.0	February	2.5	0.6
11.3	5.5	March	2.6	0.5
8.4	3.8	April	1.8	0.4
3.1	1.3	May	0.7	0.2
0.4	0.1	June	0.0	0.0
0.3	0.2	September	0.0	0.0
4.8	2.0	October	1.1	0.2
9.4	3.9	November	2.1	0.4
12.3	5.4	December	2.6	0.6
73.7	31.2	Year	15.4	3.2

How Much Snow Normally Accumulates on Mt Washington

Mt Washington's summit has at least an inch of snow on the ground for most of November through April.

Typically, on 62 days a year the snow covering the top of Mt Washington gets to ten or more inches deep. On an average of 16 of those days the snowpack builds up to over 20 inches deep. Ssnow cover can reach 20 inches at Mt Washington anytime from October to April, and most frequently occurs in March.

Average total days per month and year at Mt Washington 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
30.4	26.5	January	20.7	11.1
28.5	26.9	February	22.6	15.0
30.9	29.6	March	25.7	14.3
27.4	22.5	April	16.8	8.3
11.2	5.6	May	3.4	1.0
0.7	0.1	June	0.0	0.0
0.4	0.0	September	0.0	0.0
10.5	3.9	October	2.1	1.2
21.7	12.9	November	7.5	2.0
29.3	22.9	December	18.4	8.8
191.0	150.9	Year	117.2	61.7