New Hampshire Snow Day Calculator: Chances & Closure Norms
What closes New Hampshire schools? Snowday's New Hampshire calculator usually signals a snow day when about 8 or more inches fall overnight or during the 5–9 a.m. commute. The state averages near 71 inches a year — enter your town above for tomorrow's exact percent chance.
Snow day calculator
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Result
Your forecast appears here. Enter a ZIP code or city above and press Calculate snow day chance.
Fun estimate only — always follow your school district’s official announcements.
How New Hampshire districts decide snow days
Most Granite State districts build about five snow days into a 180-day calendar and start making calls between 5 and 5:30 a.m., after road crews test the routes. Weekend storms that end by Sunday night rarely close anything — plows get a full clear-in before Monday.
The state’s terrain creates sharp microclimates: a nor’easter can drop a foot in the White Mountain foothills while Nashua gets rain. New Hampshire superintendents therefore watch elevation-specific forecasts, and the same storm legitimately closes some towns and not their neighbors ten miles south.
Average snowfall in New Hampshire
| Place | Avg. snow per year |
|---|---|
| Concord | ≈ 64 in/yr |
| Manchester | ≈ 62 in/yr |
| Mt. Washington | ≈ 281 in/yr |
Averages are approximate NOAA/NCEI 1991–2020 climate normals, rounded. The Mount Washington figure is the summit observatory’s long-term average — the peak also recorded the world’s fastest wind, 231 mph, in April 1934.
The storm New Hampshire remembers
The Blizzard of 1978. The February 5–6, 1978 blizzard buried southern New Hampshire alongside Boston and Providence, dropping around two feet of snow with 70 mph gusts that stalled plows themselves. Schools across the region stayed closed for a week — the storm that New England superintendents still use as the measuring stick.
Using the calculator in New Hampshire
Snowday scores New Hampshire with an 8-inch closure baseline plus commute-timing and wind weighting. Open the snow day calculator, enter your ZIP code (03101 for Manchester, 03301 for Concord), and see tomorrow’s chance in seconds. For the full picture, open the snow day calculator and see how commute-hour snowfall, cold, and wind combine into tomorrow’s percent chance — free, instant, no sign-up.
Last updated: October 2026