Frost Dates for 03827 — South Hampton, New Hampshire

Half of springs at Epping, NH see their last 32°F night by May 7; only one in ten is past it by April 25, and one in ten still has one after May 21. Planting tender crops after May 14 leaves a 30% risk of a frost on them, after May 17 20%, and after May 21 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 25% of the 51 New Hampshire stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 4 in half of years, as early as September 22 one year in ten, and holds off past October 17 one year in ten. A hard freeze of 28°F follows 11 days later, around October 15; in spring the one-in-ten date for 28°F is May 8, 13 days before the 32°F one. The freeze-free season lasts 148 days in a typical year, shorter than at 49% of the 51 New Hampshire stations; it reaches 166 days one year in ten and falls short of 130 one year in ten. On average 154 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 12 days longer, to about May 19, and return around September 25. Severe cold of 16°F or below comes every winter, usually between November 27 and March 20.

July is the warmest month at Epping, NH, averaging 82°F by day and 59°F at night; January is the coldest at 33°F and 14°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 72% of years.

Warmth for growing adds up to 2,417 growing degree days a year (base 50°F), more than at 65% of the 51 New Hampshire stations. 30% of them (727) have built up by the end of June, and July adds the most, 642. Precipitation totals 46.4 inches a year, most in October (4.7") and least in January (3.2"); May to September bring 41% of it.

The nearest other station, Greenland, NH, 11 miles northeast of South Hampton, has a last frost 3 days earlier (May 4), a first frost 4 days later (October 8), a season 9 days longer.

The first measurable snow (0.1 inch or more) in South Hampton usually arrives around December 3, and the last of the season around March 30. Those are the middle dates across the winters of 1991–2020 at Epping, NH, 9.4 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 38 days after the last snow.

ZIP 03827 is 9 miles from Epping, NH, which stands at 160 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 6 other ZIP codes share the station; its figures are presented in full for 03833 (Exeter). The 2023 USDA Plant Hardiness Zone Map lists ZIP 03827 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.