Frost Dates for 03773 — Newport, New Hampshire

Half of springs at Newport, NH see their last 32°F night by May 14; only one in ten is past it by April 30, and one in ten still has one after May 29. Planting tender crops after May 20 leaves a 30% risk of a frost on them, after May 23 20%, and after May 29 10%. The 15 days between the even-odds date and the one-in-ten date is wider than at 76% of the 51 New Hampshire stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 1 in half of years, as early as September 19 one year in ten, and holds off past October 12 one year in ten. A hard freeze of 28°F follows 10 days later, around October 11; in spring the one-in-ten date for 28°F is May 17, 12 days before the 32°F one. The freeze-free season lasts 140 days in a typical year, shorter than at 69% of the 51 New Hampshire stations; it reaches 158 days one year in ten and falls short of 121 one year in ten. On average 186 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 13 days longer, to about May 27, and return around September 21. Severe cold of 16°F or below comes every winter, usually between November 18 and March 31.

July is the warmest month at Newport, NH, averaging 80°F by day and 56°F at night; January is the coldest at 29°F and 9°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 88% of years.

Warmth for growing adds up to 2,021 growing degree days a year (base 50°F), fewer than at 76% of the 51 New Hampshire stations. 30% of them (601) have built up by the end of June, and July adds the most, 566. Precipitation totals 42.0 inches a year, most in October (4.9") and least in February (2.4"); May to September bring 45% of it.

The nearest other station, Mt Sunapee, NH, 6 miles east of Newport and 505 feet higher, has a last frost 12 days earlier (May 2), a first frost 8 days later (October 9), a season 18 days longer.

The first measurable snow (0.1 inch or more) in Newport usually arrives around November 18, and the last of the season around April 5. Those are the middle dates across the winters of 1991–2020 at Newport, NH, 1.3 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 39 days after the last snow.

ZIP 03773 is 1 mile from Newport, NH, which stands at 770 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 03743 (Claremont). The 2023 USDA Plant Hardiness Zone Map lists ZIP 03773 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.