Frost Dates for 01835 — Haverhill, Massachusetts

Half of springs at Haverhill, MA see their last 32°F night by May 1; only one in ten is past it by April 20, and one in ten still has one after May 14. Planting tender crops after May 5 leaves a 30% risk of a frost on them, after May 9 20%, and after May 14 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 51% of the 71 Massachusetts stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 12 in half of years, as early as October 1 one year in ten, and holds off past October 28 one year in ten. A hard freeze of 28°F follows 11 days later, around October 23; in spring the one-in-ten date for 28°F is May 1, 13 days before the 32°F one. The freeze-free season lasts 163 days in a typical year, shorter than at 63% of the 71 Massachusetts stations; it reaches 183 days one year in ten and falls short of 144 one year in ten. On average 143 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 11 days longer, to about May 12, and return around October 3. Severe cold of 16°F or below comes every winter, usually between December 2 and March 15.

July is the warmest month at Haverhill, MA, averaging 82°F by day and 61°F at night; January is the coldest at 35°F and 16°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 52% of years.

Warmth for growing adds up to 2,524 growing degree days a year (base 50°F), fewer than at 68% of the 71 Massachusetts stations. 29% of them (732) have built up by the end of June, and July adds the most, 674. Precipitation totals 49.6 inches a year, most in October (5.3") and least in January (3.5"); May to September bring 40% of it.

The nearest other station, Groveland, MA, 2 miles east of Haverhill, has a last frost 2 days later (May 3), a first frost 4 days earlier (October 8), a season 5 days shorter.

The first measurable snow (0.1 inch or more) in Haverhill usually arrives around December 3, and the last of the season around March 29. Those are the middle dates across the winters of 1991–2020 at Haverhill, MA, 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 33 days after the last snow.

ZIP 01835 is 1 mile from Haverhill, MA, which stands at 20 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 01830 (Haverhill). The 2023 USDA Plant Hardiness Zone Map lists ZIP 01835 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.