Frost Dates for 07876 — Succasunna, New Jersey

Half of springs at Andover Aeroflex Airport, NJ see their last 32°F night by April 25; only one in ten is past it by April 12, and one in ten still has one after May 11. Planting tender crops after May 2 leaves a 30% risk of a frost on them, after May 6 20%, and after May 11 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 38% of the 56 New Jersey stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 19 in half of years, as early as October 5 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 12 days later, around October 31; in spring the one-in-ten date for 28°F is April 28, 13 days before the 32°F one. The freeze-free season lasts 175 days in a typical year, shorter than at 86% of the 56 New Jersey stations; it reaches 198 days one year in ten and falls short of 153 one year in ten. On average 127 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 7, and return around October 6. Severe cold of 16°F or below comes every winter, usually between December 7 and March 10.

July is the warmest month at Andover Aeroflex Airport, NJ, averaging 84°F by day and 62°F at night; January is the coldest at 36°F and 19°F. A freezing night is all but certain in every month from November 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 35% of years.

Warmth for growing adds up to 2,877 growing degree days a year (base 50°F), fewer than at 91% of the 56 New Jersey stations. 33% of them (960) have built up by the end of June, and July adds the most, 704. Precipitation totals 48.8 inches a year, most in July (5.1") and least in February (2.8"); May to September bring 46% of it.

The nearest other station, Boonton 1 SE, NJ, 14 miles east of Succasunna and 303 feet lower, has a last frost 8 days earlier (April 17), a first frost 4 days later (October 23), a season 14 days longer.

The first measurable snow (0.1 inch or more) in Succasunna usually arrives around December 22, and the last of the season around March 21. Those are the middle dates across the winters of 1991–2020 at Pottersville 2 NNW, NJ, 9.2 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 35 days after the last snow.

ZIP 07876 is 12 miles from Andover Aeroflex Airport, NJ, which stands at 583 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 12 other ZIP codes share the station; its figures are presented in full for 07840 (Hackettstown). The 2023 USDA Plant Hardiness Zone Map lists ZIP 07876 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.