Frost Dates for 08879 — South Amboy, New Jersey

Half of springs at New Brunswick 3 SE, NJ see their last 32°F night by April 15; only one in ten is past it by April 2, and one in ten still has one after May 1. Planting tender crops after April 21 leaves a 30% risk of a frost on them, after April 25 20%, and after May 1 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 26 in half of years, as early as October 11 one year in ten, and holds off past November 8 one year in ten. A hard freeze of 28°F follows 12 days later, around November 7; in spring the one-in-ten date for 28°F is April 17, 14 days before the 32°F one. The freeze-free season lasts 193 days in a typical year, longer than at 50% of the 56 New Jersey stations; it reaches 214 days one year in ten and falls short of 171 one year in ten. On average 111 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 14 days longer, to about April 29, and return around October 14. Severe cold of 16°F or below comes every winter, usually between December 21 and February 28.

July is the warmest month at New Brunswick 3 SE, NJ, averaging 87°F by day and 66°F at night; January is the coldest at 40°F and 23°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 11% of years.

Warmth for growing adds up to 3,486 growing degree days a year (base 50°F), more than at 50% of the 56 New Jersey stations. 33% of them (1,138) have built up by the end of June, and July adds the most, 807. Precipitation totals 49.5 inches a year, most in June (4.8") and least in February (3.0"); May to September bring 45% of it.

The nearest other station, Freehold-Marlboro, NJ, 11 miles south of South Amboy, has a last frost 2 days later (April 17), a first frost 3 days earlier (October 23), a season 3 days shorter.

The first measurable snow (0.1 inch or more) in South Amboy usually arrives around December 10, and the last of the season around March 21. Those are the middle dates across the winters of 1991–2020 at New Brunswick 3 SE, NJ, 7.7 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 25 days after the last snow.

ZIP 08879 is 8 miles from New Brunswick 3 SE, NJ, which stands at 111 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 18 other ZIP codes share the station; its figures are presented in full for 08861 (Perth Amboy). The 2023 USDA Plant Hardiness Zone Map lists ZIP 08879 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.