Frost Dates for 11767 — Nesconset, New York

Half of springs at Islip Li Macarthur Airport, NY see their last 32°F night by April 10; only one in ten is past it by March 31, and one in ten still has one after April 25. Planting tender crops after April 16 leaves a 30% risk of a frost on them, after April 20 20%, and after April 25 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 29% of the 173 New York stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 2 in half of years, as early as October 18 one year in ten, and holds off past November 15 one year in ten. A hard freeze of 28°F follows 12 days later, around November 14; in spring the one-in-ten date for 28°F is April 12, 13 days before the 32°F one. The freeze-free season lasts 207 days in a typical year, longer than at 90% of the 173 New York stations; it reaches 223 days one year in ten and falls short of 188 one year in ten. On average 98 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 April 23, and return around October 21. Severe cold of 16°F or below comes every winter, usually between December 28 and February 25.

July is the warmest month at Islip Li Macarthur Airport, NY, averaging 83°F by day and 67°F at night; January is the coldest at 39°F and 25°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 87% of years.

Warmth for growing adds up to 3,242 growing degree days a year (base 50°F), more than at 91% of the 173 New York stations. 30% of them (969) have built up by the end of June, and July adds the most, 776. Precipitation totals 46.1 inches a year, most in December (4.7") and least in February (3.3"); May to September bring 40% of it.

The nearest other station, Setauket Strong, NY, 8 miles north of Nesconset, has a last frost 5 days later (April 15), a first frost 8 days later (November 10), a season 1 day longer.

The first measurable snow (0.1 inch or more) in Nesconset usually arrives around December 11, and the last of the season around March 20. Those are the middle dates across the winters of 1991–2020 at Islip Li Macarthur Airport, NY, 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 21 days after the last snow.

ZIP 11767 is 4 miles from Islip Li Macarthur Airport, NY, which stands at 84 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 11772 (Patchogue). The 2023 USDA Plant Hardiness Zone Map lists ZIP 11767 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.