Frost Dates for 11933 — Calverton, New York

Half of springs at Baiting Hollow, NY see their last 32°F night by April 24; only one in ten is past it by April 10, and one in ten still has one after May 9. Planting tender crops after May 2 leaves a 30% risk of a frost on them, after May 5 20%, and after May 9 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 October 25 in half of years, as early as October 11 one year in ten, and holds off past November 7 one year in ten. A hard freeze of 28°F follows 11 days later, around November 5; in spring the one-in-ten date for 28°F is April 24, 15 days before the 32°F one. The freeze-free season lasts 182 days in a typical year, longer than at 77% of the 173 New York stations; it reaches 202 days one year in ten and falls short of 160 one year in ten. On average 116 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 7, and return around October 12. Severe cold of 16°F or below comes every winter, usually between December 16 and March 7.

July is the warmest month at Baiting Hollow, NY, averaging 83°F by day and 63°F at night; January is the coldest at 38°F and 22°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 33% of years.

Warmth for growing adds up to 2,817 growing degree days a year (base 50°F), more than at 76% of the 173 New York stations. 29% of them (803) have built up by the end of June, and July adds the most, 701. Precipitation totals 48.6 inches a year, most in December (5.1") and least in February (2.7"); May to September bring 39% of it.

The nearest other station, Riverhead Rsch Farm, NY, 3 miles northeast of Calverton, has a last frost 18 days earlier (April 6), a first frost 15 days later (November 9), a season 33 days longer.

The first measurable snow (0.1 inch or more) in Calverton usually arrives around December 17, and the last of the season around March 18. Those are the middle dates across the winters of 1991–2020 at Riverhead Rsch Farm, NY, 2.6 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 37 days after the last snow.

ZIP 11933 is under a mile from Baiting Hollow, NY, which stands at 70 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 11792 (Wading River). The 2023 USDA Plant Hardiness Zone Map lists ZIP 11933 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.