Frost Dates for 10970 — Pomona, New York

Half of springs at Yorktown Hts 1W, NY see their last 32°F night by April 25; only one in ten is past it by April 13, and one in ten still has one after May 8. Planting tender crops after May 1 leaves a 30% risk of a frost on them, after May 4 20%, and after May 8 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 83% of the 173 New York 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 4 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 13 days later, around November 1; in spring the one-in-ten date for 28°F is April 26, 12 days before the 32°F one. The freeze-free season lasts 174 days in a typical year, longer than at 72% of the 173 New York stations; it reaches 193 days one year in ten and falls short of 155 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 12 days longer, to about May 7, and return around October 7. Severe cold of 16°F or below comes every winter, usually between December 4 and March 16.

July is the warmest month at Yorktown Hts 1W, NY, averaging 83°F by day and 61°F at night; January is the coldest at 36°F and 17°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 30% of years.

Warmth for growing adds up to 2,692 growing degree days a year (base 50°F), more than at 67% of the 173 New York stations. 31% of them (842) have built up by the end of June, and July adds the most, 679. Precipitation totals 50.3 inches a year, most in June (5.0") and least in February (3.1"); May to September bring 44% of it.

The nearest other station, West Point, NY, 14 miles north of Pomona and 350 feet lower, has a last frost 15 days earlier (April 10), a first frost 13 days later (November 1), a season 30 days longer.

The first measurable snow (0.1 inch or more) in Pomona usually arrives around December 6, and the last of the season around March 22. Those are the middle dates across the winters of 1991–2020 at Yorktown Hts 1W, NY, 13.9 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 34 days after the last snow.

ZIP 10970 is 14 miles from Yorktown Hts 1W, NY, which stands at 670 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 16 other ZIP codes share the station; its figures are presented in full for 10562 (Ossining). The 2023 USDA Plant Hardiness Zone Map lists ZIP 10970 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.