Frost Dates for 12944 — Keeseville, New York

Half of springs at Peru 2 WSW, NY see their last 32°F night by May 4; only one in ten is past it by April 24, and one in ten still has one after May 17. Planting tender crops after May 10 leaves a 30% risk of a frost on them, after May 13 20%, and after May 17 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 4 in half of years, as early as September 23 one year in ten, and holds off past October 20 one year in ten. A hard freeze of 28°F follows 13 days later, around October 17; in spring the one-in-ten date for 28°F is May 5, 12 days before the 32°F one. The freeze-free season lasts 152 days in a typical year, shorter than at 69% of the 173 New York stations; it reaches 170 days one year in ten and falls short of 133 one year in ten. On average 152 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 16, and return around September 26. Severe cold of 16°F or below comes every winter, usually between November 20 and March 29.

July is the warmest month at Peru 2 WSW, NY, averaging 82°F by day and 60°F at night; January is the coldest at 28°F and 10°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 66% of years.

Warmth for growing adds up to 2,474 growing degree days a year (base 50°F), fewer than at 52% of the 173 New York stations. 32% of them (804) have built up by the end of June, and July adds the most, 642.

The nearest other station, Willsboro 1 N, NY, 8 miles southeast of Keeseville and 330 feet lower, has a last frost 2 days earlier (May 2), a first frost 10 days later (October 14), a season 13 days longer.

The first measurable snow (0.1 inch or more) in Keeseville usually arrives around November 14, and the last of the season around April 6. Those are the middle dates across the winters of 1991–2020 at Peru 2 WSW, NY, 7.2 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 28 days after the last snow.

ZIP 12944 is 7 miles from Peru 2 WSW, NY, which stands at 510 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 12972 (Peru). The 2023 USDA Plant Hardiness Zone Map lists ZIP 12944 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.