Frost Dates for 13620 — Castorland, New York

Half of springs at Lowville, NY see their last 32°F night by May 8; only one in ten is past it by April 26, and one in ten still has one after May 23. Planting tender crops after May 15 leaves a 30% risk of a frost on them, after May 19 20%, and after May 23 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 1 in half of years, as early as September 19 one year in ten, and holds off past October 17 one year in ten. A hard freeze of 28°F follows 14 days later, around October 15; in spring the one-in-ten date for 28°F is May 11, 12 days before the 32°F one. The freeze-free season lasts 145 days in a typical year, shorter than at 80% of the 173 New York stations; it reaches 165 days one year in ten and falls short of 125 one year in ten. On average 165 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 May 22, and return around September 21. Severe cold of 16°F or below comes every winter, usually between November 19 and March 31.

July is the warmest month at Lowville, NY, averaging 78°F by day and 57°F at night; January is the coldest at 27°F and 8°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 76% of years.

Warmth for growing adds up to 2,047 growing degree days a year (base 50°F), fewer than at 88% of the 173 New York stations. 31% of them (633) have built up by the end of June, and July adds the most, 553. Precipitation totals 42.0 inches a year, most in October (4.6") and least in February (2.6"); May to September bring 43% of it.

The nearest other station, Watertown, NY, 22 miles west of Castorland and 366 feet lower, has a last frost 6 days earlier (May 2), a first frost 12 days later (October 13), a season 18 days longer.

The first measurable snow (0.1 inch or more) in Castorland usually arrives around November 14, and the last of the season around April 3. Those are the middle dates across the winters of 1991–2020 at Beaver Falls, NY, 1.5 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 35 days after the last snow.

ZIP 13620 is 8 miles from Lowville, NY, which stands at 863 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 13367 (Lowville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 13620 in zone 4b, the band where the coldest night of the year averaged -25 to -20°F (-31.7 to -28.9°C) over 1991–2020; a zone describes winter lows, not frost dates.