Frost Dates for 12919 — Champlain, New York

Half of springs at Chazy, NY see their last 32°F night by April 30; only one in ten is past it by April 17, and one in ten still has one after May 14. Planting tender crops after May 5 leaves a 30% risk of a frost on them, after May 8 20%, and after May 14 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 63% of the 173 New York stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 12 in half of years, as early as September 29 one year in ten, and holds off past October 30 one year in ten. A hard freeze of 28°F follows 13 days later, around October 25; in spring the one-in-ten date for 28°F is May 2, 12 days before the 32°F one. The freeze-free season lasts 164 days in a typical year, longer than at 54% of the 173 New York stations; it reaches 184 days one year in ten and falls short of 144 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 11 days longer, to about May 11, and return around October 1. Severe cold of 16°F or below comes every winter, usually between November 23 and March 26.

July is the warmest month at Chazy, NY, averaging 82°F by day and 63°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 46% of years.

Warmth for growing adds up to 2,648 growing degree days a year (base 50°F), more than at 62% of the 173 New York stations. 32% of them (852) have built up by the end of June, and July adds the most, 686.

The nearest other station, St Albans Radio, VT, 18 miles southeast of Champlain and 223 feet higher, has a last frost 1 day later (May 1), the same first-frost date, a season 3 days shorter.

The first measurable snow (0.1 inch or more) in Champlain usually arrives around November 12, and the last of the season around April 8. Those are the middle dates across the winters of 1991–2020 at Chazy, NY, 6.4 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 22 days after the last snow.

ZIP 12919 is 6 miles from Chazy, NY, which stands at 157 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station; its figures are presented in full for 12992 (West Chazy). The 2023 USDA Plant Hardiness Zone Map lists ZIP 12919 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.