Frost Dates for 14487 — Livonia, New York

Half of springs at Hemlock, NY see their last 32°F night by May 2; only one in ten is past it by April 22, and one in ten still has one after May 16. Planting tender crops after May 8 leaves a 30% risk of a frost on them, after May 12 20%, and after May 16 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 18 in half of years, as early as October 2 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 14 days later, around November 1; in spring the one-in-ten date for 28°F is May 6, 10 days before the 32°F one. The freeze-free season lasts 167 days in a typical year, longer than at 60% of the 173 New York stations; it reaches 187 days one year in ten and falls short of 146 one year in ten. On average 138 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 10 days longer, to about May 12, and return around October 5. Severe cold of 16°F or below comes every winter, usually between December 2 and March 25.

July is the warmest month at Hemlock, NY, averaging 81°F by day and 60°F at night; January is the coldest at 33°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 58% of years.

Warmth for growing adds up to 2,574 growing degree days a year (base 50°F), more than at 57% of the 173 New York stations. 32% of them (820) have built up by the end of June, and July adds the most, 634. Precipitation totals 37.3 inches a year, most in July (4.2") and least in February (1.8"); May to September bring 50% of it.

The nearest other station, Honeoye, NY, 7 miles east of Livonia, has a last frost 8 days later (May 10), a first frost 14 days earlier (October 4), a season 20 days shorter.

The first measurable snow (0.1 inch or more) in Livonia usually arrives around November 17, and the last of the season around April 3. Those are the middle dates across the winters of 1991–2020 at Honeoye, 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 29 days after the last snow.

ZIP 14487 is 3 miles from Hemlock, NY, which stands at 902 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 14487 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.