Frost Dates for 13408 — Morrisville, New York

Half of springs at Morrisville 6 SW, NY see their last 32°F night by May 6; only one in ten is past it by April 25, and one in ten still has one after May 21. Planting tender crops after May 12 leaves a 30% risk of a frost on them, after May 17 20%, and after May 21 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 9 in half of years, as early as September 28 one year in ten, and holds off past October 25 one year in ten. A hard freeze of 28°F follows 13 days later, around October 22; in spring the one-in-ten date for 28°F is May 9, 12 days before the 32°F one. The freeze-free season lasts 156 days in a typical year, shorter than at 61% of the 173 New York stations; it reaches 173 days one year in ten and falls short of 137 one year in ten. On average 158 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 13 days longer, to about May 19, and return around October 1. Severe cold of 16°F or below comes every winter, usually between November 23 and March 31.

July is the warmest month at Morrisville 6 SW, NY, averaging 77°F by day and 57°F at night; January is the coldest at 28°F and 11°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 69% of years.

Warmth for growing adds up to 2,030 growing degree days a year (base 50°F), fewer than at 92% of the 173 New York stations. 31% of them (631) have built up by the end of June, and July adds the most, 536. Precipitation totals 48.4 inches a year, most in June (4.6") and least in February (3.2"); May to September bring 45% of it.

The nearest other station, Sherburne, NY, 19 miles southeast of Morrisville and 586 feet lower, has a last frost 7 days later (May 13), a first frost 5 days earlier (October 4), a season 11 days shorter.

The first measurable snow (0.1 inch or more) in Morrisville usually arrives around October 26, and the last of the season around April 22. Those are the middle dates across the winters of 1991–2020 at Morrisville 6 SW, NY, 6.5 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 14 days after the last snow.

ZIP 13408 is 7 miles from Morrisville 6 SW, NY, which stands at 1,681 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 13032 (Canastota). The 2023 USDA Plant Hardiness Zone Map lists ZIP 13408 in zone 5b, the band where the coldest night of the year averaged -15 to -10°F (-26.1 to -23.3°C) over 1991–2020; a zone describes winter lows, not frost dates.