Frost Dates for 10701 — Yonkers, New York

Half of springs at Dobbs Ferry-Ardsley, NY see their last 32°F night by April 20; only one in ten is past it by April 4, and one in ten still has one after May 6. Planting tender crops after April 27 leaves a 30% risk of a frost on them, after April 30 20%, and after May 6 10%. The 16 days between the even-odds date and the one-in-ten date is wider than at 71% of the 173 New York stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 26 in half of years, as early as October 10 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 12 days later, around November 7; in spring the one-in-ten date for 28°F is April 20, 16 days before the 32°F one. The freeze-free season lasts 189 days in a typical year, longer than at 86% of the 173 New York stations; it reaches 210 days one year in ten and falls short of 168 one year in ten. On average 109 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 2, and return around October 12. Severe cold of 16°F or below comes every winter, usually between December 20 and February 28.

July is the warmest month at Dobbs Ferry-Ardsley, NY, averaging 86°F by day and 64°F at night; January is the coldest at 40°F and 23°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 20% of years.

Warmth for growing adds up to 3,333 growing degree days a year (base 50°F), more than at 94% of the 173 New York stations. 33% of them (1,088) have built up by the end of June, and July adds the most, 775. Precipitation totals 51.3 inches a year, most in December (4.7") and least in February (3.3"); May to September bring 44% of it.

The nearest other station, Bronx, NY, 8 miles south of Yonkers and 161 feet lower, has a last frost 19 days earlier (April 1), a first frost 21 days later (November 16), a season 41 days longer.

The first measurable snow (0.1 inch or more) in Yonkers usually arrives around December 11, and the last of the season around March 21. Those are the middle dates across the winters of 1991–2020 at Dobbs Ferry-Ardsley, NY, 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 30 days after the last snow.

ZIP 10701 is 5 miles from Dobbs Ferry-Ardsley, NY, which stands at 200 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 43 other ZIP codes share the station; its figures are presented in full for 10977 (Spring Valley). The 2023 USDA Plant Hardiness Zone Map lists ZIP 10701 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.