Frost Dates for 10453 — Bronx, New York

Half of springs at Bronx, NY see their last 32°F night by April 1; only one in ten is past it by March 19, and one in ten still has one after April 12. Planting tender crops after April 5 leaves a 30% risk of a frost on them, after April 8 20%, and after April 12 10%. The 11 days between the even-odds date and the one-in-ten date is narrower than at 97% of the 173 New York stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 16 in half of years, as early as November 2 one year in ten, and holds off past December 4 one year in ten. A hard freeze of 28°F follows 14 days later, around November 30; in spring the one-in-ten date for 28°F is April 3, 9 days before the 32°F one. The freeze-free season lasts 230 days in a typical year, longer than at 98% of the 173 New York stations; it reaches 250 days one year in ten and falls short of 211 one year in ten. On average 67 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 April 11, and return around November 4. Severe cold of 16°F or below comes in 97% of winters, usually between January 5 and February 14.

July is the warmest month at Bronx, NY, averaging 86°F by day and 71°F at night; January is the coldest at 40°F and 27°F. A freezing night is all but certain in every month from December to March (a 90% chance or more). From May to October the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 56% of years.

Warmth for growing adds up to 3,914 growing degree days a year (base 50°F), more than at 99% of the 173 New York stations. 33% of them (1,279) have built up by the end of June, and July adds the most, 879. Precipitation totals 50.1 inches a year, most in August (4.8") and least in February (3.2"); May to September bring 45% of it.

The nearest other station, New York Laguardia Airport, NY, 5 miles south of Bronx, has a last frost 6 days earlier (March 26), a first frost 9 days later (November 25), a season 14 days longer.

The first measurable snow (0.1 inch or more) in Bronx usually arrives around December 9, and the last of the season around March 19. Those are the middle dates across the winters of 1991–2020 at New York Laguardia Airport, NY, 5.4 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 13 days after the last snow.

ZIP 10453 is 4 miles from Bronx, NY, which stands at 39 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 33 other ZIP codes share the station; its figures are presented in full for 10467 (Bronx). The 2023 USDA Plant Hardiness Zone Map lists ZIP 10453 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.