Frost Dates for 18925 — Furlong, Pennsylvania

Half of springs at Doylestown Airport, PA see their last 32°F night by April 13; only one in ten is past it by April 1, and one in ten still has one after April 27. Planting tender crops after April 19 leaves a 30% risk of a frost on them, after April 22 20%, and after April 27 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 86% of the 176 Pennsylvania stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 30 in half of years, as early as October 15 one year in ten, and holds off past November 12 one year in ten. A hard freeze of 28°F follows 11 days later, around November 10; in spring the one-in-ten date for 28°F is April 14, 13 days before the 32°F one. The freeze-free season lasts 198 days in a typical year, longer than at 88% of the 176 Pennsylvania stations; it reaches 217 days one year in ten and falls short of 176 one year in ten. On average 106 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 14 days longer, to about April 27, and return around October 18. Severe cold of 16°F or below comes every winter, usually between December 22 and February 28.

July is the warmest month at Doylestown Airport, PA, averaging 86°F by day and 65°F at night; January is the coldest at 39°F and 23°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month.

Warmth for growing adds up to 3,410 growing degree days a year (base 50°F), more than at 86% of the 176 Pennsylvania stations. 33% of them (1,142) have built up by the end of June, and July adds the most, 786. Precipitation totals 48.0 inches a year, most in July (5.5") and least in February (2.5"); May to September bring 49% of it.

The nearest other station, Willow Grove NAS, PA, 7 miles southwest of Furlong, has a last frost 2 days earlier (April 11), a first frost 2 days later (November 1), a season 7 days longer.

The first measurable snow (0.1 inch or more) in Furlong usually arrives around December 26, and the last of the season around March 21. Those are the middle dates across the winters of 1991–2020 at Willow Grove NAS, PA, 7.3 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 23 days after the last snow.

ZIP 18925 is 5 miles from Doylestown Airport, PA, which stands at 394 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 5 other ZIP codes share the station; its figures are presented in full for 18901 (Doylestown). The 2023 USDA Plant Hardiness Zone Map lists ZIP 18925 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.