Frost Dates for 16950 — Westfield, Pennsylvania

Half of springs at Wellsboro 4 SW, PA see their last 32°F night by May 10; only one in ten is past it by April 25, and one in ten still has one after May 26. Planting tender crops after May 17 leaves a 30% risk of a frost on them, after May 21 20%, and after May 26 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 51% of the 176 Pennsylvania stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 5 in half of years, as early as September 23 one year in ten, and holds off past October 20 one year in ten. A hard freeze of 28°F follows 12 days later, around October 17; in spring the one-in-ten date for 28°F is May 15, 11 days before the 32°F one. The freeze-free season lasts 148 days in a typical year, shorter than at 89% of the 176 Pennsylvania stations; it reaches 167 days one year in ten and falls short of 128 one year in ten. On average 159 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 23, and return around September 26. Severe cold of 16°F or below comes every winter, usually between November 25 and March 26.

July is the warmest month at Wellsboro 4 SW, PA, averaging 79°F by day and 57°F at night; January is the coldest at 30°F and 14°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 78% of years.

Warmth for growing adds up to 2,091 growing degree days a year (base 50°F), fewer than at 93% of the 176 Pennsylvania stations. 32% of them (670) have built up by the end of June, and July adds the most, 552. Precipitation totals 42.5 inches a year, most in June (4.3") and least in February (2.5"); May to September bring 47% of it.

The nearest other station, Tioga Hammond Dam, PA, 20 miles east of Westfield and 588 feet lower, has a last frost 4 days earlier (May 6), a first frost 5 days later (October 10), a season 10 days longer.

The first measurable snow (0.1 inch or more) in Westfield usually arrives around November 17, and the last of the season around April 1. Those are the middle dates across the winters of 1991–2020 at Sabinsville 3 SE, PA, 4.4 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 39 days after the last snow.

ZIP 16950 is 15 miles from Wellsboro 4 SW, PA, which stands at 1,818 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 16901 (Wellsboro). The 2023 USDA Plant Hardiness Zone Map lists ZIP 16950 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.