Frost Dates for 16748 — Shinglehouse, Pennsylvania

Half of springs at Oswayo 1 ENE, PA see their last 32°F night by May 20; only one in ten is past it by May 5, and one in ten still has one after June 2. Planting tender crops after May 27 leaves a 30% risk of a frost on them, after May 30 20%, and after June 2 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 94% of the 176 Pennsylvania stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 29 in half of years, as early as September 14 one year in ten, and holds off past October 10 one year in ten. A hard freeze of 28°F follows 10 days later, around October 9; in spring the one-in-ten date for 28°F is May 25, 8 days before the 32°F one. The freeze-free season lasts 130 days in a typical year, shorter than at 99% of the 176 Pennsylvania stations; it reaches 150 days one year in ten and falls short of 109 one year in ten. On average 175 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 June 2, and return around September 17. Severe cold of 16°F or below comes every winter, usually between November 16 and April 4.

July is the warmest month at Oswayo 1 ENE, PA, averaging 79°F by day and 53°F at night; January is the coldest at 30°F and 11°F. A freezing night is all but certain in every month from October to May (a 90% chance or more). From July to August the chance of a 32°F night stays under 10% each month. In spring, June still brings one in 15% of years.

Warmth for growing adds up to 1,860 growing degree days a year (base 50°F), fewer than at 99% of the 176 Pennsylvania stations. 32% of them (596) have built up by the end of June, and July adds the most, 493. Precipitation totals 43.3 inches a year, most in July (4.6") and least in February (2.2"); May to September bring 49% of it.

The nearest other station, Port Allegany, PA, 11 miles southwest of Shinglehouse and 235 feet lower, has a last frost 5 days earlier (May 15), a first frost 7 days later (October 6), a season 14 days longer.

The first measurable snow (0.1 inch or more) in Shinglehouse usually arrives around November 15, and the last of the season around April 7. Those are the middle dates across the winters of 1991–2020 at Oswayo 1 ENE, PA, 8 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 43 days after the last snow.

ZIP 16748 is 8 miles from Oswayo 1 ENE, PA, which stands at 1,710 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 16748 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.