Frost Dates for 17747 — Loganton, Pennsylvania

Half of springs at Lock Haven Sewage Plt, PA see their last 32°F night by April 30; only one in ten is past it by April 16, and one in ten still has one after May 15. Planting tender crops after May 6 leaves a 30% risk of a frost on them, after May 9 20%, and after May 15 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 72% of the 176 Pennsylvania stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 20 in half of years, as early as October 5 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 12 days later, around November 1; in spring the one-in-ten date for 28°F is May 1, 14 days before the 32°F one. The freeze-free season lasts 173 days in a typical year, shorter than at 53% of the 176 Pennsylvania stations; it reaches 192 days one year in ten and falls short of 150 one year in ten. On average 138 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 9 days longer, to about May 9, and return around October 7. Severe cold of 16°F or below comes every winter, usually between December 5 and March 13.

July is the warmest month at Lock Haven Sewage Plt, PA, averaging 85°F by day and 61°F at night; January is the coldest at 35°F and 18°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 45% of years.

Warmth for growing adds up to 2,948 growing degree days a year (base 50°F), fewer than at 51% of the 176 Pennsylvania stations. 34% of them (990) have built up by the end of June, and July adds the most, 713. Precipitation totals 41.9 inches a year, most in September (4.3") and least in February (2.2"); May to September bring 49% of it.

The nearest other station, Laurelton Ctr, PA, 10 miles southeast of Loganton and 234 feet higher, has a last frost 5 days earlier (April 25), a first frost 1 day earlier (October 19), a season 2 days longer.

The first measurable snow (0.1 inch or more) in Loganton usually arrives around November 28, and the last of the season around March 23. Those are the middle dates across the winters of 1991–2020 at Lock Haven Sewage Plt, PA, 9.5 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 38 days after the last snow.

ZIP 17747 is 10 miles from Lock Haven Sewage Plt, PA, which stands at 566 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 17745 (Lock Haven). The 2023 USDA Plant Hardiness Zone Map lists ZIP 17747 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.