Frost Dates for 17045 — Liverpool, Pennsylvania

Half of springs at Selinsgrove 2 S, PA see their last 32°F night by April 25; only one in ten is past it by April 9, and one in ten still has one after May 10. Planting tender crops after May 1 leaves a 30% risk of a frost on them, after May 6 20%, and after May 10 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 22 in half of years, as early as October 7 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 10 days later, around November 1; in spring the one-in-ten date for 28°F is April 25, 15 days before the 32°F one. The freeze-free season lasts 178 days in a typical year, longer than at 61% of the 176 Pennsylvania stations; it reaches 198 days one year in ten and falls short of 156 one year in ten. On average 131 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 11 days longer, to about May 6, and return around October 9. Severe cold of 16°F or below comes every winter, usually between December 6 and March 12.

July is the warmest month at Selinsgrove 2 S, PA, averaging 85°F by day and 62°F at night; January is the coldest at 36°F and 19°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 32% of years.

Warmth for growing adds up to 3,005 growing degree days a year (base 50°F), more than at 51% of the 176 Pennsylvania stations. 33% of them (999) have built up by the end of June, and July adds the most, 732. Precipitation totals 43.3 inches a year, most in June (4.4") and least in February (2.3"); May to September bring 48% of it.

The nearest other station, Dehart Dam, PA, 16 miles southeast of Liverpool, has a last frost 6 days later (May 1), a first frost 6 days earlier (October 16), a season 10 days shorter.

The first measurable snow (0.1 inch or more) in Liverpool usually arrives around December 8, and the last of the season around March 23. Those are the middle dates across the winters of 1991–2020 at Selinsgrove 2 S, PA, 15.2 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 33 days after the last snow.

ZIP 17045 is 15 miles from Selinsgrove 2 S, PA, which stands at 420 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 17062 (Millerstown). The 2023 USDA Plant Hardiness Zone Map lists ZIP 17045 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.