Frost Dates for 17931 — Frackville, Pennsylvania

Half of springs at Mahanoy City 2 N, PA see their last 32°F night by April 30; only one in ten is past it by April 15, and one in ten still has one after May 18. Planting tender crops after May 7 leaves a 30% risk of a frost on them, after May 12 20%, and after May 18 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 70% 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 May 6, 12 days before the 32°F one. The freeze-free season lasts 175 days in a typical year, shorter than at 48% of the 176 Pennsylvania stations; it reaches 195 days one year in ten and falls short of 152 one year in ten. On average 139 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 11, and return around October 10. Severe cold of 16°F or below comes every winter, usually between December 4 and March 17.

July is the warmest month at Mahanoy City 2 N, PA, averaging 80°F by day and 61°F at night; January is the coldest at 33°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 49% of years.

Warmth for growing adds up to 2,499 growing degree days a year (base 50°F), fewer than at 78% of the 176 Pennsylvania stations. 32% of them (806) have built up by the end of June, and July adds the most, 632. Precipitation totals 53.7 inches a year, most in July (5.2") and least in February (3.0"); May to September bring 46% of it.

The nearest other station, Bear Gap, PA, 14 miles west of Frackville and 695 feet lower, has a last frost 3 days earlier (April 27), a first frost 2 days earlier (October 20), a season 3 days shorter.

The first measurable snow (0.1 inch or more) in Frackville usually arrives around November 24, and the last of the season around April 1. Those are the middle dates across the winters of 1991–2020 at Mahanoy City 2 N, PA, 5.9 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 29 days after the last snow.

ZIP 17931 is 6 miles from Mahanoy City 2 N, PA, which stands at 1,710 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 13 other ZIP codes share the station; its figures are presented in full for 18201 (Hazleton). The 2023 USDA Plant Hardiness Zone Map lists ZIP 17931 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.