Frost Dates for 18426 — Greentown, Pennsylvania

Half of springs at Hawley 1 E, PA see their last 32°F night by May 10; only one in ten is past it by April 26, 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 4 in half of years, as early as September 21 one year in ten, and holds off past October 18 one year in ten. A hard freeze of 28°F follows 12 days later, around October 16; in spring the one-in-ten date for 28°F is May 13, 13 days before the 32°F one. The freeze-free season lasts 146 days in a typical year, shorter than at 89% of the 176 Pennsylvania stations; it reaches 166 days one year in ten and falls short of 126 one year in ten. On average 164 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 24. Severe cold of 16°F or below comes every winter, usually between November 22 and March 23.

July is the warmest month at Hawley 1 E, PA, averaging 81°F by day and 57°F at night; January is the coldest at 33°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 77% of years.

Warmth for growing adds up to 2,235 growing degree days a year (base 50°F), fewer than at 88% of the 176 Pennsylvania stations. 32% of them (709) have built up by the end of June, and July adds the most, 590. Precipitation totals 45.2 inches a year, most in June (4.7") and least in February (2.7"); May to September bring 46% of it.

The nearest other station, Mt Pocono Mountains Airport, PA, 15 miles south of Greentown and 1,026 feet higher, has a last frost 4 days earlier (May 6), a first frost 4 days later (October 8), a season 8 days longer.

The first measurable snow (0.1 inch or more) in Greentown usually arrives around December 6, and the last of the season around March 22. Those are the middle dates across the winters of 1991–2020 at Hawley 1 E, PA, 11.1 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 49 days after the last snow.

ZIP 18426 is 11 miles from Hawley 1 E, PA, which stands at 890 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 18436 (Lake Ariel). The 2023 USDA Plant Hardiness Zone Map lists ZIP 18426 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.