Frost Dates for 18072 — Pen Argyl, Pennsylvania

Half of springs at Belvidere Brg, NJ 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 11 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 18 in half of years, as early as October 3 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 11 days later, around October 29; in spring the one-in-ten date for 28°F is May 5, 13 days before the 32°F one. The freeze-free season lasts 168 days in a typical year, shorter than at 63% of the 176 Pennsylvania stations; it reaches 191 days one year in ten and falls short of 145 one year in ten. On average 135 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 12 days longer, to about May 12, and return around October 6. Severe cold of 16°F or below comes every winter, usually between December 3 and March 10.

July is the warmest month at Belvidere Brg, NJ, averaging 84°F by day and 61°F at night; January is the coldest at 37°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 2,807 growing degree days a year (base 50°F), fewer than at 61% of the 176 Pennsylvania stations. 32% of them (884) have built up by the end of June, and July adds the most, 691. Precipitation totals 48.3 inches a year, most in July (4.8") and least in February (2.7"); May to September bring 47% of it.

The nearest other station, E Stroudsburg, PA, 11 miles north of Pen Argyl and 208 feet higher, has a last frost 1 day later (May 1), a first frost 6 days earlier (October 12), a season 5 days shorter.

The first measurable snow (0.1 inch or more) in Pen Argyl usually arrives around December 17, and the last of the season around March 9. Those are the middle dates across the winters of 1991–2020 at Belvidere Brg, NJ, 9.3 miles away: half of years saw snow earlier, half later. Snow fell in 97% of those winters. The last 32°F night of spring typically comes 52 days after the last snow.

ZIP 18072 is 9 miles from Belvidere Brg, NJ, which stands at 263 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 9 other ZIP codes share the station; its figures are presented in full for 18013 (Bangor). The 2023 USDA Plant Hardiness Zone Map lists ZIP 18072 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.