Frost Dates for 16365 — Warren, Pennsylvania

Half of springs at Warren, PA see their last 32°F night by May 4; only one in ten is past it by April 20, and one in ten still has one after May 22. Planting tender crops after May 11 leaves a 30% risk of a frost on them, after May 16 20%, and after May 22 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 21 in half of years, as early as October 6 one year in ten, and holds off past November 4 one year in ten. A hard freeze of 28°F follows 12 days later, around November 2; in spring the one-in-ten date for 28°F is May 11, 11 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 188 days one year in ten and falls short of 147 one year in ten. On average 141 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 15, and return around October 8. Severe cold of 16°F or below comes every winter, usually between December 7 and March 20.

July is the warmest month at Warren, PA, averaging 81°F by day and 59°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 59% of years.

Warmth for growing adds up to 2,568 growing degree days a year (base 50°F), fewer than at 74% of the 176 Pennsylvania stations. 32% of them (830) have built up by the end of June, and July adds the most, 620. Precipitation totals 47.1 inches a year, most in July (4.8") and least in February (2.8"); May to September bring 46% of it.

The nearest other station, Chandlers Valley 1SE, PA, 9 miles northwest of Warren and 280 feet higher, has a last frost 18 days later (May 22), a first frost 21 days earlier (September 30), a season 37 days shorter.

The first measurable snow (0.1 inch or more) in Warren usually arrives around November 14, and the last of the season around April 4. Those are the middle dates across the winters of 1991–2020 at Warren, PA, 0.5 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 30 days after the last snow.

ZIP 16365 is under a mile from Warren, PA, which stands at 1,210 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 16365 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.