Frost Dates for 15370 — Waynesburg, Pennsylvania

Half of springs at Waynesburg 1 E, PA see their last 32°F night by May 3; only one in ten is past it by April 19, and one in ten still has one after May 21. Planting tender crops after May 11 leaves a 30% risk of a frost on them, after May 15 20%, and after May 21 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 15 in half of years, as early as October 2 one year in ten, and holds off past October 28 one year in ten. A hard freeze of 28°F follows 10 days later, around October 25; in spring the one-in-ten date for 28°F is May 11, 10 days before the 32°F one. The freeze-free season lasts 164 days in a typical year, shorter than at 68% of the 176 Pennsylvania stations; it reaches 182 days one year in ten and falls short of 142 one year in ten. On average 138 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 14, and return around October 5. Severe cold of 16°F or below comes every winter, usually between November 29 and March 14.

July is the warmest month at Waynesburg 1 E, PA, averaging 83°F by day and 60°F at night; January is the coldest at 39°F and 19°F. A freezing night is all but certain in every month from October 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 57% of years.

Warmth for growing adds up to 2,943 growing degree days a year (base 50°F), fewer than at 52% of the 176 Pennsylvania stations. 34% of them (1,014) have built up by the end of June, and July adds the most, 679. Precipitation totals 43.0 inches a year, most in May (4.3") and least in February (2.8"); May to September bring 47% of it.

The nearest other station, Grays Landing, PA, 16 miles southeast of Waynesburg, has a last frost 5 days earlier (April 28), a first frost 6 days later (October 21), a season 11 days longer.

The first measurable snow (0.1 inch or more) in Waynesburg usually arrives around December 2, and the last of the season around March 16. Those are the middle dates across the winters of 1991–2020 at Waynesburg 1 E, PA, 0.9 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 48 days after the last snow.

ZIP 15370 is under a mile from Waynesburg 1 E, PA, which stands at 940 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 15370 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.