Frost Dates for 15618 — Avonmore, Pennsylvania

Half of springs at Salina 3 W, PA see their last 32°F night by April 29; only one in ten is past it by April 14, and one in ten still has one after May 17. Planting tender crops after May 5 leaves a 30% risk of a frost on them, after May 10 20%, and after May 17 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 20 in half of years, as early as October 5 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 1; in spring the one-in-ten date for 28°F is May 4, 13 days before the 32°F one. The freeze-free season lasts 171 days in a typical year, shorter than at 57% of the 176 Pennsylvania stations; it reaches 193 days one year in ten and falls short of 151 one year in ten. On average 140 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 10, and return around October 7. Severe cold of 16°F or below comes every winter, usually between December 6 and March 14.

July is the warmest month at Salina 3 W, PA, averaging 83°F by day and 61°F at night; January is the coldest at 36°F and 20°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 44% of years.

Warmth for growing adds up to 2,929 growing degree days a year (base 50°F), fewer than at 53% of the 176 Pennsylvania stations. 34% of them (996) have built up by the end of June, and July adds the most, 677. Precipitation totals 45.8 inches a year, most in June (4.9") and least in February (2.8"); May to September bring 48% of it.

The nearest other station, Loyalhanna Lake, PA, 5 miles south of Avonmore, has a last frost 3 days later (May 2), a first frost 6 days earlier (October 14), a season 8 days shorter.

The first measurable snow (0.1 inch or more) in Avonmore usually arrives around November 30, and the last of the season around March 21. Those are the middle dates across the winters of 1991–2020 at Salina 3 W, PA, 3.6 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 39 days after the last snow.

ZIP 15618 is 4 miles from Salina 3 W, PA, which stands at 1,109 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 15613 (Apollo). The 2023 USDA Plant Hardiness Zone Map lists ZIP 15618 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.