Frost Dates for 16433 — Saegertown, Pennsylvania

Half of springs at Port Meadville Airport, PA see their last 32°F night by April 30; only one in ten is past it by April 16, 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 23 in half of years, as early as October 6 one year in ten, and holds off past November 7 one year in ten. A hard freeze of 28°F follows 12 days later, around November 4; 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 175 days in a typical year, shorter than at 48% of the 176 Pennsylvania stations; it reaches 196 days one year in ten and falls short of 153 one year in ten. On average 125 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 11, and return around October 9. Severe cold of 16°F or below comes every winter, usually between December 7 and March 18.

July is the warmest month at Port Meadville Airport, PA, averaging 80°F by day and 61°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 48% of years.

Warmth for growing adds up to 2,614 growing degree days a year (base 50°F), fewer than at 70% of the 176 Pennsylvania stations. 33% of them (875) have built up by the end of June, and July adds the most, 634. Precipitation totals 41.4 inches a year, most in July (4.9") and least in February (2.0"); May to September bring 50% of it.

The nearest other station, Springboro 3 WNW, PA, 15 miles west of Saegertown and 395 feet lower, has a last frost 8 days later (May 8), a first frost 7 days earlier (October 16), a season 15 days shorter.

The first measurable snow (0.1 inch or more) in Saegertown usually arrives around November 9, and the last of the season around April 11. Those are the middle dates across the winters of 1991–2020 at Springboro 3 WNW, PA, 15.5 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 19 days after the last snow.

ZIP 16433 is 8 miles from Port Meadville Airport, PA, which stands at 1,400 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 16335 (Meadville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 16433 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.