Frost Dates for 15705 — Indiana, Pennsylvania

Half of springs at Indiana 3 SE, PA see their last 32°F night by May 8; only one in ten is past it by April 23, and one in ten still has one after May 24. Planting tender crops after May 15 leaves a 30% risk of a frost on them, after May 19 20%, and after May 24 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 51% of the 176 Pennsylvania stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 13 in half of years, as early as October 1 one year in ten, and holds off past October 27 one year in ten. A hard freeze of 28°F follows 12 days later, around October 25; in spring the one-in-ten date for 28°F is May 14, 10 days before the 32°F one. The freeze-free season lasts 157 days in a typical year, shorter than at 80% of the 176 Pennsylvania stations; it reaches 178 days one year in ten and falls short of 136 one year in ten. On average 131 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 20, and return around October 3. Severe cold of 16°F or below comes every winter, usually between November 27 and March 22.

July is the warmest month at Indiana 3 SE, PA, averaging 83°F by day and 59°F at night; January is the coldest at 36°F and 18°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 71% of years.

Warmth for growing adds up to 2,703 growing degree days a year (base 50°F), fewer than at 66% of the 176 Pennsylvania stations. 33% of them (904) have built up by the end of June, and July adds the most, 640. Precipitation totals 47.8 inches a year, most in July (5.1") and least in February (3.0"); May to September bring 47% of it.

The nearest other station, Ford City 4 S Dam, PA, 21 miles west of Indiana and 172 feet lower, has a last frost 4 days earlier (May 4), a first frost 3 days later (October 16), a season 7 days longer.

The first measurable snow (0.1 inch or more) in Indiana usually arrives around November 17, and the last of the season around April 1. Those are the middle dates across the winters of 1991–2020 at Indiana 3 SE, PA, 3 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 37 days after the last snow.

ZIP 15705 is 3 miles from Indiana 3 SE, PA, which stands at 1,102 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station; its figures are presented in full for 15701 (Indiana). The 2023 USDA Plant Hardiness Zone Map lists ZIP 15705 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.