Frost Dates for 62274 — Pinckneyville, Illinois

Half of springs at Du Quoin 4 SE, IL see their last 32°F night by April 6; only one in ten is past it by March 23, and one in ten still has one after April 22. Planting tender crops after April 13 leaves a 30% risk of a frost on them, after April 17 20%, and after April 22 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 22% of the 158 Illinois stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 22 in half of years, as early as October 9 one year in ten, and holds off past November 5 one year in ten. A hard freeze of 28°F follows 11 days later, around November 2; in spring the one-in-ten date for 28°F is April 11, 11 days before the 32°F one. The freeze-free season lasts 199 days in a typical year, longer than at 85% of the 158 Illinois stations; it reaches 218 days one year in ten and falls short of 177 one year in ten. On average 93 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 13 days longer, to about April 19, and return around October 12. Severe cold of 16°F or below comes every winter, usually between December 9 and February 24.

July is the warmest month at Du Quoin 4 SE, IL, averaging 87°F by day and 68°F at night; January is the coldest at 40°F and 24°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 70% of years.

Warmth for growing adds up to 4,113 growing degree days a year (base 50°F), more than at 88% of the 158 Illinois stations. 38% of them (1,578) have built up by the end of June, and July adds the most, 849. Precipitation totals 47.8 inches a year, most in May (5.5") and least in February (2.9"); May to September bring 44% of it.

The nearest other station, Sparta 1 W, IL, 18 miles west of Pinckneyville, has a last frost 6 days later (April 12), the same first-frost date, a season 8 days shorter.

The first measurable snow (0.1 inch or more) in Pinckneyville usually arrives around December 20, and the last of the season around February 18. Those are the middle dates across the winters of 1991–2020 at Pinckneyville 2 N, IL, 1.4 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 47 days after the last snow.

ZIP 62274 is 12 miles from Du Quoin 4 SE, IL, which stands at 420 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 62832 (Du Quoin). The 2023 USDA Plant Hardiness Zone Map lists ZIP 62274 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.