Frost Dates for 60942 — Hoopeston, Illinois

Half of springs at Hoopeston, IL see their last 32°F night by April 22; only one in ten is past it by April 7, and one in ten still has one after May 8. Planting tender crops after April 29 leaves a 30% risk of a frost on them, after May 2 20%, and after May 8 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 19 in half of years, as early as October 5 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 12 days later, around October 31; in spring the one-in-ten date for 28°F is April 26, 12 days before the 32°F one. The freeze-free season lasts 180 days in a typical year, shorter than at 60% of the 158 Illinois stations; it reaches 199 days one year in ten and falls short of 157 one year in ten. On average 118 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 10 days longer, to about May 2, and return around October 9. Severe cold of 16°F or below comes every winter, usually between November 30 and March 11.

July is the warmest month at Hoopeston, IL, averaging 85°F by day and 65°F at night; January is the coldest at 34°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 24% of years.

Warmth for growing adds up to 3,539 growing degree days a year (base 50°F), more than at 54% of the 158 Illinois stations. 37% of them (1,298) have built up by the end of June, and July adds the most, 764. Precipitation totals 41.0 inches a year, most in June (4.9") and least in February (2.0"); May to September bring 53% of it.

The nearest other station, Boswell 4WNW, IN, 12 miles northeast of Hoopeston, has a last frost 3 days later (April 25), a first frost 6 days earlier (October 13), a season 11 days shorter.

The first measurable snow (0.1 inch or more) in Hoopeston usually arrives around December 3, and the last of the season around March 11. Those are the middle dates across the winters of 1991–2020 at Hoopeston, IL, 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 42 days after the last snow.

ZIP 60942 is under a mile from Hoopeston, IL, which stands at 710 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 60942 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.