Frost Dates for 62441 — Marshall, Illinois

Half of springs at Paris Stp, IL see their last 32°F night by April 21; only one in ten is past it by April 6, and one in ten still has one after May 9. Planting tender crops after April 27 leaves a 30% risk of a frost on them, after May 1 20%, and after May 9 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 92% of the 158 Illinois 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 1 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 10 days later, around October 30; in spring the one-in-ten date for 28°F is April 26, 13 days before the 32°F one. The freeze-free season lasts 179 days in a typical year, shorter than at 65% of the 158 Illinois stations; it reaches 199 days one year in ten and falls short of 158 one year in ten. On average 116 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 1, and return around October 8. Severe cold of 16°F or below comes every winter, usually between November 29 and March 11.

July is the warmest month at Paris Stp, IL, averaging 84°F by day and 64°F at night; January is the coldest at 34°F and 17°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 21% of years.

Warmth for growing adds up to 3,354 growing degree days a year (base 50°F), fewer than at 59% of the 158 Illinois stations. 36% of them (1,206) have built up by the end of June, and July adds the most, 747. Precipitation totals 42.7 inches a year, most in June (5.0") and least in February (2.3"); May to September bring 46% of it.

The nearest other station, Terre Haute Indiana State, IN, 16 miles east of Marshall, has a last frost 6 days earlier (April 15), a first frost 1 day earlier (October 19), a season 8 days longer.

The first measurable snow (0.1 inch or more) in Marshall usually arrives around December 4, and the last of the season around March 8. Those are the middle dates across the winters of 1991–2020 at Paris Stp, IL, 15.4 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 44 days after the last snow.

ZIP 62441 is 15 miles from Paris Stp, IL, which stands at 649 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 61944 (Paris). The 2023 USDA Plant Hardiness Zone Map lists ZIP 62441 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.