Frost Dates for 61732 — Danvers, Illinois

Half of springs at Bloomington 5W, IL see their last 32°F night by April 21; only one in ten is past it by April 7, and one in ten still has one after May 5. Planting tender crops after April 26 leaves a 30% risk of a frost on them, after April 30 20%, and after May 5 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 82% 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 9 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 23, 12 days before the 32°F one. The freeze-free season lasts 181 days in a typical year, shorter than at 57% of the 158 Illinois stations; it reaches 198 days one year in ten and falls short of 161 one year in ten. On average 132 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 11. Severe cold of 16°F or below comes every winter, usually between November 27 and March 9.

July is the warmest month at Bloomington 5W, IL, averaging 84°F by day and 63°F at night; January is the coldest at 31°F and 16°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 18% of years.

Warmth for growing adds up to 3,204 growing degree days a year (base 50°F), fewer than at 71% of the 158 Illinois stations. 36% of them (1,143) have built up by the end of June, and July adds the most, 737. Precipitation totals 40.6 inches a year, most in May (4.8") and least in February (2.1"); May to September bring 51% of it.

The nearest other station, Congerville 2NW, IL, 7 miles northwest of Danvers and 212 feet lower, has the same 50% last-frost date, a first frost 3 days earlier (October 17), a season 3 days shorter.

The first measurable snow (0.1 inch or more) in Danvers usually arrives around December 1, and the last of the season around March 17. Those are the middle dates across the winters of 1991–2020 at Congerville 2NW, IL, 6.9 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 35 days after the last snow.

ZIP 61732 is 6 miles from Bloomington 5W, IL, which stands at 852 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 61701 (Bloomington). The 2023 USDA Plant Hardiness Zone Map lists ZIP 61732 in zone 5b, the band where the coldest night of the year averaged -15 to -10°F (-26.1 to -23.3°C) over 1991–2020; a zone describes winter lows, not frost dates.