Frost Dates for 62230 — Breese, Illinois

Half of springs at Carlyle Rsvr, 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 29 in half of years, as early as October 16 one year in ten, and holds off past November 12 one year in ten. A hard freeze of 28°F follows 10 days later, around November 8; in spring the one-in-ten date for 28°F is April 13, 9 days before the 32°F one. The freeze-free season lasts 204 days in a typical year, longer than at 94% of the 158 Illinois stations; it reaches 227 days one year in ten and falls short of 185 one year in ten. On average 101 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 11 days longer, to about April 17, and return around October 19. Severe cold of 16°F or below comes every winter, usually between December 12 and February 28.

July is the warmest month at Carlyle Rsvr, IL, averaging 88°F by day and 68°F at night; January is the coldest at 39°F and 22°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 72% of years.

Warmth for growing adds up to 4,186 growing degree days a year (base 50°F), more than at 91% of the 158 Illinois stations. 37% of them (1,547) have built up by the end of June, and July adds the most, 874. Precipitation totals 46.0 inches a year, most in May (5.2") and least in February (2.5"); May to September bring 47% of it.

The nearest other station, Belleville Siu Rsch, IL, 18 miles west of Breese, has a last frost 6 days later (April 12), a first frost 9 days earlier (October 20), a season 15 days shorter.

The first measurable snow (0.1 inch or more) in Breese usually arrives around December 26, and the last of the season around February 26. Those are the middle dates across the winters of 1991–2020 at Albers 1 W, IL, 7.6 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 39 days after the last snow.

ZIP 62230 is 9 miles from Carlyle Rsvr, IL, which stands at 501 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 62231 (Carlyle). The 2023 USDA Plant Hardiness Zone Map lists ZIP 62230 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.