Frost Dates for 62016 — Carrollton, Illinois

Half of springs at White Hall 1 E, IL see their last 32°F night by April 13; only one in ten is past it by March 30, and one in ten still has one after April 28. Planting tender crops after April 20 leaves a 30% risk of a frost on them, after April 23 20%, and after April 28 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 54% 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 2 one year in ten. A hard freeze of 28°F follows 10 days later, around November 1; in spring the one-in-ten date for 28°F is April 17, 11 days before the 32°F one. The freeze-free season lasts 190 days in a typical year, longer than at 66% of the 158 Illinois stations; it reaches 210 days one year in ten and falls short of 170 one year in ten. On average 120 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 12 days longer, to about April 25, and return around October 12. Severe cold of 16°F or below comes every winter, usually between December 1 and March 5.

July is the warmest month at White Hall 1 E, IL, averaging 86°F by day and 66°F at night; January is the coldest at 35°F and 18°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 86% of years.

Warmth for growing adds up to 3,639 growing degree days a year (base 50°F), more than at 61% of the 158 Illinois stations. 36% of them (1,321) have built up by the end of June, and July adds the most, 795. Precipitation totals 39.7 inches a year, most in May (4.8") and least in January (2.1"); May to September bring 50% of it.

The nearest other station, Jerseyville 2 SW, IL, 14 miles south of Carrollton, has a last frost 1 day later (April 14), a first frost 3 days earlier (October 19), a season 3 days shorter.

The first measurable snow (0.1 inch or more) in Carrollton usually arrives around December 5, and the last of the season around March 14. Those are the middle dates across the winters of 1991–2020 at White Hall 1 E, IL, 9.8 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 30 days after the last snow.

ZIP 62016 is 10 miles from White Hall 1 E, IL, which stands at 580 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 62016 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.