Frost Dates for 60010 — Barrington, Illinois

Half of springs at Barrington 3SW, IL see their last 32°F night by April 25; only one in ten is past it by April 10, and one in ten still has one after May 12. Planting tender crops after May 1 leaves a 30% risk of a frost on them, after May 5 20%, and after May 12 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 79% 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 11 days later, around October 30; in spring the one-in-ten date for 28°F is April 30, 12 days before the 32°F one. The freeze-free season lasts 177 days in a typical year, shorter than at 72% of the 158 Illinois stations; it reaches 196 days one year in ten and falls short of 152 one year in ten. On average 137 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 May 6, and return around October 11. Severe cold of 16°F or below comes every winter, usually between November 29 and March 14.

July is the warmest month at Barrington 3SW, IL, averaging 81°F by day and 63°F at night; January is the coldest at 29°F and 13°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 31% of years.

Warmth for growing adds up to 2,764 growing degree days a year (base 50°F), fewer than at 95% of the 158 Illinois stations. 33% of them (921) have built up by the end of June, and July adds the most, 680. Precipitation totals 40.7 inches a year, most in May (5.2") and least in February (1.9"); May to September bring 54% of it.

The nearest other station, Mundelein 4 WSW, IL, 8 miles northeast of Barrington, has a last frost 4 days later (April 29), a first frost 1 day later (October 20), a season 5 days shorter.

The first measurable snow (0.1 inch or more) in Barrington usually arrives around November 23, and the last of the season around April 2. Those are the middle dates across the winters of 1991–2020 at Barrington 3SW, IL, 3.2 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 23 days after the last snow.

ZIP 60010 is 3 miles from Barrington 3SW, IL, which stands at 875 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 60010 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.