Frost Dates for 62454 — Robinson, Illinois

Half of springs at Robinson, IL see their last 32°F night by April 13; only one in ten is past it by April 2, and one in ten still has one after April 28. Planting tender crops after April 18 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 7 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 9 days later, around October 31; 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 208 days one year in ten and falls short of 168 one year in ten. On average 114 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 24, and return around October 12. Severe cold of 16°F or below comes every winter, usually between December 4 and March 4.

July is the warmest month at Robinson, IL, averaging 87°F by day and 66°F at night; January is the coldest at 37°F and 20°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month.

Warmth for growing adds up to 3,872 growing degree days a year (base 50°F), more than at 77% of the 158 Illinois stations. 38% of them (1,457) have built up by the end of June, and July adds the most, 823. Precipitation totals 45.7 inches a year, most in April (5.2") and least in February (2.4"); May to September bring 45% of it.

The nearest other station, Lawrenceville 2WSW, IL, 19 miles south of Robinson, has a last frost 1 day earlier (April 12), a first frost 3 days later (October 25), a season 3 days longer.

The first measurable snow (0.1 inch or more) in Robinson usually arrives around December 10, and the last of the season around February 24. Those are the middle dates across the winters of 1991–2020 at Palestine, IL, 6.8 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 48 days after the last snow.

ZIP 62454 is 2 miles from Robinson, IL, which stands at 535 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 62454 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.