Frost Dates for 63775 — Perryville, Missouri

Half of springs at Perryville Wtp, MO see their last 32°F night by April 19; only one in ten is past it by April 3, and one in ten still has one after May 3. Planting tender crops after April 24 leaves a 30% risk of a frost on them, after April 28 20%, and after May 3 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 80% of the 158 Missouri 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 5 one year in ten, and holds off past October 31 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 22, 11 days before the 32°F one. The freeze-free season lasts 182 days in a typical year, shorter than at 86% of the 158 Missouri stations; it reaches 203 days one year in ten and falls short of 161 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 30, and return around October 10. Severe cold of 16°F or below comes every winter, usually between December 1 and March 2.

July is the warmest month at Perryville Wtp, MO, averaging 88°F by day and 66°F at night; January is the coldest at 41°F and 21°F. A freezing night is all but certain in every month from October 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 14% of years.

Warmth for growing adds up to 3,938 growing degree days a year (base 50°F), fewer than at 61% of the 158 Missouri stations. 37% of them (1,464) have built up by the end of June, and July adds the most, 843. Precipitation totals 46.1 inches a year, most in May (5.7") and least in January (2.7"); May to September bring 44% of it.

The nearest other station, Kaskaskia Rvr Navigation Lock, IL, 19 miles north of Perryville, has a last frost 11 days earlier (April 8), a first frost 10 days later (October 30), a season 20 days longer.

The first measurable snow (0.1 inch or more) in Perryville usually arrives around January 5, and the last of the season around February 14. Those are the middle dates across the winters of 1991–2020 at Perryville Wtp, MO, 2.7 miles away: half of years saw snow earlier, half later. Snow fell in 83% of those winters. The last 32°F night of spring typically comes 64 days after the last snow.

ZIP 63775 is 3 miles from Perryville Wtp, MO, which stands at 502 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 63775 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.