Frost Dates for 65360 — Windsor, Missouri

Half of springs at Windsor, MO see their last 32°F night by April 7; only one in ten is past it by March 23, and one in ten still has one after April 24. Planting tender crops after April 14 leaves a 30% risk of a frost on them, after April 19 20%, and after April 24 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 66% of the 158 Missouri stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 28 in half of years, as early as October 15 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 9 days later, around November 6; in spring the one-in-ten date for 28°F is April 13, 11 days before the 32°F one. The freeze-free season lasts 202 days in a typical year, longer than at 73% of the 158 Missouri stations; it reaches 222 days one year in ten and falls short of 181 one year in ten. On average 111 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 19, and return around October 18. Severe cold of 16°F or below comes every winter, usually between December 6 and March 3.

July is the warmest month at Windsor, MO, averaging 89°F by day and 69°F at night; January is the coldest at 40°F and 21°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 74% of years.

Warmth for growing adds up to 4,180 growing degree days a year (base 50°F), more than at 66% of the 158 Missouri stations. 36% of them (1,508) have built up by the end of June, and July adds the most, 893.

The nearest other station, Cole Camp 3NW, MO, 14 miles east of Windsor and 160 feet higher, has a last frost 6 days later (April 13), a first frost 5 days earlier (October 23), a season 11 days shorter.

The first measurable snow (0.1 inch or more) in Windsor 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 Windsor, MO, 0.6 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 42 days after the last snow.

ZIP 65360 is under a mile from Windsor, MO, which stands at 840 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 65360 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.