Frost Dates for 64735 — Clinton, Missouri

Half of springs at Clinton, MO see their last 32°F night by April 17; only one in ten is past it by March 31, and one in ten still has one after May 2. Planting tender crops after April 23 leaves a 30% risk of a frost on them, after April 28 20%, and after May 2 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 54% of the 158 Missouri stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 21 in half of years, as early as October 7 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 10 days later, around October 31; in spring the one-in-ten date for 28°F is April 22, 10 days before the 32°F one. The freeze-free season lasts 187 days in a typical year, shorter than at 73% of the 158 Missouri stations; it reaches 210 days one year in ten and falls short of 164 one year in ten. On average 117 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 28, and return around October 10. Severe cold of 16°F or below comes every winter, usually between December 1 and March 4.

July is the warmest month at Clinton, MO, averaging 90°F by day and 67°F at night; January is the coldest at 41°F and 19°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 85% of years and May still brings one in 12% of years.

Warmth for growing adds up to 4,095 growing degree days a year (base 50°F), more than at 56% of the 158 Missouri stations. 36% of them (1,492) have built up by the end of June, and July adds the most, 882. Precipitation totals 43.5 inches a year, most in May (5.7") and least in January (1.7"); May to September bring 53% of it.

The nearest other station, Windsor, MO, 17 miles northeast of Clinton, has a last frost 10 days earlier (April 7), a first frost 7 days later (October 28), a season 15 days longer.

The first measurable snow (0.1 inch or more) in Clinton usually arrives around December 16, and the last of the season around March 2. Those are the middle dates across the winters of 1991–2020 at Clinton, MO, 2.2 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 46 days after the last snow.

ZIP 64735 is 2 miles from Clinton, MO, which stands at 770 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 64735 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.