Frost Dates for 64469 — Maysville, Missouri

Half of springs at Amity 4 NE, MO see their last 32°F night by April 19; only one in ten is past it by April 4, and one in ten still has one after May 4. Planting tender crops after April 27 leaves a 30% risk of a frost on them, after April 30 20%, and after May 4 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 19 in half of years, as early as October 2 one year in ten, and holds off past October 30 one year in ten. A hard freeze of 28°F follows 10 days later, around October 29; in spring the one-in-ten date for 28°F is April 23, 11 days before the 32°F one. The freeze-free season lasts 180 days in a typical year, shorter than at 89% of the 158 Missouri stations; it reaches 199 days one year in ten and falls short of 160 one year in ten. On average 124 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 8. Severe cold of 16°F or below comes every winter, usually between November 26 and March 11.

July is the warmest month at Amity 4 NE, MO, averaging 87°F by day and 65°F at night; January is the coldest at 34°F and 15°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 20% of years.

Warmth for growing adds up to 3,484 growing degree days a year (base 50°F), fewer than at 95% of the 158 Missouri stations. 35% of them (1,229) have built up by the end of June, and July adds the most, 803. Precipitation totals 40.0 inches a year, most in May (5.7") and least in January (1.1"); May to September bring 60% of it.

The nearest other station, Cameron, MO, 13 miles southeast of Maysville, has a last frost 4 days earlier (April 15), a first frost 5 days later (October 24), a season 12 days longer.

The first measurable snow (0.1 inch or more) in Maysville usually arrives around December 7, and the last of the season around March 16. Those are the middle dates across the winters of 1991–2020 at Amity 4 NE, MO, 1.4 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 34 days after the last snow.

ZIP 64469 is 1 mile from Amity 4 NE, MO, which stands at 974 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 64469 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.