Frost Dates for 64730 — Butler, Missouri

Half of springs at Butler 4W, MO see their last 32°F night by April 12; only one in ten is past it by March 28, 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 22 20%, and after April 28 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 35% of the 158 Missouri stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 23 in half of years, as early as October 9 one year in ten, and holds off past November 4 one year in ten. A hard freeze of 28°F follows 9 days later, around November 1; 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 192 days in a typical year, shorter than at 58% of the 158 Missouri stations; it reaches 213 days one year in ten and falls short of 173 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 11 days longer, to about April 23, and return around October 13. Severe cold of 16°F or below comes every winter, usually between December 2 and March 3.

July is the warmest month at Butler 4W, MO, averaging 90°F by day and 69°F at night; January is the coldest at 40°F and 20°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 79% of years.

Warmth for growing adds up to 4,191 growing degree days a year (base 50°F), more than at 67% of the 158 Missouri stations. 36% of them (1,513) have built up by the end of June, and July adds the most, 908. Precipitation totals 43.9 inches a year, most in May (6.3") and least in January (1.6"); May to September bring 56% of it.

The nearest other station, Mound City 1SSW, KS, 28 miles west of Butler, has a last frost 3 days later (April 15), a first frost 1 day earlier (October 22), a season 4 days shorter.

The first measurable snow (0.1 inch or more) in Butler usually arrives around December 10, and the last of the season around February 28. Those are the middle dates across the winters of 1991–2020 at Butler 4W, MO, 4.4 miles away: half of years saw snow earlier, half later. Snow fell in 82% of those winters. The last 32°F night of spring typically comes 43 days after the last snow.

ZIP 64730 is 4 miles from Butler 4W, MO, which stands at 790 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 64730 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.