Frost Dates for 64628 — Brookfield, Missouri

Half of springs at Brookfield, MO see their last 32°F night by April 14; only one in ten is past it by March 31, and one in ten still has one after April 28. Planting tender crops after April 20 leaves a 30% risk of a frost on them, after April 24 20%, and after April 28 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 23 in half of years, as early as October 9 one year in ten, and holds off past November 3 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 19, 9 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 210 days one year in ten and falls short of 169 one year in ten. On average 121 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 25, and return around October 13. Severe cold of 16°F or below comes every winter, usually between December 1 and March 5.

July is the warmest month at Brookfield, MO, averaging 87°F by day and 67°F at night; January is the coldest at 36°F and 18°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 86% of years.

Warmth for growing adds up to 3,843 growing degree days a year (base 50°F), fewer than at 73% of the 158 Missouri stations. 36% of them (1,385) have built up by the end of June, and July adds the most, 848. Precipitation totals 42.2 inches a year, most in May (5.5") and least in January (1.5"); May to September bring 58% of it.

The nearest other station, Chillicothe 2S, MO, 26 miles west of Brookfield, has a last frost 1 day later (April 15), a first frost 2 days earlier (October 21), a season 5 days shorter.

The first measurable snow (0.1 inch or more) in Brookfield usually arrives around December 2, and the last of the season around March 16. Those are the middle dates across the winters of 1991–2020 at Brookfield, MO, 1.9 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 29 days after the last snow.

ZIP 64628 is 2 miles from Brookfield, MO, which stands at 767 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 64628 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.