Frost Dates for 64840 — Diamond, Missouri

Half of springs at Diamond 2W, MO see their last 32°F night by April 18; only one in ten is past it by April 2, and one in ten still has one after May 3. Planting tender crops after April 25 leaves a 30% risk of a frost on them, after April 29 20%, and after May 3 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 22 in half of years, as early as October 7 one year in ten, and holds off past November 2 one year in ten. A hard freeze of 28°F follows 8 days later, around October 30; in spring the one-in-ten date for 28°F is April 22, 11 days before the 32°F one. The freeze-free season lasts 184 days in a typical year, shorter than at 81% of the 158 Missouri stations; it reaches 207 days one year in ten and falls short of 163 one year in ten. On average 104 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 30, and return around October 11. Severe cold of 16°F or below comes every winter, usually between December 3 and March 1.

July is the warmest month at Diamond 2W, MO, averaging 90°F by day and 67°F at night; January is the coldest at 46°F and 23°F. A freezing night is all but certain in every month from November 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 13% of years.

Warmth for growing adds up to 4,262 growing degree days a year (base 50°F), more than at 77% of the 158 Missouri stations. 36% of them (1,550) have built up by the end of June, and July adds the most, 880. Precipitation totals 46.8 inches a year, most in May (6.7") and least in January (1.9"); May to September bring 51% of it.

The nearest other station, Neosho, MO, 10 miles south of Diamond, has a last frost 11 days earlier (April 7), a first frost 9 days later (October 31), a season 22 days longer.

The first measurable snow (0.1 inch or more) in Diamond usually arrives around January 14, and the last of the season around February 6. Those are the middle dates across the winters of 1991–2020 at Diamond 2W, MO, 2.1 miles away: half of years saw snow earlier, half later. Snow fell in 68% of those winters. The last 32°F night of spring typically comes 71 days after the last snow.

ZIP 64840 is 2 miles from Diamond 2W, MO, which stands at 1,070 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 64840 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.