Frost Dates for 64759 — Lamar, Missouri

Half of springs at Lamar 7N, MO see their last 32°F night by April 9; only one in ten is past it by March 26, and one in ten still has one after April 28. Planting tender crops after April 17 leaves a 30% risk of a frost on them, after April 22 20%, and after April 28 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 92% of the 158 Missouri stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 27 in half of years, as early as October 13 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 9 days later, around November 5; in spring the one-in-ten date for 28°F is April 14, 14 days before the 32°F one. The freeze-free season lasts 199 days in a typical year, longer than at 64% of the 158 Missouri stations; it reaches 221 days one year in ten and falls short of 175 one year in ten. On average 100 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 13 days longer, to about April 22, and return around October 18. Severe cold of 16°F or below comes every winter, usually between December 6 and February 26.

July is the warmest month at Lamar 7N, MO, averaging 88°F by day and 67°F at night; January is the coldest at 43°F and 22°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 75% of years.

Warmth for growing adds up to 4,084 growing degree days a year (base 50°F), more than at 54% of the 158 Missouri stations. 36% of them (1,467) have built up by the end of June, and July adds the most, 865. Precipitation totals 49.0 inches a year, most in May (7.1") and least in January (2.0"); May to September bring 54% of it.

The nearest other station, Lockwood, MO, 20 miles southeast of Lamar, has a last frost 2 days later (April 11), a first frost 2 days earlier (October 25), a season 1 day shorter.

The first measurable snow (0.1 inch or more) in Lamar usually arrives around December 15, and the last of the season around February 15. Those are the middle dates across the winters of 1991–2020 at Lamar 7N, MO, 6.3 miles away: half of years saw snow earlier, half later. Snow fell in 92% of those winters. The last 32°F night of spring typically comes 53 days after the last snow.

ZIP 64759 is 6 miles from Lamar 7N, MO, which stands at 963 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 64759 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.