Frost Dates for 64064 — Lees Summit, Missouri

Half of springs at Lees Summit Municipal Airport, MO see their last 32°F night by April 7; only one in ten is past it by March 21, and one in ten still has one after April 24. Planting tender crops after April 13 leaves a 30% risk of a frost on them, after April 18 20%, and after April 24 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 66% of the 158 Missouri stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 29 in half of years, as early as October 14 one year in ten, and holds off past November 12 one year in ten. A hard freeze of 28°F follows 9 days later, around November 7; in spring the one-in-ten date for 28°F is April 11, 13 days before the 32°F one. The freeze-free season lasts 202 days in a typical year, longer than at 73% of the 158 Missouri stations; it reaches 224 days one year in ten and falls short of 180 one year in ten. On average 96 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 19, and return around October 19. Severe cold of 16°F or below comes every winter, usually between December 8 and February 28.

July is the warmest month at Lees Summit Municipal Airport, MO, averaging 88°F by day and 70°F at night; January is the coldest at 39°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 69% of years.

Warmth for growing adds up to 4,183 growing degree days a year (base 50°F), more than at 66% of the 158 Missouri stations. 37% of them (1,541) have built up by the end of June, and July adds the most, 899. Precipitation totals 38.5 inches a year, most in May (5.7") and least in January (1.0"); May to September bring 59% of it.

The nearest other station, Independence, MO, 5 miles north of Lees Summit, has a last frost 3 days later (April 10), a first frost 2 days earlier (October 27), a season 4 days shorter.

The first measurable snow (0.1 inch or more) in Lees Summit usually arrives around December 19, and the last of the season around March 2. Those are the middle dates across the winters of 1991–2020 at Unity Village, MO, 3.3 miles away: half of years saw snow earlier, half later. Snow fell in 96% of those winters. The last 32°F night of spring typically comes 36 days after the last snow.

ZIP 64064 is 2 miles from Lees Summit Municipal Airport, MO, which stands at 997 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 10 other ZIP codes share the station; its figures are presented in full for 64015 (Blue Springs). The 2023 USDA Plant Hardiness Zone Map lists ZIP 64064 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.