Frost Dates for 63555 — Memphis, Missouri

Half of springs at Memphis, MO see their last 32°F night by April 23; only one in ten is past it by April 8, and one in ten still has one after May 6. Planting tender crops after April 29 leaves a 30% risk of a frost on them, after May 2 20%, and after May 6 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 94% of the 158 Missouri stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 17 in half of years, as early as October 2 one year in ten, and holds off past October 29 one year in ten. A hard freeze of 28°F follows 9 days later, around October 26; in spring the one-in-ten date for 28°F is April 27, 9 days before the 32°F one. The freeze-free season lasts 176 days in a typical year, shorter than at 94% of the 158 Missouri stations; it reaches 195 days one year in ten and falls short of 154 one year in ten. On average 130 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 10 days longer, to about May 3, and return around October 5. Severe cold of 16°F or below comes every winter, usually between November 24 and March 11.

July is the warmest month at Memphis, MO, averaging 86°F by day and 64°F at night; January is the coldest at 33°F and 14°F. A freezing night is all but certain in every month from October 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 25% of years.

Warmth for growing adds up to 3,317 growing degree days a year (base 50°F), fewer than at 99% of the 158 Missouri stations. 35% of them (1,154) have built up by the end of June, and July adds the most, 778. Precipitation totals 37.6 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, Bloomfield, IA, 22 miles northwest of Memphis, has a last frost 7 days earlier (April 16), a first frost 5 days later (October 22), a season 12 days longer.

The first measurable snow (0.1 inch or more) in Memphis usually arrives around December 7, and the last of the season around March 4. Those are the middle dates across the winters of 1991–2020 at Memphis, MO, 0.8 miles away: half of years saw snow earlier, half later. Snow fell in 93% of those winters. The last 32°F night of spring typically comes 50 days after the last snow.

ZIP 63555 is under a mile from Memphis, MO, which stands at 770 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 63555 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.