Frost Dates for 63459 — New London, Missouri

Half of springs at Saverton L&D 22, MO see their last 32°F night by April 4; only one in ten is past it by March 20, and one in ten still has one after April 19. Planting tender crops after April 9 leaves a 30% risk of a frost on them, after April 13 20%, and after April 19 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 November 4 in half of years, as early as October 23 one year in ten, and holds off past November 18 one year in ten. A hard freeze of 28°F follows 10 days later, around November 14; in spring the one-in-ten date for 28°F is April 8, 11 days before the 32°F one. The freeze-free season lasts 212 days in a typical year, longer than at 92% of the 158 Missouri stations; it reaches 234 days one year in ten and falls short of 194 one year in ten. On average 105 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 April 14, and return around October 24. Severe cold of 16°F or below comes every winter, usually between December 11 and March 1.

July is the warmest month at Saverton L&D 22, MO, averaging 89°F by day and 69°F at night; January is the coldest at 37°F and 21°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 66% of years.

Warmth for growing adds up to 4,121 growing degree days a year (base 50°F), more than at 60% of the 158 Missouri stations. 36% of them (1,473) have built up by the end of June, and July adds the most, 887. Precipitation totals 38.6 inches a year, most in May (4.7") and least in January (1.9"); May to September bring 53% of it.

The nearest other station, Hannibal Wtr Wks, MO, 10 miles north of New London and 240 feet higher, has a last frost 6 days later (April 10), a first frost 8 days earlier (October 27), a season 13 days shorter.

The first measurable snow (0.1 inch or more) in New London usually arrives around December 5, and the last of the season around March 11. Those are the middle dates across the winters of 1991–2020 at Hannibal Wtr Wks, MO, 9.6 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 24 days after the last snow.

ZIP 63459 is 8 miles from Saverton L&D 22, MO, which stands at 472 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 63459 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.