Frost Dates for 65582 — Vienna, Missouri

Half of springs at Vienna 2 WNW, MO see their last 32°F night by April 8; only one in ten is past it by March 21, and one in ten still has one after April 27. Planting tender crops after April 15 leaves a 30% risk of a frost on them, after April 21 20%, and after April 27 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 26 in half of years, as early as October 12 one year in ten, and holds off past November 8 one year in ten. A hard freeze of 28°F follows 10 days later, around November 5; in spring the one-in-ten date for 28°F is April 13, 14 days before the 32°F one. The freeze-free season lasts 200 days in a typical year, longer than at 70% of the 158 Missouri stations; it reaches 220 days one year in ten and falls short of 176 one year in ten. On average 115 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 21, and return around October 16. Severe cold of 16°F or below comes every winter, usually between December 10 and February 26.

July is the warmest month at Vienna 2 WNW, MO, averaging 91°F by day and 69°F at night; January is the coldest at 44°F and 24°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 67% of years.

Warmth for growing adds up to 4,507 growing degree days a year (base 50°F), more than at 91% of the 158 Missouri stations. 38% of them (1,706) have built up by the end of June, and July adds the most, 919. Precipitation totals 45.0 inches a year, most in June (5.2") and least in February (2.2"); May to September bring 50% of it.

The nearest other station, Vichy Rolla National Airport, MO, 10 miles east of Vienna and 357 feet higher, has a last frost 4 days later (April 12), a first frost 1 day earlier (October 25), a season 6 days shorter.

The first measurable snow (0.1 inch or more) in Vienna usually arrives around December 8, and the last of the season around February 24. Those are the middle dates across the winters of 1991–2020 at Vienna 2 WNW, MO, 2.6 miles away: half of years saw snow earlier, half later. Snow fell in 95% of those winters. The last 32°F night of spring typically comes 43 days after the last snow.

ZIP 65582 is 3 miles from Vienna 2 WNW, 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 65582 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.