Frost Dates for 37324 — Decherd, Tennessee

Half of springs at Winchester 5SE, TN see their last 32°F night by April 6; only one in ten is past it by March 19, and one in ten still has one after April 25. Planting tender crops after April 14 leaves a 30% risk of a frost on them, after April 18 20%, and after April 25 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 84% of the 144 Tennessee 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 16 one year in ten, and holds off past November 11 one year in ten. A hard freeze of 28°F follows 8 days later, around November 6; in spring the one-in-ten date for 28°F is April 10, 15 days before the 32°F one. The freeze-free season lasts 204 days in a typical year, shorter than at 47% of the 144 Tennessee stations; it reaches 226 days one year in ten and falls short of 182 one year in ten. On average 71 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 15 days longer, to about April 21, and return around October 21. Severe cold of 16°F or below comes in 96% of winters, usually between December 24 and February 10.

July is the warmest month at Winchester 5SE, TN, averaging 87°F by day and 68°F at night; January is the coldest at 49°F and 30°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 68% of years.

Warmth for growing adds up to 4,548 growing degree days a year (base 50°F), more than at 60% of the 144 Tennessee stations. 39% of them (1,754) have built up by the end of June, and July adds the most, 856. Precipitation totals 57.9 inches a year, most in March (5.8") and least in October (3.4"); May to September bring 40% of it.

The nearest other station, Sewanee, TN, 7 miles east of Decherd and 987 feet higher, has a last frost 4 days earlier (April 2), a first frost 6 days later (November 4), a season 12 days longer.

The first measurable snow (0.1 inch or more) in Decherd usually arrives around January 12, and the last of the season around February 14. Those are the middle dates across the winters of 1991–2020 at Winchester 5SE, TN, 5 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 51 days after the last snow.

ZIP 37324 is 5 miles from Winchester 5SE, TN, which stands at 941 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 37398 (Winchester). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37324 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.