Frost Dates for 37310 — Charleston, Tennessee

Half of springs at Cleveland Fltr Plt, TN see their last 32°F night by April 6; only one in ten is past it by March 20, and one in ten still has one after April 21. Planting tender crops after April 12 leaves a 30% risk of a frost on them, after April 16 20%, and after April 21 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 78% of the 144 Tennessee stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 30 in half of years, as early as October 18 one year in ten, and holds off past November 11 one year in ten. A hard freeze of 28°F follows 9 days later, around November 8; in spring the one-in-ten date for 28°F is April 10, 11 days before the 32°F one. The freeze-free season lasts 206 days in a typical year, longer than at 54% of the 144 Tennessee stations; it reaches 228 days one year in ten and falls short of 186 one year in ten. On average 80 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 19, and return around October 22. Severe cold of 16°F or below comes in 96% of winters, usually between December 30 and February 6.

July is the warmest month at Cleveland Fltr Plt, TN, averaging 89°F by day and 68°F at night; January is the coldest at 50°F and 29°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 4,636 growing degree days a year (base 50°F), more than at 68% of the 144 Tennessee stations. 39% of them (1,793) have built up by the end of June, and July adds the most, 880. Precipitation totals 57.7 inches a year, most in March (5.6") and least in October (3.5"); May to September bring 40% of it.

The nearest other station, Athens, TN, 15 miles northeast of Charleston, has the same 50% last-frost date, a first frost 1 day later (October 31), a season 2 days longer.

Measurable snow is rare here: only 12 of 30 winters from 1991 to 2020 recorded 0.1 inch or more at Cleveland Fltr Plt, TN, 4.1 miles away, so there is no typical first-snow date to plan around.

ZIP 37310 is 4 miles from Cleveland Fltr Plt, TN, which stands at 842 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 9 other ZIP codes share the station; its figures are presented in full for 37312 (Cleveland). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37310 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.