Frost Dates for 37040 — Clarksville, Tennessee

Half of springs at Clarksville Wwtp, TN see their last 32°F night by April 3; only one in ten is past it by March 19, and one in ten still has one after April 20. Planting tender crops after April 10 leaves a 30% risk of a frost on them, after April 14 20%, and after April 20 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 34% of the 144 Tennessee stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 1 in half of years, as early as October 20 one year in ten, and holds off past November 14 one year in ten. A hard freeze of 28°F follows 10 days later, around November 11; in spring the one-in-ten date for 28°F is April 8, 12 days before the 32°F one. The freeze-free season lasts 212 days in a typical year, longer than at 76% of the 144 Tennessee stations; it reaches 233 days one year in ten and falls short of 192 one year in ten. On average 78 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 16, and return around October 23. Severe cold of 16°F or below comes in 99% of winters, usually between December 24 and February 10.

July is the warmest month at Clarksville Wwtp, TN, averaging 90°F by day and 69°F at night; January is the coldest at 47°F and 28°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 59% of years.

Warmth for growing adds up to 4,716 growing degree days a year (base 50°F), more than at 78% of the 144 Tennessee stations. 39% of them (1,817) have built up by the end of June, and July adds the most, 913. Precipitation totals 53.6 inches a year, most in May (5.6") and least in September (3.4"); May to September bring 41% of it.

The nearest other station, Clarksville No.2, TN, 2 miles south of Clarksville, has a last frost 7 days later (April 10), a first frost 2 days earlier (October 30), a season 9 days shorter.

Measurable snow is rare here: only 8 of 22 winters from 1991 to 2020 recorded 0.1 inch or more at Clarksville Wwtp, TN, 1.3 miles away, so there is no typical first-snow date to plan around.

ZIP 37040 is 1 mile from Clarksville Wwtp, TN, which stands at 402 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 37040 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.