Frost Dates for 29487 — Wadmalaw Island, South Carolina

Half of springs at Edisto Is Middleton Plantation, SC see their last 32°F night by March 1; only one in ten is past it by February 1, and one in ten still has one after March 22. Planting tender crops after March 10 leaves a 30% risk of a frost on them, after March 15 20%, and after March 22 10%. The 21 days between the even-odds date and the one-in-ten date is wider than at 95% of the 105 South Carolina stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.

In fall the first 32°F night comes by December 6 in half of years, as early as November 15 one year in ten, and holds off past January 4 one year in ten. A hard freeze of 28°F follows 23 days later, around December 29; in spring the one-in-ten date for 28°F is March 9, 13 days before the 32°F one. The freeze-free season lasts 284 days in a typical year, longer than at 99% of the 105 South Carolina stations; it reaches 318 days one year in ten and falls short of 253 one year in ten. On average 16 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 12 days longer, to about March 13, and return around November 21. Nights of 24°F, cold enough to damage hardier plants, come in 68% of winters and 16°F in 5%.

July is the warmest month at Edisto Is Middleton Plantation, SC, averaging 90°F by day and 74°F at night; January is the coldest at 59°F and 40°F. A freezing night is all but certain in January (a 90% chance or more). From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 82% of years and March still brings one in 50% of years.

Warmth for growing adds up to 6,408 growing degree days a year (base 50°F), more than at 93% of the 105 South Carolina stations. 41% of them (2,628) have built up by the end of June, and July adds the most, 1,000. Precipitation totals 52.1 inches a year, most in August (7.5") and least in November (2.6"); May to September bring 52% of it.

The nearest other station, Edisto Beach Sp, SC, 12 miles southwest of Wadmalaw Island, has the same 50% last-frost date, the same first-frost date, a season 4 days shorter.

Measurable snow is rare here: only 0 of 15 winters from 1991 to 2020 recorded 0.1 inch or more at Edisto Beach Sp, SC, 12.2 miles away, so there is no typical first-snow date to plan around.

ZIP 29487 is 9 miles from Edisto Is Middleton Plantation, SC, which stands at 12 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 29449 (Hollywood). The 2023 USDA Plant Hardiness Zone Map lists ZIP 29487 in zone 9a, the band where the coldest night of the year averaged 20 to 25°F (-6.7 to -3.9°C) over 1991–2020; a zone describes winter lows, not frost dates.