Frost Dates for 39482 — Sumrall, Mississippi

Half of springs at Hattiesburg 5SW, MS see their last 32°F night by March 7; only one in ten is past it by February 14, and one in ten still has one after March 26. Planting tender crops after March 15 leaves a 30% risk of a frost on them, after March 20 20%, and after March 26 10%. The 19 days between the even-odds date and the one-in-ten date is narrower than at 38% of the 96 Mississippi stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 23 in half of years, as early as November 5 one year in ten, and holds off past December 14 one year in ten. A hard freeze of 28°F follows 11 days later, around December 4; in spring the one-in-ten date for 28°F is March 16, 10 days before the 32°F one. The freeze-free season lasts 261 days in a typical year, longer than at 89% of the 96 Mississippi stations; it reaches 290 days one year in ten and falls short of 234 one year in ten. On average 32 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 16 days longer, to about March 23, and return around November 11. Nights of 24°F, cold enough to damage hardier plants, come in 89% of winters and 16°F in 28%.

July is the warmest month at Hattiesburg 5SW, MS, averaging 91°F by day and 72°F at night; January is the coldest at 60°F and 38°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From April to October the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 63% of years.

Warmth for growing adds up to 6,381 growing degree days a year (base 50°F), more than at 85% of the 96 Mississippi stations. 42% of them (2,661) have built up by the end of June, and July adds the most, 977. Precipitation totals 64.5 inches a year, most in January (6.5") and least in October (3.5"); May to September bring 42% of it.

The nearest other station, Columbia, MS, 17 miles southwest of Sumrall and 235 feet lower, has a last frost 2 days earlier (March 5), a first frost 4 days earlier (November 19), a season 1 day longer.

Measurable snow is rare here: only 7 of 28 winters from 1991 to 2020 recorded 0.1 inch or more at Sumrall, MS, 4.2 miles away, so there is no typical first-snow date to plan around.

ZIP 39482 is 17 miles from Hattiesburg 5SW, MS, which stands at 385 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 39402 (Hattiesburg). The 2023 USDA Plant Hardiness Zone Map lists ZIP 39482 in zone 8b, the band where the coldest night of the year averaged 15 to 20°F (-9.4 to -6.7°C) over 1991–2020; a zone describes winter lows, not frost dates.