Frost Dates for 39479 — Seminary, Mississippi

Half of springs at Collins, MS see their last 32°F night by March 17; only one in ten is past it by February 28, and one in ten still has one after April 4. Planting tender crops after March 25 leaves a 30% risk of a frost on them, after March 30 20%, and after April 4 10%. The 18 days between the even-odds date and the one-in-ten date is narrower than at 53% of the 96 Mississippi stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 12 in half of years, as early as October 30 one year in ten, and holds off past December 1 one year in ten. A hard freeze of 28°F follows 14 days later, around November 26; in spring the one-in-ten date for 28°F is March 22, 13 days before the 32°F one. The freeze-free season lasts 238 days in a typical year, shorter than at 53% of the 96 Mississippi stations; it reaches 263 days one year in ten and falls short of 215 one year in ten. On average 41 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 1, and return around November 2. Nights of 24°F, cold enough to damage hardier plants, come in 99% of winters and 16°F in 55%.

July is the warmest month at Collins, MS, averaging 94°F by day and 70°F at night; January is the coldest at 62°F and 34°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 87% of years and April still brings one in 17% of years.

Warmth for growing adds up to 6,289 growing degree days a year (base 50°F), more than at 79% of the 96 Mississippi stations. 42% of them (2,613) have built up by the end of June, and July adds the most, 1,000. Precipitation totals 58.0 inches a year, most in January (5.9") and least in October (3.8"); May to September bring 39% of it.

The nearest other station, Hattiesburg 5SW, MS, 21 miles south of Seminary, has a last frost 10 days earlier (March 7), a first frost 11 days later (November 23), a season 23 days longer.

Measurable snow is rare here: only 5 of 25 winters from 1991 to 2020 recorded 0.1 inch or more at Collins, MS, 8.7 miles away, so there is no typical first-snow date to plan around.

ZIP 39479 is 9 miles from Collins, MS, which stands at 290 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 5 other ZIP codes share the station; its figures are presented in full for 39428 (Collins). The 2023 USDA Plant Hardiness Zone Map lists ZIP 39479 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.