Frost Dates for 39096 — Lorman, Mississippi

Half of springs at St Joseph 3 N, LA see their last 32°F night by March 13; only one in ten is past it by February 20, and one in ten still has one after April 4. Planting tender crops after March 21 leaves a 30% risk of a frost on them, after March 27 20%, and after April 4 10%. The 22 days between the even-odds date and the one-in-ten date is wider than at 85% of the 96 Mississippi 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 November 10 in half of years, as early as October 27 one year in ten, and holds off past December 1 one year in ten. A hard freeze of 28°F follows 12 days later, around November 22; in spring the one-in-ten date for 28°F is March 19, 16 days before the 32°F one. The freeze-free season lasts 242 days in a typical year, longer than at 54% of the 96 Mississippi stations; it reaches 270 days one year in ten and falls short of 216 one year in ten. On average 33 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 29, and return around November 1. Nights of 24°F, cold enough to damage hardier plants, come in 97% of winters and 16°F in 30%.

July is the warmest month at St Joseph 3 N, LA, averaging 93°F by day and 71°F at night; January is the coldest at 59°F and 36°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 73% of years and April still brings one in 14% of years.

Warmth for growing adds up to 6,196 growing degree days a year (base 50°F), more than at 71% of the 96 Mississippi stations. 41% of them (2,559) have built up by the end of June, and July adds the most, 990. Precipitation totals 58.5 inches a year, most in January (6.3") and least in September (3.6"); May to September bring 36% of it.

The nearest other station, Port Gibson 1 NE, MS, 13 miles northeast of Lorman, has a last frost 4 days later (March 17), a first frost 2 days later (November 12), a season 1 day shorter.

Measurable snow is rare here: only 2 of 27 winters from 1991 to 2020 recorded 0.1 inch or more at St Joseph 3 N, LA, 12.5 miles away, so there is no typical first-snow date to plan around.

ZIP 39096 is 13 miles from St Joseph 3 N, LA, which stands at 78 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 39096 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.