Frost Dates for 39530 — Biloxi, Mississippi

Half of springs at Biloxi, MS see their last 32°F night by February 12; only one in ten is past it by January 18, and one in ten still has one after March 11. Planting tender crops after February 26 leaves a 30% risk of a frost on them, after March 3 20%, and after March 11 10%. The 27 days between the even-odds date and the one-in-ten date is the widest 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 December 14 in half of years, as early as November 16 one year in ten, and holds off past January 11 one year in ten. A hard freeze of 28°F follows 19 days later, around January 2; in spring the one-in-ten date for 28°F is February 28, 11 days before the 32°F one. The freeze-free season lasts 301 days in a typical year, the longest of the 96 Mississippi stations; it reaches 336 days one year in ten and falls short of 265 one year in ten. On average 11 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 17 days longer, to about March 1, and return around November 26. Nights of 24°F, cold enough to damage hardier plants, come in 50% of winters and 16°F in 4%.

July is the warmest month at Biloxi, MS, averaging 90°F by day and 75°F at night; January is the coldest at 60°F and 44°F. From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 61% of years and March still brings one in 24% of years.

Warmth for growing adds up to 6,974 growing degree days a year (base 50°F), the most of the 96 Mississippi stations. 42% of them (2,947) have built up by the end of June, and July adds the most, 1,008. Precipitation totals 66.8 inches a year, most in July (8.1") and least in October (3.7"); May to September bring 49% of it.

The nearest other station, Gulfport - Biloxi Airport, MS, 11 miles west of Biloxi, has a last frost 11 days later (February 23), a first frost 11 days earlier (December 3), a season 14 days shorter.

Measurable snow is rare here: only 1 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Biloxi, MS, 6.7 miles away, so there is no typical first-snow date to plan around.

ZIP 39530 is 7 miles from Biloxi, MS, which stands at 10 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 39564 (Ocean Springs). The 2023 USDA Plant Hardiness Zone Map lists ZIP 39530 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.