Frost Dates for 70450 — Mount Hermon, Louisiana

Half of springs at Tylertown 5ESE, MS see their last 32°F night by March 15; only one in ten is past it by February 20, and one in ten still has one after April 8. Planting tender crops after March 26 leaves a 30% risk of a frost on them, after April 1 20%, and after April 8 10%. The 24 days between the even-odds date and the one-in-ten date is wider than at 63% of the 88 Louisiana 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 16 in half of years, as early as October 31 one year in ten, and holds off past December 5 one year in ten. A hard freeze of 28°F follows 15 days later, around December 1; in spring the one-in-ten date for 28°F is March 24, 15 days before the 32°F one. The freeze-free season lasts 245 days in a typical year, shorter than at 85% of the 88 Louisiana stations; it reaches 277 days one year in ten and falls short of 216 one year in ten. On average 37 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 31, and return around November 4. Nights of 24°F, cold enough to damage hardier plants, come in 97% of winters and 16°F in 41%.

August is the warmest month at Tylertown 5ESE, MS, averaging 92°F by day and 71°F at night; January is the coldest at 60°F and 37°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 72% of years and April still brings one in 21% of years.

Warmth for growing adds up to 6,237 growing degree days a year (base 50°F), fewer than at 72% of the 88 Louisiana stations. 41% of them (2,571) have built up by the end of June, and August adds the most, 970. Precipitation totals 62.6 inches a year, most in August (6.3") and least in September (4.3"); May to September bring 41% of it.

The nearest other station, Mccomb/Pike Co/John E Lewis Airport, MS, 21 miles northwest of Mount Hermon, has a last frost 4 days earlier (March 11), a first frost 2 days later (November 18), a season 8 days longer.

Measurable snow is rare here: only 1 of 15 winters from 1991 to 2020 recorded 0.1 inch or more at Mt Hermon 2W, LA, 2.6 miles away, so there is no typical first-snow date to plan around.

ZIP 70450 is 15 miles from Tylertown 5ESE, MS, which stands at 382 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 39667 (Tylertown). The 2023 USDA Plant Hardiness Zone Map lists ZIP 70450 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.