Frost Dates for 71638 — Dermott, Arkansas

Half of springs at Dermott 3 NE, AR see their last 32°F night by March 13; only one in ten is past it by February 23, and one in ten still has one after March 31. Planting tender crops after March 20 leaves a 30% risk of a frost on them, after March 25 20%, and after March 31 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 60% of the 105 Arkansas stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 10 in half of years, as early as October 25 one year in ten, and holds off past November 30 one year in ten. A hard freeze of 28°F follows 13 days later, around November 23; in spring the one-in-ten date for 28°F is March 18, 13 days before the 32°F one. The freeze-free season lasts 242 days in a typical year, longer than at 89% of the 105 Arkansas stations; it reaches 269 days one year in ten and falls short of 215 one year in ten. On average 47 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 13 days longer, to about March 26, and return around October 31. Nights of 24°F, cold enough to damage hardier plants, come in 98% of winters and 16°F in 41%.

July is the warmest month at Dermott 3 NE, AR, averaging 91°F by day and 72°F at night; January is the coldest at 51°F and 34°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From April to September the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 77% of years.

Warmth for growing adds up to 5,601 growing degree days a year (base 50°F), more than at 86% of the 105 Arkansas stations. 40% of them (2,257) have built up by the end of June, and July adds the most, 973. Precipitation totals 56.4 inches a year, most in April (6.1") and least in August (3.0"); May to September bring 34% of it.

The nearest other station, Monticello Municipal Airport, AR, 18 miles northwest of Dermott, has a last frost 5 days later (March 18), a first frost 2 days later (November 12), a season 4 days shorter.

Measurable snow is rare here: only 11 of 28 winters from 1991 to 2020 recorded 0.1 inch or more at Dermott 3 NE, AR, 5.9 miles away, so there is no typical first-snow date to plan around.

ZIP 71638 is 6 miles from Dermott 3 NE, AR, which stands at 145 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 71654 (Mc Gehee). The 2023 USDA Plant Hardiness Zone Map lists ZIP 71638 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.