Frost Dates for 71646 — Hamburg, Arkansas

Half of springs at Crossett 2 SSE, AR see their last 32°F night by March 18; only one in ten is past it by February 26, and one in ten still has one after April 6. Planting tender crops after March 27 leaves a 30% risk of a frost on them, after March 31 20%, and after April 6 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 80% of the 105 Arkansas stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 11 in half of years, as early as October 28 one year in ten, and holds off past December 1 one year in ten. A hard freeze of 28°F follows 15 days later, around November 26; in spring the one-in-ten date for 28°F is March 25, 12 days before the 32°F one. The freeze-free season lasts 238 days in a typical year, longer than at 80% of the 105 Arkansas stations; it reaches 265 days one year in ten and falls short of 211 one year in ten. On average 66 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 2, and return around November 1. Nights of 24°F, cold enough to damage hardier plants, come in 98% of winters and 16°F in 42%.

July is the warmest month at Crossett 2 SSE, AR, averaging 95°F by day and 72°F at night; January is the coldest at 57°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 81% of years and April still brings one in 20% of years.

Warmth for growing adds up to 6,147 growing degree days a year (base 50°F), the most of the 105 Arkansas stations. 40% of them (2,479) have built up by the end of June, and July adds the most, 1,037. Precipitation totals 56.7 inches a year, most in December (5.8") and least in August (3.6"); May to September bring 35% of it.

The nearest other station, Monticello Municipal Airport, AR, 28 miles north of Hamburg, has the same 50% last-frost date, a first frost 1 day later (November 12).

Measurable snow is rare here: only 8 of 28 winters from 1991 to 2020 recorded 0.1 inch or more at Crossett 2 SSE, AR, 12 miles away, so there is no typical first-snow date to plan around.

ZIP 71646 is 12 miles from Crossett 2 SSE, AR, which stands at 180 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 71635 (Crossett). The 2023 USDA Plant Hardiness Zone Map lists ZIP 71646 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.