Frost Dates for 53955 — Poynette, Wisconsin

Half of springs at Arlington, WI see their last 32°F night by May 4; only one in ten is past it by April 20, and one in ten still has one after May 18. Planting tender crops after May 10 leaves a 30% risk of a frost on them, after May 14 20%, and after May 18 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 58% of the 182 Wisconsin stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 6 in half of years, as early as September 23 one year in ten, and holds off past October 20 one year in ten. A hard freeze of 28°F follows 12 days later, around October 18; in spring the one-in-ten date for 28°F is May 7, 11 days before the 32°F one. The freeze-free season lasts 154 days in a typical year, shorter than at 53% of the 182 Wisconsin stations; it reaches 172 days one year in ten and falls short of 136 one year in ten. On average 164 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 10 days longer, to about May 14, and return around September 28. Severe cold of 16°F or below comes every winter, usually between November 18 and March 23.

July is the warmest month at Arlington, WI, averaging 82°F by day and 60°F at night; January is the coldest at 26°F and 9°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 62% of years.

Warmth for growing adds up to 2,561 growing degree days a year (base 50°F), more than at 66% of the 182 Wisconsin stations. 33% of them (855) have built up by the end of June, and July adds the most, 651. Precipitation totals 35.4 inches a year, most in June (5.1") and least in January (1.2"); May to September bring 58% of it.

The nearest other station, Lodi, WI, 8 miles southwest of Poynette and 228 feet lower, has a last frost 3 days earlier (May 1), a first frost 4 days later (October 10), a season 8 days longer.

The first measurable snow (0.1 inch or more) in Poynette usually arrives around November 23, and the last of the season around April 6. Those are the middle dates across the winters of 1991–2020 at Arlington, WI, 7.8 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 28 days after the last snow.

ZIP 53955 is 8 miles from Arlington, WI, which stands at 1,052 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 53532 (Deforest). The 2023 USDA Plant Hardiness Zone Map lists ZIP 53955 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.