Frost Dates for 54771 — Thorp, Wisconsin

Half of springs at Stanley Wwtp, WI see their last 32°F night by May 7; only one in ten is past it by April 24, and one in ten still has one after May 21. Planting tender crops after May 13 leaves a 30% risk of a frost on them, after May 16 20%, and after May 21 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 3 in half of years, as early as September 20 one year in ten, and holds off past October 16 one year in ten. A hard freeze of 28°F follows 11 days later, around October 14; in spring the one-in-ten date for 28°F is May 10, 11 days before the 32°F one. The freeze-free season lasts 147 days in a typical year, shorter than at 71% of the 182 Wisconsin stations; it reaches 168 days one year in ten and falls short of 127 one year in ten. On average 175 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 11 days longer, to about May 18, and return around September 25. Severe cold of 16°F or below comes every winter, usually between November 15 and March 31.

July is the warmest month at Stanley Wwtp, WI, averaging 80°F by day and 59°F at night; January is the coldest at 22°F and 3°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 74% of years.

Warmth for growing adds up to 2,274 growing degree days a year (base 50°F), fewer than at 68% of the 182 Wisconsin stations. 33% of them (746) have built up by the end of June, and July adds the most, 606. Precipitation totals 32.5 inches a year, most in June (4.3") and least in January (0.9"); May to September bring 61% of it.

The nearest other station, Owen 1E, WI, 12 miles east of Thorp and 158 feet higher, has a last frost 6 days later (May 13), a first frost 7 days earlier (September 26), a season 11 days shorter.

The first measurable snow (0.1 inch or more) in Thorp usually arrives around November 10, and the last of the season around April 13. Those are the middle dates across the winters of 1991–2020 at Stanley Wwtp, WI, 6.3 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 24 days after the last snow.

ZIP 54771 is 6 miles from Stanley Wwtp, WI, which stands at 1,080 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 54768 (Stanley). The 2023 USDA Plant Hardiness Zone Map lists ZIP 54771 in zone 4b, the band where the coldest night of the year averaged -25 to -20°F (-31.7 to -28.9°C) over 1991–2020; a zone describes winter lows, not frost dates.