Frost Dates for 54217 — Luxemburg, Wisconsin

Half of springs at Kewaunee, WI see their last 32°F night by May 1; only one in ten is past it by April 16, and one in ten still has one after May 17. Planting tender crops after May 6 leaves a 30% risk of a frost on them, after May 10 20%, and after May 17 10%. The 16 days between the even-odds date and the one-in-ten date is wider than at 70% of the 182 Wisconsin stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 18 in half of years, as early as October 2 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 13 days later, around October 31; in spring the one-in-ten date for 28°F is May 3, 14 days before the 32°F one. The freeze-free season lasts 168 days in a typical year, longer than at 82% of the 182 Wisconsin stations; it reaches 190 days one year in ten and falls short of 146 one year in ten. On average 145 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 12 days longer, to about May 13, and return around October 6. Severe cold of 16°F or below comes every winter, usually between November 28 and March 20.

July is the warmest month at Kewaunee, WI, averaging 76°F by day and 60°F at night; January is the coldest at 26°F and 12°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 52% of years.

Warmth for growing adds up to 2,010 growing degree days a year (base 50°F), fewer than at 86% of the 182 Wisconsin stations. 25% of them (511) have built up by the end of June, and July adds the most, 566. Precipitation totals 31.2 inches a year, most in June (3.8") and least in February (1.1"); May to September bring 55% of it.

The nearest other station, Denmark Wwtp, WI, 15 miles south of Luxemburg and 218 feet higher, has a last frost 5 days later (May 6), a first frost 6 days earlier (October 12), a season 10 days shorter.

The first measurable snow (0.1 inch or more) in Luxemburg usually arrives around December 1, and the last of the season around April 6. Those are the middle dates across the winters of 1991–2020 at Kewaunee, WI, 12.2 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 25 days after the last snow.

ZIP 54217 is 12 miles from Kewaunee, WI, which stands at 593 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 54217 in zone 5b, the band where the coldest night of the year averaged -15 to -10°F (-26.1 to -23.3°C) over 1991–2020; a zone describes winter lows, not frost dates.