Frost Dates for 54247 — Whitelaw, Wisconsin

Half of springs at Manitowoc, WI see their last 32°F night by April 30; only one in ten is past it by April 14, and one in ten still has one after May 15. Planting tender crops after May 6 leaves a 30% risk of a frost on them, after May 10 20%, and after May 15 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 30% of the 182 Wisconsin stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 20 in half of years, as early as October 3 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 12 days later, around November 1; in spring the one-in-ten date for 28°F is May 3, 12 days before the 32°F one. The freeze-free season lasts 171 days in a typical year, longer than at 86% of the 182 Wisconsin stations; it reaches 193 days one year in ten and falls short of 150 one year in ten. On average 139 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 12, and return around October 7. Severe cold of 16°F or below comes every winter, usually between November 27 and March 20.

July is the warmest month at Manitowoc, WI, averaging 77°F by day and 60°F at night; January is the coldest at 27°F and 13°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 46% of years.

Warmth for growing adds up to 2,113 growing degree days a year (base 50°F), fewer than at 81% of the 182 Wisconsin stations. 26% of them (555) have built up by the end of June, and July adds the most, 577. Precipitation totals 31.5 inches a year, most in June (4.1") and least in February (1.2"); May to September bring 53% of it.

The nearest other station, Denmark Wwtp, WI, 11 miles north of Whitelaw and 227 feet higher, has a last frost 6 days later (May 6), a first frost 8 days earlier (October 12), a season 13 days shorter.

The first measurable snow (0.1 inch or more) in Whitelaw usually arrives around December 3, and the last of the season around March 19. Those are the middle dates across the winters of 1991–2020 at Manitowoc, WI, 9.9 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 42 days after the last snow.

ZIP 54247 is 10 miles from Manitowoc, WI, which stands at 584 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 54220 (Manitowoc). The 2023 USDA Plant Hardiness Zone Map lists ZIP 54247 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.