Frost Dates for 54893 — Webster, Wisconsin

Half of springs at Danbury, WI see their last 32°F night by May 11; only one in ten is past it by April 28, and one in ten still has one after May 28. Planting tender crops after May 18 leaves a 30% risk of a frost on them, after May 23 20%, and after May 28 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 90% of the 182 Wisconsin stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 30 in half of years, as early as September 15 one year in ten, and holds off past October 13 one year in ten. A hard freeze of 28°F follows 9 days later, around October 9; in spring the one-in-ten date for 28°F is May 16, 12 days before the 32°F one. The freeze-free season lasts 138 days in a typical year, shorter than at 88% of the 182 Wisconsin stations; it reaches 159 days one year in ten and falls short of 117 one year in ten. On average 174 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 May 26, and return around September 20. Severe cold of 16°F or below comes every winter, usually between November 10 and April 2.

July is the warmest month at Danbury, WI, averaging 80°F by day and 58°F at night; January is the coldest at 22°F and 2°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 80% of years.

Warmth for growing adds up to 2,170 growing degree days a year (base 50°F), fewer than at 78% of the 182 Wisconsin stations. 32% of them (686) have built up by the end of June, and July adds the most, 589. Precipitation totals 30.2 inches a year, most in July (4.2") and least in January (0.7"); May to September bring 64% of it.

The nearest other station, Grantsburg, WI, 20 miles west of Webster, has the same 50% last-frost date, a first frost 1 day later (October 1), a season 3 days longer.

The first measurable snow (0.1 inch or more) in Webster usually arrives around November 9, and the last of the season around April 11. Those are the middle dates across the winters of 1991–2020 at Danbury, WI, 10.3 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 30 days after the last snow.

ZIP 54893 is 10 miles from Danbury, WI, which stands at 950 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 54893 in zone 4a, the band where the coldest night of the year averaged -30 to -25°F (-34.4 to -31.7°C) over 1991–2020; a zone describes winter lows, not frost dates.