Frost Dates for 54534 — Hurley, Wisconsin

Half of springs at Hurley, WI see their last 32°F night by May 24; only one in ten is past it by May 4, and one in ten still has one after June 7. Planting tender crops after May 30 leaves a 30% risk of a frost on them, after June 2 20%, and after June 7 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 September 28 in half of years, as early as September 13 one year in ten, and holds off past October 11 one year in ten. A hard freeze of 28°F follows 10 days later, around October 8; in spring the one-in-ten date for 28°F is May 28, 10 days before the 32°F one. The freeze-free season lasts 128 days in a typical year, shorter than at 95% of the 182 Wisconsin stations; it reaches 150 days one year in ten and falls short of 105 one year in ten. On average 185 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 June 3, and return around September 18. Severe cold of 16°F or below comes every winter, usually between November 10 and April 9.

July is the warmest month at Hurley, WI, averaging 77°F by day and 56°F at night; January is the coldest at 20°F and 3°F. A freezing night is all but certain in every month from October to May (a 90% chance or more). From July to August the chance of a 32°F night stays under 10% each month. In spring, June still brings one in 24% of years.

Warmth for growing adds up to 1,829 growing degree days a year (base 50°F), fewer than at 94% of the 182 Wisconsin stations. 31% of them (563) have built up by the end of June, and July adds the most, 512. Precipitation totals 37.4 inches a year, most in July (4.1") and least in February (1.7"); May to September bring 51% of it.

The nearest other station, Ironwood #2, MI, 6 miles northeast of Hurley, has a last frost 5 days earlier (May 19), the same first-frost date, a season 2 days longer.

The first measurable snow (0.1 inch or more) in Hurley usually arrives around October 30, and the last of the season around April 23. Those are the middle dates across the winters of 1991–2020 at Hurley, WI, 4.1 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 31 days after the last snow.

ZIP 54534 is 4 miles from Hurley, WI, which stands at 1,444 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 54534 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.