Frost Dates for 49916 — Chassell, Michigan

Half of springs at Jacobsville, MI see their last 32°F night by June 1; only one in ten is past it by May 14, and one in ten still has one after June 17. Planting tender crops after June 6 leaves a 30% risk of a frost on them, after June 11 20%, and after June 17 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 38% of the 172 Michigan stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 23 in half of years, as early as September 9 one year in ten, and holds off past October 7 one year in ten. A hard freeze of 28°F follows 14 days later, around October 7; in spring the one-in-ten date for 28°F is June 4, 13 days before the 32°F one. The freeze-free season lasts 115 days in a typical year, shorter than at 96% of the 172 Michigan stations; it reaches 134 days one year in ten and falls short of 94 one year in ten. On average 194 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 13 days longer, to about June 14, and return around September 11. Severe cold of 16°F or below comes every winter, usually between November 17 and April 8.

July is the warmest month at Jacobsville, MI, averaging 77°F by day and 51°F at night; January is the coldest at 24°F and 9°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 51% of years.

Warmth for growing adds up to 1,387 growing degree days a year (base 50°F), the fewest of the 172 Michigan stations. 23% of them (322) have built up by the end of June, and July adds the most, 427. Precipitation totals 31.8 inches a year, most in September (3.5") and least in February (1.4"); May to September bring 51% of it.

The nearest other station, Hancock Houghton Co Airport, MI, 11 miles north of Chassell and 413 feet higher, has a last frost 15 days earlier (May 17), a first frost 8 days later (October 1), a season 23 days longer.

The first measurable snow (0.1 inch or more) in Chassell usually arrives around October 14, and the last of the season around May 3. Those are the middle dates across the winters of 1991–2020 at Herman, MI, 25.1 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 29 days after the last snow.

ZIP 49916 is 5 miles from Jacobsville, MI, which stands at 650 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 49916 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.