Frost Dates for 48759 — Sebewaing, Michigan

Half of springs at Cass City 1 SSW, MI see their last 32°F night by May 7; only one in ten is past it by April 25, and one in ten still has one after May 22. Planting tender crops after May 15 leaves a 30% risk of a frost on them, after May 19 20%, and after May 22 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 55% of the 172 Michigan stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 10 in half of years, as early as September 26 one year in ten, and holds off past October 25 one year in ten. A hard freeze of 28°F follows 14 days later, around October 24; in spring the one-in-ten date for 28°F is May 14, 8 days before the 32°F one. The freeze-free season lasts 152 days in a typical year, shorter than at 62% of the 172 Michigan stations; it reaches 173 days one year in ten and falls short of 131 one year in ten. On average 158 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 19, and return around September 30. Severe cold of 16°F or below comes every winter, usually between November 27 and March 22.

July is the warmest month at Cass City 1 SSW, MI, averaging 80°F by day and 57°F at night; January is the coldest at 29°F and 13°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 72% of years.

Warmth for growing adds up to 2,263 growing degree days a year (base 50°F), fewer than at 59% of the 172 Michigan stations. 32% of them (731) have built up by the end of June, and July adds the most, 583. Precipitation totals 33.0 inches a year, most in April (3.5") and least in February (1.8"); May to September bring 49% of it.

The nearest other station, Caro Wwtp, MI, 18 miles south of Sebewaing, has the same 50% last-frost date, a first frost 1 day earlier (October 9), a season 2 days longer.

The first measurable snow (0.1 inch or more) in Sebewaing usually arrives around December 3, and the last of the season around April 5. Those are the middle dates across the winters of 1991–2020 at Cass City 1 SSW, MI, 16.3 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 32 days after the last snow.

ZIP 48759 is 16 miles from Cass City 1 SSW, MI, which stands at 698 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 48726 (Cass City). The 2023 USDA Plant Hardiness Zone Map lists ZIP 48759 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.