Frost Dates for 48044 — Macomb, Michigan

Half of springs at Mt Clemens Ang Base, MI see their last 32°F night by April 30; only one in ten is past it by April 16, and one in ten still has one after May 15. Planting tender crops after May 5 leaves a 30% risk of a frost on them, after May 9 20%, and after May 15 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 24 in half of years, as early as October 7 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 10 days later, around November 3; 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 174 days in a typical year, longer than at 85% of the 172 Michigan stations; it reaches 192 days one year in ten and falls short of 153 one year in ten. On average 129 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 11 days longer, to about May 11, and return around October 9. Severe cold of 16°F or below comes every winter, usually between December 6 and March 17.

July is the warmest month at Mt Clemens Ang Base, MI, averaging 82°F by day and 62°F at night; January is the coldest at 32°F and 18°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 45% of years.

Warmth for growing adds up to 2,703 growing degree days a year (base 50°F), more than at 73% of the 172 Michigan stations. 31% of them (850) have built up by the end of June, and July adds the most, 684. Precipitation totals 35.1 inches a year, most in July (3.8") and least in February (1.8"); May to September bring 50% of it.

The nearest other station, Pontiac Wwtp, MI, 16 miles west of Macomb and 310 feet higher, has a last frost 4 days earlier (April 26), a first frost 2 days earlier (October 22), a season 3 days longer.

The first measurable snow (0.1 inch or more) in Macomb usually arrives around November 28, and the last of the season around April 9. Those are the middle dates across the winters of 1991–2020 at Mt Clemens Ang Base, MI, 6.6 miles away: half of years saw snow earlier, half later. Snow fell in 95% of those winters. The last 32°F night of spring typically comes 21 days after the last snow.

ZIP 48044 is 7 miles from Mt Clemens Ang Base, MI, which stands at 580 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 14 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 48044 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.