Frost Dates for 48166 — Newport, Michigan

Half of springs at Newport 4SSE, MI see their last 32°F night by April 27; only one in ten is past it by April 12, and one in ten still has one after May 12. Planting tender crops after May 2 leaves a 30% risk of a frost on them, after May 7 20%, and after May 12 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 22 in half of years, as early as October 8 one year in ten, and holds off past November 4 one year in ten. A hard freeze of 28°F follows 12 days later, around November 3; in spring the one-in-ten date for 28°F is May 1, 11 days before the 32°F one. The freeze-free season lasts 177 days in a typical year, longer than at 92% of the 172 Michigan stations; it reaches 196 days one year in ten and falls short of 156 one year in ten. On average 125 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 May 7, and return around October 10. Severe cold of 16°F or below comes every winter, usually between December 6 and March 14.

July is the warmest month at Newport 4SSE, MI, averaging 83°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 36% of years.

Warmth for growing adds up to 2,827 growing degree days a year (base 50°F), more than at 84% of the 172 Michigan stations. 31% of them (881) have built up by the end of June, and July adds the most, 696. Precipitation totals 33.2 inches a year, most in May (3.6") and least in February (1.8"); May to September bring 51% of it.

The nearest other station, Monroe, MI, 8 miles southwest of Newport, has a last frost 4 days earlier (April 23), a first frost 1 day later (October 23), a season 5 days longer.

The first measurable snow (0.1 inch or more) in Newport usually arrives around December 1, and the last of the season around March 30. Those are the middle dates across the winters of 1991–2020 at Newport 4SSE, MI, 2.8 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 28 days after the last snow.

ZIP 48166 is 3 miles from Newport 4SSE, MI, which stands at 578 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 48166 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.