Frost Dates for 49747 — Hubbard Lake, Michigan

Half of springs at Alpena Co Regional Airport, MI see their last 32°F night by May 17; only one in ten is past it by May 1, and one in ten still has one after May 31. Planting tender crops after May 23 leaves a 30% risk of a frost on them, after May 27 20%, and after May 31 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 80% of the 172 Michigan stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 1 in half of years, as early as September 18 one year in ten, and holds off past October 16 one year in ten. A hard freeze of 28°F follows 14 days later, around October 15; in spring the one-in-ten date for 28°F is May 19, 12 days before the 32°F one. The freeze-free season lasts 136 days in a typical year, shorter than at 77% of the 172 Michigan stations; it reaches 157 days one year in ten and falls short of 115 one year in ten. On average 169 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 29, and return around September 21. Severe cold of 16°F or below comes every winter, usually between November 22 and April 1.

July is the warmest month at Alpena Co Regional Airport, MI, averaging 81°F by day and 56°F at night; January is the coldest at 28°F and 12°F. A freezing night is all but certain in every month from October to May (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month.

Warmth for growing adds up to 2,033 growing degree days a year (base 50°F), fewer than at 76% of the 172 Michigan stations. 29% of them (590) have built up by the end of June, and July adds the most, 564. Precipitation totals 29.6 inches a year, most in July (3.2") and least in February (1.5"); May to September bring 49% of it.

The nearest other station, Alpena Wwtp, MI, 18 miles northeast of Hubbard Lake, has a last frost 12 days earlier (May 5), a first frost 16 days later (October 17), a season 27 days longer.

The first measurable snow (0.1 inch or more) in Hubbard Lake usually arrives around November 8, and the last of the season around April 15. Those are the middle dates across the winters of 1991–2020 at Alpena Co Regional Airport, MI, 17 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 49747 is 17 miles from Alpena Co Regional Airport, MI, which stands at 684 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 49747 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.