Frost Dates for 86047 — Winslow, Arizona

Half of springs at Winslow Municipal Airport, AZ 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 14. Planting tender crops after May 3 leaves a 30% risk of a frost on them, after May 7 20%, and after May 14 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 80% of the 98 Arizona stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 18 in half of years, as early as October 5 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 9 days later, around October 27; in spring the one-in-ten date for 28°F is May 1, 13 days before the 32°F one. The freeze-free season lasts 174 days in a typical year, shorter than at 79% of the 98 Arizona stations; it reaches 193 days one year in ten and falls short of 153 one year in ten. On average 134 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 8, and return around October 9. Severe cold of 16°F or below comes every winter, usually between November 26 and February 18.

July is the warmest month at Winslow Municipal Airport, AZ, averaging 95°F by day and 64°F at night; December is the coldest at 49°F and 22°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 37% of years.

Warmth for growing adds up to 4,001 growing degree days a year (base 50°F), fewer than at 73% of the 102 Arizona stations. 35% of them (1,386) have built up by the end of June, and July adds the most, 904. Precipitation totals 6.6 inches a year, most in August (1.2") and least in June (0.1"); May to September bring 52% of it.

The nearest other station, Holbrook, AZ, 32 miles southeast of Winslow and 199 feet higher, has a last frost 5 days earlier (April 22), a first frost 6 days later (October 24), a season 10 days longer.

The first measurable snow (0.1 inch or more) in Winslow usually arrives around November 30, and the last of the season around March 28. Those are the middle dates across the winters of 1991–2020 at Holbrook, AZ, 32.2 miles away: half of years saw snow earlier, half later. Snow fell in 55% of those winters. The last 32°F night of spring typically comes 30 days after the last snow.

ZIP 86047 is 19 miles from Winslow Municipal Airport, AZ, which stands at 4,886 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 86047 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.