Frost Dates for 73554 — Mangum, Oklahoma

Half of springs at Mangum, OK see their last 32°F night by April 8; only one in ten is past it by March 21, and one in ten still has one after April 24. Planting tender crops after April 15 leaves a 30% risk of a frost on them, after April 19 20%, and after April 24 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 61% of the 114 Oklahoma stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 2 in half of years, as early as October 19 one year in ten, and holds off past November 16 one year in ten. A hard freeze of 28°F follows 8 days later, around November 10; in spring the one-in-ten date for 28°F is April 13, 11 days before the 32°F one. The freeze-free season lasts 207 days in a typical year, shorter than at 68% of the 114 Oklahoma stations; it reaches 229 days one year in ten and falls short of 186 one year in ten. On average 89 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 April 18, and return around October 25. Severe cold of 16°F or below comes in 99% of winters, usually between December 12 and February 16.

July is the warmest month at Mangum, OK, averaging 95°F by day and 71°F at night; January is the coldest at 52°F and 25°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 70% of years.

Warmth for growing adds up to 5,134 growing degree days a year (base 50°F), fewer than at 51% of the 114 Oklahoma stations. 38% of them (1,934) have built up by the end of June, and July adds the most, 1,011. Precipitation totals 26.5 inches a year, most in May (4.0") and least in January (0.9"); May to September bring 59% of it.

The nearest other station, Altus Irig Rsch Stn, OK, 21 miles southeast of Mangum and 215 feet lower, has a last frost 3 days earlier (April 5), the same first-frost date, a season 3 days longer.

The first measurable snow (0.1 inch or more) in Mangum usually arrives around January 22, and the last of the season around January 31. Those are the middle dates across the winters of 1991–2020 at Mangum, OK, 2.7 miles away: half of years saw snow earlier, half later. Snow fell in 52% of those winters. The last 32°F night of spring typically comes 67 days after the last snow.

ZIP 73554 is 3 miles from Mangum, OK, which stands at 1,595 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 73554 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.