Frost Dates for 74455 — Porum, Oklahoma

Half of springs at Webbers Falls 5 WSW, OK see their last 32°F night by April 6; only one in ten is past it by March 19, and one in ten still has one after April 24. Planting tender crops after April 13 leaves a 30% risk of a frost on them, after April 18 20%, and after April 24 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 60% of the 114 Oklahoma stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 30 in half of years, as early as October 16 one year in ten, and holds off past November 14 one year in ten. A hard freeze of 28°F follows 9 days later, around November 8; in spring the one-in-ten date for 28°F is April 11, 13 days before the 32°F one. The freeze-free season lasts 206 days in a typical year, shorter than at 71% of the 114 Oklahoma stations; it reaches 229 days one year in ten and falls short of 184 one year in ten. On average 83 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 April 18, and return around October 22. Severe cold of 16°F or below comes in 99% of winters, usually between December 17 and February 12.

July is the warmest month at Webbers Falls 5 WSW, OK, averaging 96°F by day and 69°F at night; January is the coldest at 50°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 67% of years.

Warmth for growing adds up to 5,077 growing degree days a year (base 50°F), fewer than at 62% of the 114 Oklahoma stations. 37% of them (1,861) have built up by the end of June, and July adds the most, 995. Precipitation totals 47.4 inches a year, most in May (5.9") and least in February (2.3"); May to September bring 45% of it.

The nearest other station, Muskogee Davis Field, OK, 21 miles north of Porum, has a last frost 4 days earlier (April 2), a first frost 3 days later (November 2), a season 10 days longer.

The first measurable snow (0.1 inch or more) in Porum usually arrives around December 15, and the last of the season around February 1. Those are the middle dates across the winters of 1991–2020 at Webbers Falls 5 WSW, OK, 9.9 miles away: half of years saw snow earlier, half later. Snow fell in 88% of those winters. The last 32°F night of spring typically comes 64 days after the last snow.

ZIP 74455 is 10 miles from Webbers Falls 5 WSW, OK, which stands at 550 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 74435 (Gore). The 2023 USDA Plant Hardiness Zone Map lists ZIP 74455 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.