Frost Dates for 73055 — Marlow, Oklahoma

Half of springs at Duncan, OK see their last 32°F night by March 25; only one in ten is past it by March 3, and one in ten still has one after April 12. Planting tender crops after April 2 leaves a 30% risk of a frost on them, after April 6 20%, and after April 12 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 November 7 in half of years, as early as October 22 one year in ten, and holds off past November 23 one year in ten. A hard freeze of 28°F follows 9 days later, around November 16; in spring the one-in-ten date for 28°F is March 31, 12 days before the 32°F one. The freeze-free season lasts 225 days in a typical year, longer than at 89% of the 114 Oklahoma stations; it reaches 251 days one year in ten and falls short of 200 one year in ten. On average 69 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 13 days longer, to about April 7, and return around October 30. Severe cold of 16°F or below comes in 93% of winters, usually between December 27 and February 7.

July is the warmest month at Duncan, OK, averaging 94°F by day and 72°F at night; January is the coldest at 52°F and 28°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 33% of years.

Warmth for growing adds up to 5,375 growing degree days a year (base 50°F), more than at 82% of the 114 Oklahoma stations. 38% of them (2,055) have built up by the end of June, and July adds the most, 1,009. Precipitation totals 37.2 inches a year, most in May (5.6") and least in January (1.5"); May to September bring 52% of it.

The nearest other station, Velma 7NW Mesonet, OK, 12 miles southeast of Marlow, has a last frost 3 days later (March 28), the same first-frost date, a season 2 days longer.

The first measurable snow (0.1 inch or more) in Marlow usually arrives around December 24, and the last of the season around February 11. Those are the middle dates across the winters of 1991–2020 at Marlow 1 WSW, OK, 2.6 miles away: half of years saw snow earlier, half later. Snow fell in 93% of those winters. The last 32°F night of spring typically comes 42 days after the last snow.

ZIP 73055 is 10 miles from Duncan, OK, which stands at 1,125 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 73533 (Duncan). The 2023 USDA Plant Hardiness Zone Map lists ZIP 73055 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.