Frost Dates for 73601 — Clinton, Oklahoma

Half of springs at Clinton, OK see their last 32°F night by April 13; only one in ten is past it by March 31, and one in ten still has one after April 27. Planting tender crops after April 19 leaves a 30% risk of a frost on them, after April 22 20%, and after April 27 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 96% of the 114 Oklahoma stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 28 in half of years, as early as October 14 one year in ten, and holds off past November 9 one year in ten. A hard freeze of 28°F follows 8 days later, around November 5; in spring the one-in-ten date for 28°F is April 18, 9 days before the 32°F one. The freeze-free season lasts 197 days in a typical year, shorter than at 90% of the 114 Oklahoma stations; it reaches 217 days one year in ten and falls short of 177 one year in ten. On average 87 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 9 days longer, to about April 22, and return around October 20. Severe cold of 16°F or below comes every winter, usually between December 7 and February 24.

July is the warmest month at Clinton, OK, averaging 95°F by day and 70°F at night; January is the coldest at 51°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 88% of years.

Warmth for growing adds up to 5,115 growing degree days a year (base 50°F), fewer than at 54% of the 114 Oklahoma stations. 38% of them (1,927) have built up by the end of June, and July adds the most, 1,015. Precipitation totals 31.1 inches a year, most in August (4.2") and least in January (0.9"); May to September bring 58% of it.

The nearest other station, Bessie 4WNW Mesonet, OK, 9 miles southwest of Clinton, has a last frost 10 days earlier (April 3), a first frost 4 days later (November 1), a season 13 days longer.

The first measurable snow (0.1 inch or more) in Clinton usually arrives around December 18, and the last of the season around February 7. Those are the middle dates across the winters of 1991–2020 at Cordell, OK, 14.4 miles away: half of years saw snow earlier, half later. Snow fell in 89% of those winters. The last 32°F night of spring typically comes 65 days after the last snow.

ZIP 73601 is under a mile from Clinton, OK, which stands at 1,570 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 73601 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.