Frost Dates for 74048 — Nowata, Oklahoma

Half of springs at Nowata, OK see their last 32°F night by April 4; only one in ten is past it by March 20, and one in ten still has one after April 21. Planting tender crops after April 10 leaves a 30% risk of a frost on them, after April 14 20%, and after April 21 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 41% of the 114 Oklahoma stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 1 in half of years, as early as October 18 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 10; in spring the one-in-ten date for 28°F is April 9, 12 days before the 32°F one. The freeze-free season lasts 210 days in a typical year, shorter than at 50% of the 114 Oklahoma stations; it reaches 231 days one year in ten and falls short of 190 one year in ten. On average 82 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 14, and return around October 24. Severe cold of 16°F or below comes every winter, usually between December 10 and February 26.

July is the warmest month at Nowata, OK, averaging 92°F by day and 71°F at night; January is the coldest at 48°F and 26°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 60% of years.

Warmth for growing adds up to 4,997 growing degree days a year (base 50°F), fewer than at 71% of the 114 Oklahoma stations. 38% of them (1,904) have built up by the end of June, and July adds the most, 978.

The nearest other station, Bartlesville 3, OK, 22 miles west of Nowata, has a last frost 7 days later (April 11), a first frost 8 days earlier (October 24), a season 15 days shorter.

The first measurable snow (0.1 inch or more) in Nowata usually arrives around December 15, and the last of the season around January 31. Those are the middle dates across the winters of 1991–2020 at Lenapah, OK, 10.8 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 63 days after the last snow.

ZIP 74048 is under a mile from Nowata, OK, which stands at 710 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 74016 (Chelsea). The 2023 USDA Plant Hardiness Zone Map lists ZIP 74048 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.