Frost Dates for 73068 — Noble, Oklahoma

Half of springs at Norman 3SSE, OK see their last 32°F night by April 3; only one in ten is past it by March 19, and one in ten still has one after April 18. Planting tender crops after April 9 leaves a 30% risk of a frost on them, after April 14 20%, and after April 18 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 86% of the 114 Oklahoma stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 3 in half of years, as early as October 21 one year in ten, and holds off past November 17 one year in ten. A hard freeze of 28°F follows 9 days later, around November 12; in spring the one-in-ten date for 28°F is April 7, 11 days before the 32°F one. The freeze-free season lasts 212 days in a typical year, longer than at 54% of the 114 Oklahoma stations; it reaches 234 days one year in ten and falls short of 191 one year in ten. On average 77 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 11 days longer, to about April 14, and return around October 25. Severe cold of 16°F or below comes in 99% of winters, usually between December 19 and February 17.

July is the warmest month at Norman 3SSE, OK, averaging 93°F by day and 71°F at night; January is the coldest at 50°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 59% of years.

Warmth for growing adds up to 5,109 growing degree days a year (base 50°F), fewer than at 56% of the 114 Oklahoma stations. 38% of them (1,927) have built up by the end of June, and July adds the most, 987. Precipitation totals 37.6 inches a year, most in May (5.1") and least in January (1.4"); May to September bring 56% of it.

The nearest other station, Norman 2NW Mesonet, OK, 10 miles northwest of Noble, has a last frost 3 days earlier (March 31), a first frost 2 days later (November 5), a season 7 days longer.

The first measurable snow (0.1 inch or more) in Noble usually arrives around December 23, and the last of the season around February 13. Those are the middle dates across the winters of 1991–2020 at Norman 3SSE, OK, 6.9 miles away: half of years saw snow earlier, half later. Snow fell in 96% of those winters. The last 32°F night of spring typically comes 49 days after the last snow.

ZIP 73068 is 7 miles from Norman 3SSE, OK, which stands at 1,128 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 73068 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.