Frost Dates for 66092 — Wellsville, Kansas

Half of springs at Ottawa, KS see their last 32°F night by April 18; only one in ten is past it by April 5, and one in ten still has one after May 1. Planting tender crops after April 24 leaves a 30% risk of a frost on them, after April 27 20%, and after May 1 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 65% of the 110 Kansas stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 20 in half of years, as early as October 3 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 10 days later, around October 30; in spring the one-in-ten date for 28°F is April 22, 9 days before the 32°F one. The freeze-free season lasts 183 days in a typical year, shorter than at 63% of the 110 Kansas stations; it reaches 202 days one year in ten and falls short of 164 one year in ten. On average 111 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 29, and return around October 9. Severe cold of 16°F or below comes every winter, usually between November 27 and March 7.

July is the warmest month at Ottawa, KS, averaging 89°F by day and 68°F at night; January is the coldest at 40°F and 18°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 10% of years.

Warmth for growing adds up to 3,963 growing degree days a year (base 50°F), fewer than at 69% of the 110 Kansas stations. 36% of them (1,415) have built up by the end of June, and July adds the most, 882. Precipitation totals 40.0 inches a year, most in May (5.8") and least in January (1.2"); May to September bring 60% of it.

The nearest other station, Hillsdale Lake, KS, 12 miles east of Wellsville, has a last frost 9 days earlier (April 9), a first frost 11 days later (October 31), a season 21 days longer.

The first measurable snow (0.1 inch or more) in Wellsville usually arrives around December 9, and the last of the season around March 1. Those are the middle dates across the winters of 1991–2020 at Ottawa, KS, 11.2 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 48 days after the last snow.

ZIP 66092 is 11 miles from Ottawa, KS, which stands at 905 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 66067 (Ottawa). The 2023 USDA Plant Hardiness Zone Map lists ZIP 66092 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.