Frost Dates for 41003 — Berry, Kentucky

Half of springs at Williamstown, KY see their last 32°F night by April 11; only one in ten is past it by March 28, and one in ten still has one after April 30. Planting tender crops after April 17 leaves a 30% risk of a frost on them, after April 22 20%, and after April 30 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 76% of the 113 Kentucky stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 29 in half of years, as early as October 14 one year in ten, and holds off past November 11 one year in ten. A hard freeze of 28°F follows 10 days later, around November 8; in spring the one-in-ten date for 28°F is April 17, 13 days before the 32°F one. The freeze-free season lasts 199 days in a typical year, longer than at 63% of the 113 Kentucky stations; it reaches 219 days one year in ten and falls short of 175 one year in ten. On average 91 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 24, and return around October 18. Severe cold of 16°F or below comes every winter, usually between December 15 and February 28.

July is the warmest month at Williamstown, KY, averaging 87°F by day and 66°F at night; January is the coldest at 42°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 80% of years.

Warmth for growing adds up to 4,117 growing degree days a year (base 50°F), more than at 59% of the 113 Kentucky stations. 37% of them (1,520) have built up by the end of June, and July adds the most, 828. Precipitation totals 45.9 inches a year, most in June (5.0") and least in October (3.0"); May to September bring 46% of it.

The nearest other station, Cynthiana, KY, 12 miles southeast of Berry and 269 feet lower, has a last frost 7 days later (April 18), a first frost 6 days earlier (October 23), a season 11 days shorter.

The first measurable snow (0.1 inch or more) in Berry usually arrives around December 24, and the last of the season around January 25. Those are the middle dates across the winters of 1991–2020 at Cynthiana, KY, 11.9 miles away: half of years saw snow earlier, half later. Snow fell in 56% of those winters. The last 32°F night of spring typically comes 76 days after the last snow.

ZIP 41003 is 12 miles from Williamstown, KY, which stands at 969 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 8 other ZIP codes share the station; its figures are presented in full for 41035 (Dry Ridge). The 2023 USDA Plant Hardiness Zone Map lists ZIP 41003 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.