Frost Dates for 43082 — Westerville, Ohio

Half of springs at Westerville, OH see their last 32°F night by April 22; only one in ten is past it by April 9, and one in ten still has one after May 10. Planting tender crops after April 28 leaves a 30% risk of a frost on them, after May 2 20%, and after May 10 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 76% of the 148 Ohio stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 24 in half of years, as early as October 10 one year in ten, and holds off past November 5 one year in ten. A hard freeze of 28°F follows 10 days later, around November 3; in spring the one-in-ten date for 28°F is April 24, 16 days before the 32°F one. The freeze-free season lasts 183 days in a typical year, longer than at 59% of the 148 Ohio stations; it reaches 201 days one year in ten and falls short of 161 one year in ten. On average 110 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 May 2, and return around October 12. Severe cold of 16°F or below comes every winter, usually between December 8 and March 8.

July is the warmest month at Westerville, OH, averaging 86°F by day and 65°F at night; January is the coldest at 38°F and 22°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 24% of years.

Warmth for growing adds up to 3,698 growing degree days a year (base 50°F), more than at 89% of the 148 Ohio stations. 37% of them (1,358) have built up by the end of June, and July adds the most, 787. Precipitation totals 42.3 inches a year, most in June (5.0") and least in February (2.4"); May to September bring 49% of it.

The nearest other station, Columbus Ohio State Univ Airport, OH, 10 miles southwest of Westerville, has the same 50% last-frost date, a first frost 1 day earlier (October 23).

The first measurable snow (0.1 inch or more) in Westerville usually arrives around December 9, and the last of the season around March 14. Those are the middle dates across the winters of 1991–2020 at Westerville, OH, 2.2 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 39 days after the last snow.

ZIP 43082 is 2 miles from Westerville, OH, which stands at 802 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 6 other ZIP codes share the station; its figures are presented in full for 43081 (Westerville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 43082 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.