Frost Dates for 26170 — Saint Marys, West Virginia

Half of springs at Newport, OH see their last 32°F night by April 23; only one in ten is past it by April 10, and one in ten still has one after May 10. Planting tender crops after April 30 leaves a 30% risk of a frost on them, after May 4 20%, and after May 10 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 61% of the 84 West Virginia stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 26 in half of years, as early as October 12 one year in ten, and holds off past November 6 one year in ten. A hard freeze of 28°F follows 8 days later, around November 3; in spring the one-in-ten date for 28°F is April 25, 15 days before the 32°F one. The freeze-free season lasts 185 days in a typical year, longer than at 69% of the 84 West Virginia stations; it reaches 204 days one year in ten and falls short of 164 one year in ten. On average 119 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 3, and return around October 17. Severe cold of 16°F or below comes every winter, usually between December 10 and March 7.

July is the warmest month at Newport, OH, averaging 84°F by day and 64°F at night; January is the coldest at 39°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 26% of years.

Warmth for growing adds up to 3,408 growing degree days a year (base 50°F), more than at 63% of the 84 West Virginia stations. 35% of them (1,207) have built up by the end of June, and July adds the most, 744. Precipitation totals 45.6 inches a year, most in July (4.9") and least in October (2.9"); May to September bring 48% of it.

The nearest other station, Harrisville, WV, 12 miles southeast of Saint Marys, has a last frost 3 days later (April 26), a first frost 9 days earlier (October 17), a season 12 days shorter.

The first measurable snow (0.1 inch or more) in Saint Marys usually arrives around December 15, and the last of the season around March 11. Those are the middle dates across the winters of 1991–2020 at Newport, OH, 3 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 43 days after the last snow.

ZIP 26170 is 3 miles from Newport, OH, which stands at 676 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 26170 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.