Frost Dates for 96093 — Weaverville, California

Half of springs at Weaverville, CA see their last 32°F night by May 3; only one in ten is past it by April 16, and one in ten still has one after May 27. Planting tender crops after May 11 leaves a 30% risk of a frost on them, after May 16 20%, and after May 27 10%. The 24 days between the even-odds date and the one-in-ten date is narrower than at 74% of the 220 California stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.

In fall the first 32°F night comes by October 11 in half of years, as early as September 28 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 18 days later, around October 29; in spring the one-in-ten date for 28°F is April 30, 27 days before the 32°F one. The freeze-free season lasts 159 days in a typical year, shorter than at 90% of the 219 California stations; it reaches 188 days one year in ten and falls short of 131 one year in ten. On average 106 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 27 days longer, to about May 30, and return around September 28. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 46%.

July is the warmest month at Weaverville, CA, averaging 95°F by day and 52°F at night; December is the coldest at 47°F and 31°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 54% of years.

Warmth for growing adds up to 3,089 growing degree days a year (base 50°F), fewer than at 82% of the 283 California stations. 31% of them (952) have built up by the end of June, and July adds the most, 733. Precipitation totals 37.6 inches a year, most in December (7.7") and least in August (0.2"); May to September bring 10% of it.

The nearest other station, Trinity Rvr Hatchery, CA, 8 miles east of Weaverville and 197 feet lower, has a last frost 10 days earlier (April 23), a first frost 11 days later (October 22), a season 19 days longer.

The first measurable snow (0.1 inch or more) in Weaverville usually arrives around December 8, and the last of the season around March 2. Those are the middle dates across the winters of 1991–2020 at Weaverville, CA, 0.2 miles away: half of years saw snow earlier, half later. Snow fell in 68% of those winters. The last 32°F night of spring typically comes 62 days after the last snow.

ZIP 96093 is under a mile from Weaverville, CA, which stands at 2,058 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 96093 in zone 8b, the band where the coldest night of the year averaged 15 to 20°F (-9.4 to -6.7°C) over 1991–2020; a zone describes winter lows, not frost dates.