Frost Dates for 95694 — Winters, California

Half of springs at Winters, CA see their last 32°F night by February 18; only one in ten is past it by January 17, and one in ten still has one after March 14. Planting tender crops after March 1 leaves a 30% risk of a frost on them, after March 7 20%, and after March 14 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 November 30 in half of years, as early as November 15 one year in ten, and holds off past December 18 one year in ten. A hard freeze of 28°F follows 15 days later, around December 15; in spring the one-in-ten date for 28°F is February 17, 25 days before the 32°F one. The freeze-free season lasts 284 days in a typical year, longer than at 55% of the 219 California stations; it reaches 322 days one year in ten and falls short of 253 one year in ten. On average 15 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 28 days longer, to about March 18, and return around November 15. A 24°F night is unusual: 37% of winters had one.

July is the warmest month at Winters, CA, averaging 95°F by day and 60°F at night; January is the coldest at 57°F and 38°F. A freezing night is all but certain in December (a 90% chance or more). From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 68% of years and March still brings one in 28% of years.

Warmth for growing adds up to 4,933 growing degree days a year (base 50°F), more than at 61% of the 283 California stations. 38% of them (1,894) have built up by the end of June, and July adds the most, 849. Precipitation totals 23.9 inches a year, most in January (5.2") and least in July (0.0"); May to September bring 5% of it.

The nearest other station, Davis 2 WSW Exp Farm, CA, 11 miles east of Winters, has a last frost 8 days earlier (February 10), a first frost 1 day later (December 1), a season 11 days longer.

Measurable snow is rare here: only 1 of 25 winters from 1991 to 2020 recorded 0.1 inch or more at Winters, CA, 0.8 miles away, so there is no typical first-snow date to plan around.

ZIP 95694 is under a mile from Winters, CA, which stands at 135 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 95694 in zone 9b, the band where the coldest night of the year averaged 25 to 30°F (-3.9 to -1.1°C) over 1991–2020; a zone describes winter lows, not frost dates.