Frost Dates for 92544 — Hemet, California

In the 67% of winters that bring a 32°F night, half of springs at Hemet, CA see their last 32°F night by January 10; only one in ten is past it by December 14, and one in ten still has one after February 25. Counting the winters with no freeze at all, the risk of a 32°F night after February 25 is under 7% and after January 10 34%. The 46 days between the even-odds date and the one-in-ten date is wider than at 95% 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 December 23 in half of years, as early as November 27 one year in ten, and holds off past January 31 one year in ten. A hard freeze of 28°F is less common: it came in 17% of winters. The freeze-free season lasts 350 days in a typical year, longer than at 94% of the 219 California stations; it reaches 365 days one year in ten and falls short of 306 one year in ten. On average 13 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 42 days longer, to about February 21, and return around December 9. A 24°F night is unusual: 0% of winters had one.

August is the warmest month at Hemet, CA, averaging 97°F by day and 66°F at night; December is the coldest at 65°F and 43°F. From March to November the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 15% of years.

Warmth for growing adds up to 6,049 growing degree days a year (base 50°F), more than at 91% of the 283 California stations. 37% of them (2,259) have built up by the end of June, and August adds the most, 966. Precipitation totals 11.7 inches a year, most in February (2.8") and least in June (0.1"); May to September bring 11% of it.

The nearest other station, San Jacinto, CA, 7 miles northwest of Hemet and 286 feet lower, has a last frost 21 days later (January 31), a first frost 13 days earlier (December 10), a season 35 days shorter.

Measurable snow is rare here: only 0 of 22 winters from 1991 to 2020 recorded 0.1 inch or more at Hemet, CA, 2.2 miles away, so there is no typical first-snow date to plan around.

ZIP 92544 is 2 miles from Hemet, CA, which stands at 1,811 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 92544 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.