USDA Hardiness Zone 10b
Frost Dates for 92626 — Costa Mesa, California
NOAA 1991–2020 normals from Santa Ana John Wayne Airport, CA (54 ft), 2 miles east.
Updated
No night at or below 32°F was recorded at Santa Ana John Wayne Airport, CA in 1991–2020, so Costa Mesa has no frost dates to plan around; the coolest month, December, averages a low of 48°F.
- Winters with a freeze
- 0%
- Winters with 36°F
- 12%
- Coldest month low
- 48°F
- Hardiness zone
- 10b
32°F or below, 1991–2020
frost possible on leaves
average, December
35 to 40°F (1.7 to 4.4°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 20 observed
NOAA normal
Frost risk by date in Costa Mesa
Santa Ana John Wayne Airport, CA, 2 miles east of Costa Mesa, did not record a night at or below 32°F in 1991–2020; a 36°F night came in 12% of winters. 10 of the 283 other California stations behind this site's ZIP pages recorded no 32°F night either.
Freeze probabilities 1991–2020 at Santa Ana John Wayne Airport, CA, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 92626 →Compare Costa Mesa with another place →
Weather by month in Costa Mesa
August is the warmest month at Santa Ana John Wayne Airport, CA, averaging 80°F by day and 67°F at night; December is the coldest at 67°F and 48°F. Not one month recorded a 32°F night; the lowest monthly average low is 48°F.
Warmth for growing adds up to 5,463 growing degree days a year (base 50°F), more than at 78% of the 283 California stations. 40% of them (2,192) have built up by the end of June, and August adds the most, 736. Precipitation totals 11.0 inches a year, most in January (2.6") and least in June (0.0"); May to September bring 4% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 67 | 49 | 2.6 | 0% | 0 | 244 |
| Feb | 67 | 50 | 2.6 | 0% | 0 | 236 |
| Mar | 68 | 52 | 1.6 | 0% | 0 | 310 |
| Apr | 70 | 55 | 0.5 | 0% | 0 | 377 |
| May | 71 | 59 | 0.3 | 0% | 0 | 474 |
| Jun | 74 | 63 | 0.0 | 0% | 0 | 551 |
| Jul | 79 | 66 | 0.0 | 0% | 0 | 699 |
| Aug | 80 | 67 | 0.0 | 0% | 0 | 736 |
| Sep | 80 | 65 | 0.1 | 0% | 0 | 674 |
| Oct | 77 | 59 | 0.5 | 0% | 0 | 553 |
| Nov | 72 | 53 | 0.8 | 0% | 0 | 378 |
| Dec | 67 | 48 | 2.0 | 0% | 0 | 231 |
Monthly normals 1991–2020 at Santa Ana John Wayne Airport, CA (54 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Santa Ana Fire Stn, CA, 5 miles northeast of Costa Mesa, has a 32°F night in 3% of winters against 0% here, and the same coolest-month low, 48°F.
When it snows in Costa Mesa, California
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Santa Ana Fire Stn, CA, 5.2 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 92626 is 2 miles from Santa Ana John Wayne Airport, CA, which stands at 54 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 5 other ZIP codes share the station; its figures are presented in full for 92708 (Fountain Valley). The 2023 USDA Plant Hardiness Zone Map lists ZIP 92626 in zone 10b, the band where the coldest night of the year averaged 35 to 40°F (1.7 to 4.4°C) over 1991–2020; a zone describes winter lows, not frost dates.
Frost dates across California →
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.