USDA Hardiness Zone 11a
Frost Dates for 92101 — San Diego, California
NOAA 1991–2020 normals from San Diego Lindbergh Field, CA (15 ft), 2 miles northwest.
Updated
No night at or below 32°F was recorded at San Diego Lindbergh Field, CA in 1991–2020, so San Diego has no frost dates to plan around; the coolest month, December, averages a low of 50°F.
- Winters with a freeze
- 0%
- Winters with 36°F
- 1%
- Coldest month low
- 50°F
- Hardiness zone
- 11a
32°F or below, 1991–2020
frost possible on leaves
average, December
40 to 45°F (4.4 to 7.2°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 San Diego
San Diego Lindbergh Field, CA, 2 miles northwest of San Diego, did not record a night at or below 32°F in 1991–2020; a 36°F night came in 1% 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 San Diego Lindbergh Field, 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 92101 →Compare San Diego with another place →
Weather by month in San Diego
August is the warmest month at San Diego Lindbergh Field, CA, averaging 77°F by day and 68°F at night; December is the coldest at 66°F and 50°F. Not one month recorded a 32°F night; the lowest monthly average low is 50°F.
Warmth for growing adds up to 5,379 growing degree days a year (base 50°F), more than at 76% of the 283 California stations. 41% of them (2,205) have built up by the end of June, and August adds the most, 694. Precipitation totals 10.0 inches a year, most in February (2.2") and least in August (0.0"); May to September bring 6% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 66 | 50 | 2.0 | 0% | 0 | 260 |
| Feb | 66 | 52 | 2.2 | 0% | 0 | 252 |
| Mar | 67 | 55 | 1.5 | 0% | 0 | 333 |
| Apr | 69 | 57 | 0.7 | 0% | 0 | 389 |
| May | 70 | 60 | 0.3 | 0% | 0 | 457 |
| Jun | 72 | 63 | 0.1 | 0% | 0 | 515 |
| Jul | 75 | 66 | 0.1 | 0% | 0 | 642 |
| Aug | 77 | 68 | 0.0 | 0% | 0 | 694 |
| Sep | 77 | 66 | 0.1 | 0% | 0 | 651 |
| Oct | 75 | 62 | 0.5 | 0% | 0 | 560 |
| Nov | 71 | 55 | 0.8 | 0% | 0 | 383 |
| Dec | 66 | 50 | 1.7 | 0% | 0 | 245 |
Monthly normals 1991–2020 at San Diego Lindbergh Field, CA (15 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, North Island NAS, CA, 3 miles southwest of San Diego, has the same share of winters with a 32°F night, 0%, and a coolest-month low 1°F colder (49°F).
When it snows in San Diego, California
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Chula Vista, CA, 7.1 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 92101 is 2 miles from San Diego Lindbergh Field, CA, which stands at 15 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 92105 (San Diego). The 2023 USDA Plant Hardiness Zone Map lists ZIP 92101 in zone 11a, the band where the coldest night of the year averaged 40 to 45°F (4.4 to 7.2°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.