USDA Hardiness Zone 10a
Frost Dates for 91343 — North Hills, California
NOAA 1991–2020 normals from Van Nuys Airport, CA (770 ft), 2 miles south.
Updated
Frost is not a yearly event in North Hills: a night at or below 32°F came in 22% of the winters of 1991–2020 at Van Nuys Airport, CA, and a 36°F night, cold enough for frost on exposed leaves, in 82%. There is no reliable "last frost date" here; most years have none.
- Winters with a freeze
- 22%
- Winters with 36°F
- 82%
- Coldest month low
- 45°F
- Hardiness zone
- 10a
32°F or below, 1991–2020
frost possible on leaves
average, December
30 to 35°F (-1.1 to 1.7°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 North Hills
At Van Nuys Airport, CA, 2 miles south of North Hills, 22% of the winters of 1991–2020 had at least one night at or below 32°F, 1% reached 28°F. Nights of 36°F, enough for frost on exposed leaves, are more common (82% of winters) and, when they come, fall between about December 22 and January 19. December is the month most likely to bring one: a 11% chance in a given year. 62 of the 283 other California stations behind this site's ZIP pages freeze in fewer than half of winters too.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F82% of yrs | Dec 18 | Dec 30 | Jan 4 | Jan 11 | Jan 19 | Jan 27 | Feb 3 | Feb 15 | Feb 27 |
| 32°F22% of yrs | too rare for a date | ||||||||
| 28°F1% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F82% of yrs | Dec 1 | Dec 7 | Dec 12 | Dec 16 | Dec 22 | Dec 27 | Jan 1 | Jan 8 | Jan 23 |
| 32°F22% of yrs | too rare for a date | ||||||||
| 28°F1% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Van Nuys 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 91343 →Compare North Hills with another place →
Weather by month in North Hills
August is the warmest month at Van Nuys Airport, CA, averaging 93°F by day and 65°F at night; December is the coldest at 67°F and 45°F. From January to November the chance of a 32°F night stays under 10% each month.
Warmth for growing adds up to 6,119 growing degree days a year (base 50°F), more than at 93% of the 283 California stations. 39% of them (2,383) have built up by the end of June, and August adds the most, 899. Precipitation totals 13.6 inches a year, most in February (3.8") and least in July (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 | 68 | 46 | 2.8 | 9% | <1 | 232 |
| Feb | 68 | 46 | 3.8 | 1% | 0 | 214 |
| Mar | 72 | 49 | 2.5 | 0% | 0 | 333 |
| Apr | 75 | 52 | 0.7 | 0% | 0 | 402 |
| May | 79 | 56 | 0.3 | 0% | 0 | 543 |
| Jun | 84 | 60 | 0.1 | 0% | 0 | 660 |
| Jul | 91 | 64 | 0.0 | 0% | 0 | 860 |
| Aug | 93 | 65 | 0.0 | 0% | 0 | 899 |
| Sep | 90 | 63 | 0.1 | 0% | 0 | 796 |
| Oct | 83 | 57 | 0.5 | 0% | 0 | 612 |
| Nov | 75 | 49 | 0.8 | 1% | 0 | 366 |
| Dec | 67 | 45 | 2.0 | 11% | <1 | 202 |
Monthly normals 1991–2020 at Van Nuys Airport, CA (770 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, Northridge Cal State, CA, 2 miles west of North Hills, has a 32°F night in 18% of winters against 22% here, and a coolest-month low 1°F warmer (46°F).
When it snows in North Hills, California
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Woodland Hills Pierce College, CA, 6.6 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 91343 is 2 miles from Van Nuys Airport, CA, which stands at 770 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 10 other ZIP codes share the station; its figures are presented in full for 91331 (Pacoima). The 2023 USDA Plant Hardiness Zone Map lists ZIP 91343 in zone 10a, the band where the coldest night of the year averaged 30 to 35°F (-1.1 to 1.7°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.