Crestline, California Weather
Coastal fog thickens at dawn. Day 76 of spring. Read this microseason across nine climate regions →
Crestline weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Clear——79°58°—
- ThursdayJun 4Clear——77°62°-2°
- FridayJun 5Clear——81°56°+4°
- SaturdayJun 6Overcast——73°52°-8°
- SundayJun 7Overcast——71°47°-2°
- MondayJun 8Overcast——76°45°+5°
- TuesdayJun 9Mostly Clear——76°48°0°
Ozone at AQI 154 — peak already passed at 1 PM under clear skies. AQI up 53 in the last 6 hours — air quality is degrading. Levels should ease through evening.
LIMIT OUTDOORS Limit prolonged outdoor exertion. Sensitive groups should avoid outdoor exertion. Consider rescheduling outdoor activities until AQI improves.
What's driving it
Ozone × UV × Sky
Ozone at AQI 154 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 154
- UV peak
- 4.0 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 154
PM × Wind × Precip
PM2.5/PM10 ratio 0.57 with 11 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.57
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- transport
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
The higher the clouds, the finer the weather.
- Moonrise
- 5:24 AM
- Moonset
- 3:11 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Crestline at a glance
- Today vs. normal: 6°F below the seasonal normal for this latitude
- Last frost: March 12 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 3, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | — | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | — | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | fall brassicas, garlic (overwinter), carrots | — |
| December | — | — |
A year in weather
Crestline's warmest month is August (~80°F mean) and its coldest is December (~53°F). Rainfall peaks in February (3.0 inches) and bottoms out in August (0.1 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 54° | 2.8″ | 5 |
| February | 55° | 3.0″ | 5 |
| March | 58° | 2.0″ | 4 |
| April | 62° | 0.9″ | 2 |
| May | 66° | 0.3″ | 1 |
| June | 72° | 0.1″ | 0 |
| July | 79° | 0.1″ | 1 |
| August | 80° | 0.1″ | 0 |
| September | 76° | 0.1″ | 0 |
| October | 68° | 0.5″ | 1 |
| November | 60° | 0.9″ | 2 |
| December | 53° | 2.0″ | 4 |
Regional context
Crestline sits within a hot-summer Mediterranean climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, CA.
Frequently asked
- When does it freeze in Crestline?
- Crestline's last spring frost typically falls around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in Crestline?
- February is the wettest month with about 3.0 inches of rain on average; the city receives roughly 13 inches annually.
- What is the warmest month in Crestline?
- August is typically warmest, averaging about 80°F.
- What is the coldest month in Crestline?
- December is typically coldest, averaging about 53°F.
- When can I start a vegetable garden in Crestline?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-March); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Crestline get?
- Crestline averages about 24 rainy days per year.
- What hardiness zone is Crestline?
- Crestline's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Crestline, California sits in a hot-summer Mediterranean climate zone. January means hover near 54°F while July averages 79°F — a 25°F seasonal swing.
Across the year, Crestline receives about 13 inches of precipitation spread over roughly 24 rainy days.
The rhythm of the year is set by latitude (34.2°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.