Rosamond, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Rosamond weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Clear——97°64°—
- FridayJun 5Clear——92°61°-5°
- SaturdayJun 6Overcast——85°61°-7°
- SundayJun 7Clear——86°57°+1°
- MondayJun 8Overcast——83°56°-3°
- TuesdayJun 9Overcast——71°55°-12°
- WednesdayJun 10Clear——75°48°+4°
Ozone at AQI 124 — peak already passed at 1 PM under clear skies. AQI up 54 in the last 6 hours — air quality is degrading. Levels should ease through evening.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 124 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 124
- UV peak
- 4.5 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 124
PM × Wind × Precip
PM10 at 35.7 µg/m³ (AQI 33) with a 0.31 fine-to-coarse ratio under 19 mph wind — coarse road or agricultural dust being kicked up.
- PM2.5/PM10
- 0.31
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- blown dust
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:09 AM
- Moonset
- 4:14 PM
- In sign
- ♒︎ Aquarius
Coastal fog thickens at dawn
Rosamond at a glance
- Today vs. normal: 14°F above the seasonal normal for this latitude
- Last frost: March 16 (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 4, 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
Rosamond's warmest month is July (~82°F mean) and its coldest is December (~44°F). Rainfall peaks in February (1.8 inches) and bottoms out in August (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 45° | 1.5″ | 3 |
| February | 48° | 1.8″ | 3 |
| March | 54° | 1.0″ | 2 |
| April | 59° | 0.4″ | 1 |
| May | 68° | 0.1″ | 0 |
| June | 76° | 0.1″ | 0 |
| July | 82° | 0.1″ | 0 |
| August | 81° | 0.0″ | 0 |
| September | 74° | 0.1″ | 0 |
| October | 63° | 0.3″ | 1 |
| November | 51° | 0.4″ | 1 |
| December | 44° | 1.1″ | 2 |
Regional context
Rosamond 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 Rosamond?
- Rosamond's last spring frost typically falls around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in Rosamond?
- February is the wettest month with about 1.8 inches of rain on average; the city receives roughly 7 inches annually.
- What is the warmest month in Rosamond?
- July is typically warmest, averaging about 82°F.
- What is the coldest month in Rosamond?
- December is typically coldest, averaging about 44°F.
- When can I start a vegetable garden in Rosamond?
- 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 Rosamond get?
- Rosamond averages about 15 rainy days per year.
- What hardiness zone is Rosamond?
- Rosamond'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
Rosamond, California sits in a hot-summer Mediterranean climate zone. January means hover near 45°F while July averages 82°F — a 37°F seasonal swing.
Across the year, Rosamond receives about 7 inches of precipitation spread over roughly 15 rainy days.
The rhythm of the year is set by latitude (34.9°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.