Clarksburg, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Clarksburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——89°56°—
- ThursdayJun 4Clear——94°57°+5°
- FridayJun 5Overcast——97°57°+3°
- SaturdayJun 6Overcast——86°56°-11°
- SundayJun 7Overcast——87°50°+1°
- MondayJun 8Light Drizzle13%0.08″84°56°-3°
- TuesdayJun 9Light Drizzle—0.01″81°58°-3°
PM2.5/PM10 ratio 0.70 with 10 mph wind — characteristic of long-range haze transport rather than a local source. AQI projected to ease from current levels toward 40 over the next 6 hours.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 AM.
What's driving it
PM × Wind × Precip
PM2.5/PM10 ratio 0.70 with 10 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.70
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:33 AM
- Moonset
- 4:18 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Clarksburg at a glance
- Today vs. normal: 8°F below the seasonal normal for this latitude
- Last frost: April 7 (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 | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Clarksburg's warmest month is July (~78°F mean) and its coldest is December (~49°F). Rainfall peaks in January (3.9 inches) and bottoms out in July (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 49° | 3.9″ | 7 |
| February | 53° | 3.6″ | 7 |
| March | 57° | 2.8″ | 6 |
| April | 61° | 1.4″ | 3 |
| May | 68° | 0.9″ | 2 |
| June | 74° | 0.2″ | 1 |
| July | 78° | 0.0″ | 0 |
| August | 77° | 0.0″ | 0 |
| September | 74° | 0.1″ | 0 |
| October | 66° | 0.9″ | 2 |
| November | 55° | 1.8″ | 4 |
| December | 49° | 3.5″ | 6 |
Frequently asked
- When does it freeze in Clarksburg?
- Clarksburg's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Clarksburg?
- January is the wettest month with about 3.9 inches of rain on average; the city receives roughly 19 inches annually.
- What is the warmest month in Clarksburg?
- July is typically warmest, averaging about 78°F.
- What is the coldest month in Clarksburg?
- December is typically coldest, averaging about 49°F.
- When can I start a vegetable garden in Clarksburg?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-April); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Clarksburg get?
- Clarksburg averages about 38 rainy days per year.
- What hardiness zone is Clarksburg?
- Clarksburg'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
Clarksburg, California sits in a hot-summer Mediterranean climate zone. January means hover near 49°F while July averages 78°F — a 29°F seasonal swing.
Across the year, Clarksburg receives about 19 inches of precipitation spread over roughly 38 rainy days.
The rhythm of the year is set by latitude (38.4°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.