Corona, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Corona weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Foggy——90°55°—
- ThursdayJun 4Mostly Clear——94°56°+4°
- FridayJun 5Foggy——93°57°-1°
- SaturdayJun 6Overcast——86°67°-7°
- SundayJun 7Clear——86°63°0°
- MondayJun 8Clear——88°65°+2°
- TuesdayJun 9Clear——85°65°-3°
PM2.5 at 21.2 µg/m³ (AQI 74) with a 0.75 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust. AQI up 22 in the last 6 hours — air quality is degrading.
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
Ozone × UV × Sky
Ozone at AQI 32 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 8 by mid-afternoon.
- Present
- AQI 32
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 8
PM × Wind × Precip
PM2.5 at 21.2 µg/m³ (AQI 74) with a 0.75 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.75
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 6:03 AM
- Moonset
- 4:14 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Corona at a glance
- Today vs. normal: 17°F below the seasonal normal for this latitude
- Last frost: March 10 (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
August brings Corona's highest temperatures (~80°F mean), while December delivers the coldest conditions (~55°F). February sees peak rainfall at 2.7 inches, contrasting sharply with August's complete dry spell (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 56° | 2.2″ | 3 |
| February | 56° | 2.7″ | 4 |
| March | 59° | 1.4″ | 2 |
| April | 63° | 0.6″ | 1 |
| May | 68° | 0.2″ | 1 |
| June | 73° | 0.0″ | 0 |
| July | 78° | 0.1″ | 0 |
| August | 80° | 0.0″ | 0 |
| September | 77° | 0.1″ | 0 |
| October | 69° | 0.5″ | 1 |
| November | 61° | 0.6″ | 1 |
| December | 55° | 1.7″ | 3 |
Regional context
Corona falls within a hot-summer Mediterranean climate region, sharing similar temperature ranges, seasonal patterns, and growing conditions with surrounding cities in this climate zone.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, CA.
Naturalist notes
California poppies begin their spring bloom in Corona during late March, painting hillsides orange as winter rains fade.
House finches start their nesting season in April, with males displaying their brightest red plumage to attract mates.
Frequently asked
- When does it freeze in Corona?
- Spring's final frost in Corona typically occurs around mid-March, while the season's first frost returns around mid-December.
- What is the rainy season in Corona?
- February stands as the wettest month, delivering about 2.7 inches of rain on average, contributing to the city's annual total of roughly 10 inches.
- What is the warmest month in Corona?
- August typically brings the year's peak temperatures, averaging about 80°F.
- What is the coldest month in Corona?
- December usually marks the coldest period, with temperatures averaging about 55°F.
- When can I start a vegetable garden in Corona?
- Cool-season crops like peas and lettuce can be planted around the last spring frost in mid-March, while warm-season crops such as tomatoes and peppers should wait 1–2 weeks after.
- How many rainy days does Corona get?
- Corona experiences approximately 17 rainy days per year on average.
- What hardiness zone is Corona?
- Corona's USDA hardiness zone depends on its lowest average winter temperatures; consult the USDA's online lookup tool using the city ZIP code for the current zone designation.
Climate
Corona, California experiences a hot-summer Mediterranean climate. January temperatures typically hover near 56°F, while July averages reach 78°F — creating a 23°F seasonal swing.
Annual precipitation in Corona totals about 10 inches, distributed across roughly 17 rainy days throughout the year.
Weather patterns here follow the influence of latitude (33.9°N), proximity to large water bodies, and elevation. These factors determine what grows in the area, when frost occurs, and the daily weather characteristics.