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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 60°F | 48°F | 2.5" |
| February | 42°F | 65°F | 53°F | 2.6" |
| March | 46°F | 69°F | 56°F | 2.7" |
| April | 48°F | 74°F | 60°F | 1.5" |
| May | 52°F | 79°F | 63°F | 0.1" |
| June | 56°F | 87°F | 69°F | 0.4" |
| July | 58°F | 90°F | 71°F | 0.0" |
| August | 58°F | 88°F | 70°F | 0.0" |
| September | 57°F | 88°F | 70°F | 0.1" |
| October | 52°F | 80°F | 64°F | 0.7" |
| November | 44°F | 67°F | 54°F | 1.6" |
| December | 39°F | 60°F | 49°F | 3.1" |
| Index | Oakley | California | National |
| Air quality index | 45 | 55 | 42 |
| Pollution index | 13,698,500 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 229 |
| Days with moderate air quality | 123 |
| Days w/ poor A.Q. for sensitive groups | 12 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.110% |
| Carbon Tetrachloride | 0.330% |
| Lead | 0.070% |
| Mercury | 0.120% |
| City | Population | Air Quality Index | National Avg. |
| Blackhawk, CA | 10,590 | 40 | 20.0% |
| Camino Tassajara, CA | 5,870 | 40 | 20.0% |
| Pittsburg, CA | 71,723 | 40 | 20.0% |
| Diablo, CA | 834 | 40 | 20.0% |
| Clayton, CA | 11,585 | 40 | 20.0% |
| Oakley, CA | 41,656 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Westfield, IN | 41,652 | 54 | 8.0% |
| La Quinta, CA | 41,650 | 89 | 78.0% |
| Huntsville, TX | 41,664 | 52 | 4.0% |
| Mableton, GA | 41,647 | 52 | 4.0% |
| Puyallup, WA | 41,666 | 30 | 40.0% |
| Oakley, CA | 41,656 | 45 | 10.0% |
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