| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 58°F | 48°F | 3.3" |
| February | 43°F | 62°F | 52°F | 3.0" |
| March | 45°F | 67°F | 54°F | 1.8" |
| April | 47°F | 71°F | 57°F | 1.9" |
| May | 52°F | 78°F | 63°F | 0.6" |
| June | 56°F | 85°F | 68°F | 0.0" |
| July | 58°F | 90°F | 71°F | 0.0" |
| August | 57°F | 90°F | 70°F | 0.0" |
| September | 56°F | 86°F | 68°F | 0.0" |
| October | 50°F | 77°F | 62°F | 1.4" |
| November | 45°F | 68°F | 55°F | 1.2" |
| December | 40°F | 57°F | 47°F | 2.3" |
| Index | San Pablo | California | National |
| Air quality index | 40 | 55 | 42 |
| Pollution index | 19,202,400 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 290 |
| Days with moderate air quality | 74 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.180% |
| Benzene | 0.140% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.280% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| Lafayette, CA | 25,949 | 40 | 20.0% |
| Pleasant Hill, CA | 34,903 | 40 | 20.0% |
| Moraga, CA | 16,896 | 40 | 20.0% |
| Piedmont, CA | 11,454 | 40 | 20.0% |
| Corte Madera, CA | 9,793 | 40 | 20.0% |
| San Pablo, CA | 30,959 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Morgantown, WV | 30,953 | 36 | 28.0% |
| Danville, IL | 30,969 | 42 | 16.0% |
| Chambly, QC | 30,986 | n/a | |
| Miami Lakes, FL | 31,021 | 41 | 18.0% |
| Centre Wellington, ON | 30,896 | n/a | |
| San Pablo, CA | 30,959 | 40 | 20.0% |
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