| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 59°F | 47°F | 2.6" |
| February | 41°F | 63°F | 51°F | 2.6" |
| March | 43°F | 67°F | 54°F | 2.1" |
| April | 45°F | 72°F | 57°F | 1.4" |
| May | 50°F | 78°F | 62°F | 0.3" |
| June | 54°F | 85°F | 67°F | 0.2" |
| July | 58°F | 90°F | 71°F | 0.0" |
| August | 57°F | 89°F | 70°F | 0.0" |
| September | 56°F | 88°F | 69°F | 0.1" |
| October | 50°F | 79°F | 63°F | 0.9" |
| November | 43°F | 67°F | 54°F | 1.5" |
| December | 38°F | 60°F | 48°F | 2.8" |
| Index | Pleasanton | California | National |
| Air quality index | 43 | 55 | 50 |
| Pollution index | 6,427,290 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 263 |
| Days with moderate air quality | 98 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.110% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.003% |
| City, State | Population | Air Quality Index | National Avg. |
| Blackhawk, CA | 9,468 | 40 | 20% |
| Danville, CA | 43,758 | 40 | 20% |
| Alamo, CA | 16,078 | 40 | 20% |
| Camino Tassajara, CA | 3,456 | 40 | 20% |
| Diablo, CA | 807 | 40 | 20% |
| Pleasanton, CA | 77,046 | 43 | 14% |
| City, State | Population | Air Quality Index | National Avg. |
| St. Joseph, MO | 76,901 | 43 | 14% |
| Chino Hills, CA | 77,266 | 89 | 78% |
| Alameda, CA | 77,409 | 40 | 20% |
| Baldwin Park, CA | 76,511 | 72 | 44% |
| Bellflower, CA | 77,687 | 72 | 44% |
| Pleasanton, CA | 77,046 | 43 | 14% |
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