| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 59°F | 50°F | 2.8" |
| February | 45°F | 62°F | 53°F | 3.1" |
| March | 47°F | 65°F | 55°F | 2.9" |
| April | 49°F | 67°F | 57°F | 1.8" |
| May | 52°F | 69°F | 59°F | 0.4" |
| June | 54°F | 72°F | 62°F | 0.3" |
| July | 56°F | 73°F | 63°F | 0.0" |
| August | 57°F | 73°F | 63°F | 0.0" |
| September | 55°F | 76°F | 64°F | 0.1" |
| October | 52°F | 73°F | 61°F | 1.0" |
| November | 47°F | 65°F | 56°F | 1.9" |
| December | 42°F | 59°F | 50°F | 4.1" |
| Index | Piedmont | 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. |
| Acalanes Ridge, CA | 902 | 40 | 20.0% |
| Concord, CA | 133,378 | 40 | 20.0% |
| North Gate, CA | 758 | 40 | 20.0% |
| Reliez Valley, CA | 3,394 | 40 | 20.0% |
| Shell Ridge, CA | 1,112 | 40 | 20.0% |
| Piedmont, CA | 11,734 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Upper Montclair, NJ | 11,734 | 51 | 2.0% |
| Mendota Heights, MN | 11,733 | 46 | 8.0% |
| Pontiac, IL | 11,732 | 44 | 12.0% |
| Gardnerville Ranchos, NV | 11,732 | 13 | 74.0% |
| Hamilton, ON | 11,739 | n/a | |
| Piedmont, CA | 11,734 | 40 | 20.0% |