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. |
Castro Valley, CA | 64,392 | 40 | 20.0% |
San Leandro, CA | 90,489 | 40 | 20.0% |
Brisbane, CA | 4,645 | 40 | 20.0% |
Emeryville, CA | 11,679 | 40 | 20.0% |
San Francisco, CA | 874,784 | 40 | 20.0% |
Piedmont, CA | 11,454 | 40 | 20.0% |
City | Population | Air Quality Index | National Avg. |
Lyndon, KY | 11,451 | 49 | 2.0% |
Madison Heights, VA | 11,447 | 26 | 48.0% |
Elizabethtown, PA | 11,445 | 41 | 18.0% |
Milford, DE | 11,463 | 42 | 16.0% |
Magalia, CA | 11,444 | 46 | 8.0% |
Piedmont, CA | 11,454 | 40 | 20.0% |