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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 44°F | 58°F | 51°F | 3.2" | 
| February | 46°F | 62°F | 53°F | 3.4" | 
| March | 47°F | 64°F | 54°F | 2.7" | 
| April | 49°F | 67°F | 56°F | 1.7" | 
| May | 51°F | 69°F | 58°F | 0.3" | 
| June | 54°F | 72°F | 61°F | 0.2" | 
| July | 56°F | 73°F | 62°F | 0.0" | 
| August | 56°F | 73°F | 62°F | 0.0" | 
| September | 56°F | 76°F | 63°F | 0.1" | 
| October | 54°F | 73°F | 62°F | 1.0" | 
| November | 49°F | 65°F | 56°F | 1.7" | 
| December | 44°F | 58°F | 51°F | 4.4" | 
| Index | Visitacion Valley | San Francisco | California | 
| Air quality index | 40 | 40 | 55 | 
| Pollution index | 8,232,360 | 8,232,360 | 10,473,190 | 
| 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 | 0.010% | 
| Benzene | 0.060% | 
| Carbon Tetrachloride | 0.000% | 
| Lead | 0.010% | 
| Mercury | 0.010% | 
| City | Population | Air Quality Index | National Avg. | 
| San Leandro, CA | 90,489 | 40 | 20.0% | 
| Oakland, CA | 422,575 | 40 | 20.0% | 
| Corte Madera, CA | 9,793 | 40 | 20.0% | 
| Sausalito, CA | 7,177 | 40 | 20.0% | 
| Tamalpais-Homestead Valley, CA | 12,331 | 40 | 20.0% | 
| San Francisco, CA | 874,784 | 40 | 20.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Charlotte, NC | 873,570 | 49 | 2.0% | 
| Indianapolis, IN | 869,387 | 54 | 8.0% | 
| Columbus, OH | 889,079 | 46 | 8.0% | 
| Fort Worth, TX | 892,221 | 51 | 2.0% | 
| Jacksonville, FL | 902,488 | 43 | 14.0% | 
| San Francisco, CA | 874,784 | 40 | 20.0% |