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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 49°F | 68°F | 58°F | 1.7" | 
| February | 51°F | 68°F | 59°F | 1.8" | 
| March | 54°F | 69°F | 60°F | 1.0" | 
| April | 56°F | 70°F | 62°F | 0.6" | 
| May | 60°F | 70°F | 64°F | 0.4" | 
| June | 62°F | 72°F | 66°F | 0.0" | 
| July | 66°F | 76°F | 70°F | 0.2" | 
| August | 67°F | 78°F | 71°F | 0.0" | 
| September | 66°F | 78°F | 71°F | 0.2" | 
| October | 61°F | 77°F | 68°F | 0.5" | 
| November | 55°F | 73°F | 63°F | 0.9" | 
| December | 49°F | 67°F | 58°F | 2.2" | 
| Index | Tijuana River Valley | San Diego | California | 
| Air quality index | 64 | 64 | 55 | 
| Pollution index | 45,820,500 | 45,820,500 | 10,473,190 | 
| Measurement | Total | 
| Days measured | 365 | 
| Days with good air quality | 87 | 
| Days with moderate air quality | 253 | 
| Days w/ poor A.Q. for sensitive groups | 23 | 
| Days with unhealthy air quality | 2 | 
| Pollutant | Total | 
| Arsenic | 1.130% | 
| Benzene | 0.410% | 
| Carbon Tetrachloride | 0.030% | 
| Lead | 0.600% | 
| Mercury | 0.080% | 
| City | Population | Air Quality Index | National Avg. | 
| Chula Vista, CA | 268,779 | 64 | 28.0% | 
| La Presa, CA | 37,410 | 64 | 28.0% | 
| Spring Valley, CA | 31,866 | 64 | 28.0% | 
| Coronado, CA | 24,526 | 64 | 28.0% | 
| Lemon Grove, CA | 26,739 | 64 | 28.0% | 
| San Diego, CA | 1,414,545 | 64 | 28.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Calgary, AB | 1,371,990 | n/a | |
| Dallas, TX | 1,338,846 | 51 | 2.0% | 
| San Antonio, TX | 1,529,133 | 49 | 2.0% | 
| Philadelphia, PA | 1,581,531 | 51 | 2.0% | 
| Phoenix, AZ | 1,658,422 | 74 | 48.0% | 
| San Diego, CA | 1,414,545 | 64 | 28.0% |