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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 | Mount Hope | 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. |
| Bonita, CA | 12,470 | 64 | 28.0% |
| Jamul, CA | 5,776 | 64 | 28.0% |
| Spring Valley CDP (Lake County), CA | 1,154 | 64 | 28.0% |
| Crest, CA | 2,721 | 64 | 28.0% |
| Lakeside, CA | 21,032 | 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% |