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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 48°F | 67°F | 57°F | 1.2" |
| February | 49°F | 66°F | 57°F | 0.7" |
| March | 50°F | 67°F | 59°F | 1.0" |
| April | 52°F | 68°F | 60°F | 0.3" |
| May | 57°F | 69°F | 63°F | 0.2" |
| June | 60°F | 71°F | 66°F | 0.0" |
| July | 64°F | 74°F | 69°F | 0.2" |
| August | 65°F | 76°F | 70°F | 0.0" |
| September | 62°F | 77°F | 70°F | 0.1" |
| October | 56°F | 75°F | 66°F | 0.2" |
| November | 52°F | 72°F | 62°F | 0.4" |
| December | 47°F | 66°F | 56°F | 1.4" |
| Index | Imperial Beach | California | National |
| Air quality index | 64 | 55 | 42 |
| Pollution index | 45,820,500 | 10,473,190 | 2,726,193 |
| 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. |
| Jamul, CA | 5,776 | 64 | 28.0% |
| San Diego, CA | 1,414,545 | 64 | 28.0% |
| La Mesa, CA | 60,208 | 64 | 28.0% |
| Rancho San Diego, CA | 21,476 | 64 | 28.0% |
| Bonita, CA | 12,470 | 64 | 28.0% |
| Imperial Beach, CA | 27,334 | 64 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Citrus Park, FL | 27,333 | 43 | 14.0% |
| Bixby, OK | 27,315 | 45 | 10.0% |
| Round Lake Beach, IL | 27,313 | 39 | 22.0% |
| Gladstone, MO | 27,365 | 47 | 6.0% |
| Bergenfield, NJ | 27,375 | 51 | 2.0% |
| Imperial Beach, CA | 27,334 | 64 | 28.0% |