| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 49°F | 68°F | 58°F | 2.0" |
| February | 51°F | 68°F | 59°F | 1.8" |
| March | 54°F | 69°F | 61°F | 1.1" |
| April | 56°F | 70°F | 63°F | 0.6" |
| May | 60°F | 71°F | 65°F | 0.3" |
| June | 63°F | 73°F | 67°F | 0.0" |
| July | 67°F | 77°F | 71°F | 0.2" |
| August | 68°F | 78°F | 72°F | 0.1" |
| September | 66°F | 79°F | 72°F | 0.2" |
| October | 61°F | 77°F | 68°F | 0.7" |
| November | 55°F | 73°F | 64°F | 0.9" |
| December | 50°F | 68°F | 58°F | 2.3" |
| Index | Coronado | 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. |
| La Presa, CA | 37,410 | 64 | 28.0% |
| Spring Valley CDP (Lake County), CA | 1,154 | 64 | 28.0% |
| El Cajon, CA | 103,249 | 64 | 28.0% |
| Winter Gardens, CA | 22,785 | 64 | 28.0% |
| Bonita, CA | 12,470 | 64 | 28.0% |
| Coronado, CA | 24,526 | 64 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Homer Glen, IL | 24,521 | 55 | 10.0% |
| Ottumwa, IA | 24,505 | 29 | 42.0% |
| Rockville Centre, NY | 24,552 | 51 | 2.0% |
| Key West, FL | 24,495 | 34 | 32.0% |
| Norton Shores, MI | 24,557 | 38 | 24.0% |
| Coronado, CA | 24,526 | 64 | 28.0% |
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