| 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 | National City | 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. |
| Coronado, CA | 24,526 | 64 | 28.0% |
| Lemon Grove, CA | 26,739 | 64 | 28.0% |
| Bostonia, CA | 17,532 | 64 | 28.0% |
| Granite Hills, CA | 4,020 | 64 | 28.0% |
| Santee, CA | 57,407 | 64 | 28.0% |
| National City, CA | 61,342 | 64 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Reston, VA | 61,418 | 47 | 6.0% |
| Spring, TX | 61,514 | 52 | 4.0% |
| Taylor, MI | 61,164 | 56 | 12.0% |
| Burnsville, MN | 61,536 | 46 | 8.0% |
| Aurora, ON | 61,058 | n/a | |
| National City, CA | 61,342 | 64 | 28.0% |
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