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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 45°F | 69°F | 56°F | 2.3" |
| February | 46°F | 69°F | 56°F | 2.5" |
| March | 48°F | 71°F | 58°F | 1.2" |
| April | 50°F | 73°F | 61°F | 0.7" |
| May | 55°F | 74°F | 63°F | 0.5" |
| June | 59°F | 78°F | 67°F | 0.0" |
| July | 63°F | 82°F | 71°F | 0.3" |
| August | 64°F | 83°F | 72°F | 0.0" |
| September | 62°F | 84°F | 71°F | 0.2" |
| October | 56°F | 81°F | 67°F | 0.5" |
| November | 50°F | 76°F | 61°F | 1.0" |
| December | 45°F | 69°F | 55°F | 2.8" |
| Index | Del Mar | 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 Mesa, CA | 60,208 | 64 | 28.0% |
| Escondido, CA | 150,396 | 64 | 28.0% |
| San Marcos, CA | 96,219 | 64 | 28.0% |
| Poway, CA | 49,780 | 64 | 28.0% |
| Fairbanks Ranch, CA | 2,929 | 64 | 28.0% |
| Del Mar, CA | 4,331 | 64 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Cumberland, BC | 4,331 | n/a | |
| Selmer, TN | 4,330 | 27 | 46.0% |
| Fayette, AL | 4,329 | 35 | 30.0% |
| Dillon, MT | 4,333 | 20 | 60.0% |
| Woodruff, SC | 4,333 | 44 | 12.0% |
| Del Mar, CA | 4,331 | 64 | 28.0% |