| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 48°F | 67°F | 56°F | 1.8" |
| February | 49°F | 66°F | 56°F | 2.0" |
| March | 51°F | 67°F | 58°F | 1.1" |
| April | 54°F | 68°F | 60°F | 0.7" |
| May | 58°F | 69°F | 63°F | 0.4" |
| June | 61°F | 71°F | 65°F | 0.0" |
| July | 65°F | 75°F | 69°F | 0.1" |
| August | 66°F | 76°F | 70°F | 0.1" |
| September | 64°F | 77°F | 70°F | 0.1" |
| October | 59°F | 75°F | 67°F | 0.5" |
| November | 53°F | 71°F | 61°F | 1.0" |
| December | 48°F | 66°F | 56°F | 2.7" |
| Index | Encinitas | 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. |
| Valley Center, CA | 11,320 | 64 | 28.0% |
| Fairbanks Ranch, CA | 2,929 | 64 | 28.0% |
| San Marcos, CA | 96,219 | 64 | 28.0% |
| Poway, CA | 49,780 | 64 | 28.0% |
| Carlsbad, CA | 114,411 | 64 | 28.0% |
| Encinitas, CA | 62,967 | 64 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Brentwood, CA | 63,013 | 45 | 10.0% |
| West Hartford, CT | 63,023 | 41 | 18.0% |
| La Habra, CA | 62,787 | 72 | 44.0% |
| Brentwood, NY | 62,743 | 43 | 14.0% |
| Springfield, OR | 62,729 | 38 | 24.0% |
| Encinitas, CA | 62,967 | 64 | 28.0% |
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