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| 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 | Vista | 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. |
| Camp Pendleton North, CA | 7,885 | 64 | 28.0% |
| Pala, CA | 1,094 | 64 | 28.0% |
| Escondido, CA | 150,396 | 64 | 28.0% |
| Rancho Santa Fe, CA | 2,657 | 64 | 28.0% |
| Camp Pendleton South, CA | 16,618 | 64 | 28.0% |
| Vista, CA | 100,659 | 64 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Tuscaloosa, AL | 100,633 | 35 | 30.0% |
| San Angelo, TX | 100,509 | 28 | 44.0% |
| Vacaville, CA | 99,958 | 35 | 30.0% |
| Lethbridge, AB | 101,384 | n/a | |
| Kamloops, BC | 101,505 | n/a | |
| Vista, CA | 100,659 | 64 | 28.0% |
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