| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 63°F | 50°F | 3.5" |
| February | 42°F | 64°F | 52°F | 2.9" |
| March | 44°F | 65°F | 53°F | 3.5" |
| April | 45°F | 68°F | 55°F | 1.6" |
| May | 48°F | 70°F | 57°F | 0.3" |
| June | 51°F | 73°F | 60°F | 0.2" |
| July | 54°F | 73°F | 61°F | 0.0" |
| August | 54°F | 73°F | 62°F | 0.0" |
| September | 53°F | 76°F | 62°F | 0.1" |
| October | 50°F | 75°F | 60°F | 0.9" |
| November | 44°F | 68°F | 54°F | 1.7" |
| December | 39°F | 62°F | 49°F | 3.6" |
| Index | Seacliff | California | National |
| Air quality index | 35 | 55 | 42 |
| Pollution index | 5,429,550 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 347 |
| Days with moderate air quality | 18 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.050% |
| Mercury | 0.150% |
| City | Population | Air Quality Index | National Avg. |
| Brookdale, CA | 1,293 | 35 | 30.0% |
| Aptos, CA | 6,245 | 35 | 30.0% |
| Capitola, CA | 10,090 | 35 | 30.0% |
| La Selva Beach, CA | 2,544 | 35 | 30.0% |
| Pajaro Dunes, CA | 235 | 35 | 30.0% |
| Seacliff, CA | 3,580 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Piggott, AR | 3,579 | 26 | 48.0% |
| Centre, AL | 3,581 | 39 | 22.0% |
| Balmville, NY | 3,581 | 36 | 28.0% |
| Greenhills, OH | 3,581 | 54 | 8.0% |
| Grasonville, MD | 3,578 | 41 | 18.0% |
| Seacliff, CA | 3,580 | 35 | 30.0% |
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