| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 45°F | 62°F | 52°F | 11.2" |
| February | 45°F | 61°F | 52°F | 3.4" |
| March | 46°F | 62°F | 53°F | 1.1" |
| April | 46°F | 62°F | 53°F | 20.7" |
| May | 49°F | 62°F | 55°F | 0.1" |
| June | 52°F | 64°F | 57°F | 0.0" |
| July | 54°F | 64°F | 58°F | 0.0" |
| August | 54°F | 65°F | 59°F | 0.0" |
| September | 54°F | 68°F | 60°F | 0.0" |
| October | 52°F | 69°F | 59°F | 0.3" |
| November | 48°F | 65°F | 55°F | 0.6" |
| December | 44°F | 60°F | 50°F | 0.1" |
| Index | Prunedale | California | National |
| Air quality index | 37 | 55 | 50 |
| Pollution index | 9,602,130 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 330 |
| Days with moderate air quality | 34 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.070% |
| Benzene | 0.190% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.080% |
| Mercury | 0.070% |
| City, State | Population | Air Quality Index | National Avg. |
| Freedom, CA | 2,774 | 35 | 30% |
| Seacliff, CA | 3,364 | 35 | 30% |
| Corralitos, CA | 2,557 | 35 | 30% |
| La Selva Beach, CA | 2,633 | 35 | 30% |
| Interlaken, CA | 6,738 | 35 | 30% |
| Prunedale, CA | 19,628 | 37 | 26% |
| City, State | Population | Air Quality Index | National Avg. |
| Mustang, OK | 19,637 | 48 | 4% |
| Willmar, MN | 19,641 | 32 | 36% |
| Madisonville, KY | 19,615 | 43 | 14% |
| Selma, AL | 19,650 | 52 | 4% |
| Eustis, FL | 19,661 | 37 | 26% |
| Prunedale, CA | 19,628 | 37 | 26% |
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