| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 68°F | 52°F | 2.7" |
| February | 41°F | 68°F | 53°F | 2.3" |
| March | 43°F | 70°F | 55°F | 1.9" |
| April | 44°F | 71°F | 56°F | 1.1" |
| May | 47°F | 71°F | 58°F | 0.3" |
| June | 51°F | 73°F | 60°F | 0.2" |
| July | 54°F | 75°F | 62°F | 0.0" |
| August | 55°F | 75°F | 62°F | 0.1" |
| September | 53°F | 78°F | 63°F | 0.1" |
| October | 50°F | 78°F | 61°F | 0.7" |
| November | 44°F | 73°F | 57°F | 1.0" |
| December | 39°F | 67°F | 51°F | 2.3" |
| Index | Nipomo | California | National |
| Air quality index | 46 | 55 | 42 |
| Pollution index | 5,611,110 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 230 |
| Days with moderate air quality | 132 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.060% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Callender, CA | 1,638 | 46 | 8.0% |
| Grover Beach, CA | 13,481 | 46 | 8.0% |
| Oceano, CA | 7,601 | 46 | 8.0% |
| Sisquoc, CA | 169 | 46 | 8.0% |
| Arroyo Grande, CA | 17,924 | 46 | 8.0% |
| Nipomo, CA | 18,182 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Maumelle, AR | 18,193 | 45 | 10.0% |
| Newburyport, MA | 18,197 | 37 | 26.0% |
| Burlington, KY | 18,203 | 54 | 8.0% |
| Somerset, MA | 18,160 | 44 | 12.0% |
| Pecan Grove, TX | 18,204 | 52 | 4.0% |
| Nipomo, CA | 18,182 | 46 | 8.0% |
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