| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 68°F | 53°F | 3.9" |
| February | 43°F | 67°F | 54°F | 2.6" |
| March | 45°F | 69°F | 55°F | 2.2" |
| April | 47°F | 71°F | 57°F | 1.4" |
| May | 49°F | 73°F | 59°F | 0.3" |
| June | 52°F | 77°F | 62°F | 0.1" |
| July | 55°F | 79°F | 64°F | 0.1" |
| August | 56°F | 80°F | 64°F | 0.0" |
| September | 55°F | 82°F | 65°F | 0.0" |
| October | 52°F | 80°F | 63°F | 0.9" |
| November | 46°F | 73°F | 57°F | 1.1" |
| December | 41°F | 66°F | 52°F | 3.1" |
| Index | San Luis Obispo | 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% |
| Morro Bay, CA | 10,592 | 46 | 8.0% |
| Los Ranchos, CA | 1,675 | 46 | 8.0% |
| Arroyo Grande, CA | 17,924 | 46 | 8.0% |
| Cayucos, CA | 2,228 | 46 | 8.0% |
| San Luis Obispo, CA | 47,402 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Ocoee, FL | 47,433 | 39 | 22.0% |
| East Providence, RI | 47,442 | 44 | 12.0% |
| Beavercreek, OH | 47,343 | 47 | 6.0% |
| Charleston, WV | 47,273 | 40 | 20.0% |
| Woodstock, ON | 47,584 | n/a | |
| San Luis Obispo, CA | 47,402 | 46 | 8.0% |
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