| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 65°F | 50°F | 8.5" |
| February | 44°F | 65°F | 53°F | 3.7" |
| March | 46°F | 69°F | 55°F | 4.4" |
| April | 44°F | 70°F | 55°F | 2.3" |
| May | 49°F | 73°F | 59°F | 3.9" |
| June | 50°F | 75°F | 60°F | 0.4" |
| July | 54°F | 78°F | 63°F | 0.0" |
| August | 54°F | 79°F | 63°F | 0.4" |
| September | 52°F | 77°F | 62°F | 0.1" |
| October | 50°F | 77°F | 60°F | 1.9" |
| November | 46°F | 75°F | 57°F | 1.6" |
| December | 41°F | 66°F | 52°F | 6.4" |
| Index | Arroyo Grande | 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% |
| Guadalupe, CA | 7,654 | 46 | 8.0% |
| Oceano, CA | 7,601 | 46 | 8.0% |
| Woodlands, CA | 2,331 | 46 | 8.0% |
| Edna, CA | 408 | 46 | 8.0% |
| Arroyo Grande, CA | 17,924 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Beltsville, MD | 17,922 | 47 | 6.0% |
| Cary, IL | 17,926 | 55 | 10.0% |
| Sainte-Sophie, QC | 17,917 | n/a | |
| Sheridan, WY | 17,938 | 39 | 22.0% |
| Lenoir, NC | 17,909 | 43 | 14.0% |
| Arroyo Grande, CA | 17,924 | 46 | 8.0% |
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