| 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 | Santa Margarita | 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. |
| Atascadero, CA | 30,444 | 46 | 8.0% |
| Morro Bay, CA | 10,592 | 46 | 8.0% |
| San Luis Obispo, CA | 47,402 | 46 | 8.0% |
| Avila Beach, CA | 1,455 | 46 | 8.0% |
| Creston, CA | 31 | 46 | 8.0% |
| Santa Margarita, CA | 1,025 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Salamatof, AK | 1,025 | 31 | 38.0% |
| West Park, CA | 1,025 | 60 | 20.0% |
| Winthrop, IA | 1,025 | 39 | 22.0% |
| Montgomery, IN | 1,025 | 1 | 98.0% |
| Brush Fork, WV | 1,025 | 295 | 490.0% |
| Santa Margarita, CA | 1,025 | 46 | 8.0% |
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