| 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 | Los Ranchos | 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. |
| Avila Beach, CA | 1,455 | 46 | 8.0% |
| Los Osos, CA | 16,174 | 46 | 8.0% |
| Los Berros, CA | 301 | 46 | 8.0% |
| San Luis Obispo, CA | 47,402 | 46 | 8.0% |
| Blacklake, CA | 797 | 46 | 8.0% |
| Los Ranchos, CA | 1,675 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Olivet, MI | 1,675 | 36 | 28.0% |
| Bruceville-Eddy, TX | 1,675 | 38 | 24.0% |
| Lake Isabella, MI | 1,676 | 36 | 28.0% |
| Gallatin, MO | 1,674 | 43 | 14.0% |
| Saint-Flavien, QC | 1,674 | n/a | |
| Los Ranchos, CA | 1,675 | 46 | 8.0% |
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