| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 63°F | 47°F | 2.7" |
| February | 38°F | 65°F | 50°F | 1.9" |
| March | 40°F | 71°F | 53°F | 1.5" |
| April | 41°F | 76°F | 57°F | 0.8" |
| May | 46°F | 83°F | 62°F | 0.3" |
| June | 50°F | 91°F | 69°F | 0.0" |
| July | 55°F | 95°F | 72°F | 0.3" |
| August | 54°F | 95°F | 71°F | 0.0" |
| September | 51°F | 92°F | 68°F | 0.0" |
| October | 45°F | 82°F | 61°F | 0.5" |
| November | 38°F | 71°F | 53°F | 0.7" |
| December | 34°F | 62°F | 46°F | 1.7" |
| Index | El Paso de Robles (Paso Robles) | 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. |
| Creston, CA | 31 | 46 | 8.0% |
| Atascadero, CA | 30,444 | 46 | 8.0% |
| Templeton, CA | 7,965 | 46 | 8.0% |
| Cayucos, CA | 2,228 | 46 | 8.0% |
| Whitley Gardens, CA | 44 | 46 | 8.0% |
| El Paso de Robles (Paso Robles), CA | 31,480 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Saint-Constant, QC | 31,461 | n/a | |
| Aiken, SC | 31,428 | 47 | 6.0% |
| Fairbanks, AK | 31,427 | 38 | 24.0% |
| Midlothian, TX | 31,533 | 51 | 2.0% |
| Franklin Square, NY | 31,537 | 51 | 2.0% |
| El Paso de Robles (Paso Robles), CA | 31,480 | 46 | 8.0% |
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