| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 44°F | 29°F | 3.5" |
| February | 20°F | 46°F | 32°F | 3.4" |
| March | 24°F | 50°F | 36°F | 2.7" |
| April | 28°F | 56°F | 41°F | 1.6" |
| May | 33°F | 64°F | 48°F | 1.5" |
| June | 39°F | 74°F | 57°F | 0.6" |
| July | 44°F | 83°F | 64°F | 0.3" |
| August | 42°F | 81°F | 62°F | 0.5" |
| September | 37°F | 75°F | 56°F | 0.4" |
| October | 31°F | 64°F | 45°F | 2.1" |
| November | 25°F | 53°F | 37°F | 1.9" |
| December | 19°F | 45°F | 31°F | 3.7" |
| Index | Volcano | California | National |
| Air quality index | 39 | 55 | 42 |
| Pollution index | 1,641,280 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 331 |
| Days with moderate air quality | 33 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.090% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Pine Grove, CA | 2,070 | 39 | 22.0% |
| Red Corral, CA | 1,557 | 39 | 22.0% |
| Mountain Ranch, CA | 318 | 39 | 22.0% |
| Mokelumne Hill, CA | 484 | 39 | 22.0% |
| Pioneer, CA | 1,224 | 39 | 22.0% |
| Volcano, CA | 45 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Libertyville, AL | 45 | 31 | 38.0% |
| Hensley, AR | 45 | 45 | 10.0% |
| Anderson, IA | 45 | 40 | 20.0% |
| Balltown, IA | 45 | 29 | 42.0% |
| Hamer, ID | 45 | 27 | 46.0% |
| Volcano, CA | 45 | 39 | 22.0% |
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