| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 44°F | 30°F | 1.1" |
| February | 22°F | 49°F | 34°F | 1.1" |
| March | 26°F | 55°F | 39°F | 1.2" |
| April | 29°F | 61°F | 44°F | 1.5" |
| May | 35°F | 70°F | 53°F | 1.2" |
| June | 42°F | 81°F | 62°F | 0.7" |
| July | 47°F | 91°F | 71°F | 0.2" |
| August | 44°F | 89°F | 68°F | 0.2" |
| September | 37°F | 82°F | 60°F | 0.3" |
| October | 30°F | 67°F | 47°F | 1.0" |
| November | 25°F | 53°F | 37°F | 1.1" |
| December | 18°F | 42°F | 29°F | 1.5" |
| Index | Alturas | California | National |
| Air quality index | 29 | 55 | 42 |
| Pollution index | 661,452 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 261 |
| Days with moderate air quality | 98 |
| Days w/ poor A.Q. for sensitive groups | 6 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| California Pines, CA | 367 | 29 | 42.0% |
| Daphnedale Park, CA | 145 | 29 | 42.0% |
| Alturas, CA | 2,550 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Bayfield, CO | 2,550 | 44 | 12.0% |
| Sabetha, KS | 2,550 | 43 | 14.0% |
| Nicoma Park, OK | 2,550 | 48 | 4.0% |
| Marysville, PA | 2,550 | 44 | 12.0% |
| Vassar, MI | 2,549 | 26 | 48.0% |
| Alturas, CA | 2,550 | 29 | 42.0% |
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