| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 58°F | 47°F | 3.5" |
| February | 42°F | 62°F | 51°F | 3.9" |
| March | 45°F | 67°F | 56°F | 3.7" |
| April | 48°F | 74°F | 60°F | 2.1" |
| May | 55°F | 84°F | 69°F | 0.7" |
| June | 61°F | 92°F | 76°F | 0.3" |
| July | 65°F | 98°F | 81°F | 0.0" |
| August | 63°F | 95°F | 79°F | 0.0" |
| September | 59°F | 90°F | 74°F | 0.2" |
| October | 51°F | 79°F | 64°F | 1.2" |
| November | 44°F | 65°F | 54°F | 2.6" |
| December | 38°F | 57°F | 47°F | 4.1" |
| Index | Cohasset | California | National |
| Air quality index | 46 | 55 | 42 |
| Pollution index | 1,812,230 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 224 |
| Days with moderate air quality | 136 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.020% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Concow, CA | 472 | 46 | 8.0% |
| Stirling City, CA | 300 | 46 | 8.0% |
| Hamilton City, CA | 2,446 | 46 | 8.0% |
| Forest Ranch, CA | 1,551 | 46 | 8.0% |
| Paradise, CA | 17,560 | 46 | 8.0% |
| Cohasset, CA | 497 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Angoon, AK | 497 | 20 | 60.0% |
| Bird City, KS | 497 | 19 | 62.0% |
| Secretary, MD | 497 | 41 | 18.0% |
| Ghent, MN | 497 | 32 | 36.0% |
| New Houlka, MS | 497 | 39 | 22.0% |
| Cohasset, CA | 497 | 46 | 8.0% |
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