| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 56°F | 46°F | n/a |
| February | 41°F | 60°F | 50°F | n/a |
| March | 45°F | 64°F | 54°F | n/a |
| April | 48°F | 71°F | 59°F | n/a |
| May | 55°F | 80°F | 67°F | n/a |
| June | 63°F | 89°F | 76°F | n/a |
| July | 67°F | 94°F | 81°F | n/a |
| August | 66°F | 93°F | 79°F | n/a |
| September | 61°F | 89°F | 75°F | n/a |
| October | 53°F | 76°F | 64°F | n/a |
| November | 43°F | 61°F | 52°F | n/a |
| December | 38°F | 54°F | 46°F | n/a |
| Index | Lake Almanor West | California | National |
| Air quality index | 46 | 55 | 42 |
| Pollution index | 1,799,830 | 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 | 0.010% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Chester, CA | 2,088 | 46 | 8.0% |
| Clear Creek, CA | 293 | 46 | 8.0% |
| Lake Almanor Country Club, CA | 429 | 46 | 8.0% |
| Twain, CA | 303 | 46 | 8.0% |
| Greenville, CA | 785 | 46 | 8.0% |
| Lake Almanor West, CA | 329 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Maysville, AR | 329 | 44 | 12.0% |
| Russellville, IN | 329 | 45 | 10.0% |
| Grainfield, KS | 329 | 15 | 70.0% |
| Clarence, LA | 329 | 30 | 40.0% |
| Askov, MN | 329 | 35 | 30.0% |
| Lake Almanor West, CA | 329 | 46 | 8.0% |
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