| 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 | Westwood | 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. |
| Almanor, CA | 0 | 46 | 8.0% |
| Hamilton Branch, CA | 446 | 46 | 8.0% |
| Prattville, CA | 27 | 46 | 8.0% |
| Canyondam, CA | 0 | 46 | 8.0% |
| Lake Almanor Country Club, CA | 429 | 46 | 8.0% |
| Westwood, CA | 1,387 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Ferndale, CA | 1,387 | 27 | 46.0% |
| New Windsor, MD | 1,387 | 42 | 16.0% |
| Spencer, TN | 1,387 | 25 | 50.0% |
| Elroy, WI | 1,387 | 35 | 30.0% |
| Powerview-Pine Falls, MB | 1,387 | n/a | |
| Westwood, CA | 1,387 | 46 | 8.0% |
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