| 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 | Maxwell | California | National |
| Air quality index | 44 | 55 | 42 |
| Pollution index | 2,024,690 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 239 |
| Days with moderate air quality | 124 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Colusa, CA | 6,111 | 44 | 12.0% |
| Williams, CA | 5,284 | 44 | 12.0% |
| Princeton, CA | 337 | 46 | 8.0% |
| Maxwell, CA | 1,256 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Farmersburg, IN | 1,256 | 45 | 10.0% |
| Barbourmeade, KY | 1,256 | 49 | 2.0% |
| Velva, ND | 1,256 | 36 | 28.0% |
| Benton, TN | 1,256 | 1 | 98.0% |
| Las Palmas II, TX | 1,256 | 44 | 12.0% |
| Maxwell, CA | 1,256 | 44 | 12.0% |
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