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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 46°F | 35°F | 5.5" |
| February | 29°F | 51°F | 38°F | 6.1" |
| March | 32°F | 55°F | 42°F | 6.5" |
| April | 35°F | 62°F | 47°F | 3.2" |
| May | 41°F | 72°F | 55°F | 1.7" |
| June | 47°F | 80°F | 63°F | 1.4" |
| July | 52°F | 89°F | 71°F | 0.2" |
| August | 50°F | 88°F | 69°F | 0.1" |
| September | 44°F | 81°F | 61°F | 0.6" |
| October | 38°F | 67°F | 50°F | 2.8" |
| November | 32°F | 53°F | 41°F | 3.6" |
| December | 27°F | 45°F | 35°F | 6.7" |
| Index | McArthur | California | National |
| Air quality index | 42 | 55 | 42 |
| Pollution index | 661,452 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 311 |
| Days with moderate air quality | 53 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Lookout, CA | 50 | 29 | 42.0% |
| Cassel, CA | 266 | 42 | 16.0% |
| Little Valley, CA | 19 | 42 | 16.0% |
| Fall River Mills, CA | 387 | 42 | 16.0% |
| Hat Creek, CA | 91 | 42 | 16.0% |
| McArthur, CA | 521 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Hampton, FL | 521 | 35 | 30.0% |
| Seymour, IA | 521 | 39 | 22.0% |
| Golf, IL | 521 | 55 | 10.0% |
| Sun, LA | 521 | 30 | 40.0% |
| Cousins Island, ME | 521 | 40 | 20.0% |
| McArthur, CA | 521 | 42 | 16.0% |
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