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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 57°F | 38°F | 1.9" |
| February | 25°F | 62°F | 43°F | 0.7" |
| March | 30°F | 69°F | 50°F | 0.4" |
| April | 35°F | 75°F | 56°F | 0.3" |
| May | 43°F | 84°F | 65°F | 0.3" |
| June | 51°F | 95°F | 75°F | 0.4" |
| July | 57°F | 100°F | 81°F | 0.2" |
| August | 53°F | 98°F | 78°F | 0.1" |
| September | 46°F | 90°F | 70°F | 0.1" |
| October | 37°F | 78°F | 57°F | 0.5" |
| November | 27°F | 67°F | 45°F | 0.1" |
| December | 21°F | 56°F | 37°F | 1.0" |
| Index | Round Valley | California | National |
| Air quality index | 47 | 55 | 42 |
| Pollution index | 117,012 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 232 |
| Days with moderate air quality | 121 |
| Days w/ poor A.Q. for sensitive groups | 6 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Chalfant, CA | 1,010 | 47 | 6.0% |
| Mesa, CA | 434 | 47 | 6.0% |
| Wilkerson, CA | 495 | 47 | 6.0% |
| Crowley Lake, CA | 1,145 | 47 | 6.0% |
| Sunny Slopes, CA | 68 | 47 | 6.0% |
| Round Valley, CA | 493 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Gustavus, AK | 493 | 20 | 60.0% |
| Clarkedale, AR | 493 | 45 | 10.0% |
| Micanopy, FL | 493 | 35 | 30.0% |
| Keyesport, IL | 493 | 43 | 14.0% |
| Woodson, IL | 493 | 40 | 20.0% |
| Round Valley, CA | 493 | 47 | 6.0% |
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