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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 36°F | 27°F | 1.5" |
| February | 26°F | 44°F | 34°F | 1.3" |
| March | 32°F | 56°F | 43°F | 2.0" |
| April | 35°F | 62°F | 47°F | 3.9" |
| May | 44°F | 72°F | 57°F | 5.5" |
| June | 49°F | 80°F | 63°F | 1.4" |
| July | 60°F | 94°F | 77°F | 1.0" |
| August | 57°F | 90°F | 73°F | 1.2" |
| September | 46°F | 78°F | 61°F | 1.6" |
| October | 38°F | 64°F | 49°F | 2.8" |
| November | 27°F | 51°F | 38°F | 1.2" |
| December | 20°F | 37°F | 28°F | 3.0" |
| Index | Twin Falls | Idaho | National |
| Air quality index | 20 | 32 | 42 |
| Pollution index | 3,377,370 | 2,063,710 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 361 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Filer, ID | 2,845 | 20 | 60.0% |
| Kimberly, ID | 3,977 | 20 | 60.0% |
| Hansen, ID | 1,327 | 20 | 60.0% |
| Wendell, ID | 2,736 | 20 | 60.0% |
| Buhl, ID | 4,462 | 20 | 60.0% |
| Twin Falls, ID | 49,819 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Little Elm, TX | 49,792 | 51 | 2.0% |
| Kannapolis, NC | 49,788 | 40 | 20.0% |
| Poway, CA | 49,780 | 64 | 28.0% |
| Rowland Heights, CA | 49,914 | 89 | 78.0% |
| North Bethesda, MD | 49,719 | 47 | 6.0% |
| Twin Falls, ID | 49,819 | 20 | 60.0% |
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