| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 36°F | 27°F | 1.1" |
| February | 26°F | 47°F | 36°F | 0.7" |
| March | 33°F | 58°F | 44°F | 1.2" |
| April | 37°F | 66°F | 51°F | 0.7" |
| May | 45°F | 76°F | 60°F | 1.2" |
| June | 53°F | 86°F | 69°F | 0.7" |
| July | 61°F | 97°F | 79°F | 0.1" |
| August | 57°F | 93°F | 75°F | 0.2" |
| September | 48°F | 83°F | 64°F | 0.4" |
| October | 38°F | 67°F | 51°F | 0.8" |
| November | 29°F | 50°F | 38°F | 1.1" |
| December | 20°F | 37°F | 28°F | 1.8" |
| Index | Midvale | Idaho | National |
| Air quality index | 36 | 32 | 42 |
| Pollution index | 1,647,310 | 2,063,710 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 293 |
| Days with moderate air quality | 60 |
| Days w/ poor A.Q. for sensitive groups | 9 |
| Days with unhealthy air quality | 3 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Cambridge, ID | 228 | 36 | 28.0% |
| Weiser, ID | 5,358 | 36 | 28.0% |
| Midvale, ID | 248 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Trinity Village, CA | 248 | 27 | 46.0% |
| Vernon, CA | 248 | 72 | 44.0% |
| Bartow, GA | 248 | 47 | 6.0% |
| Girard, GA | 248 | 47 | 6.0% |
| Harpers Ferry, IA | 248 | 35 | 30.0% |
| Midvale, ID | 248 | 36 | 28.0% |
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