| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 28°F | 19°F | 1.2" |
| February | 15°F | 34°F | 24°F | 0.7" |
| March | 25°F | 47°F | 35°F | 1.1" |
| April | 31°F | 58°F | 43°F | 1.6" |
| May | 38°F | 68°F | 52°F | 1.6" |
| June | 46°F | 78°F | 61°F | 1.3" |
| July | 51°F | 88°F | 69°F | 0.5" |
| August | 49°F | 86°F | 67°F | 0.8" |
| September | 42°F | 76°F | 57°F | 1.2" |
| October | 33°F | 59°F | 45°F | 1.5" |
| November | 24°F | 44°F | 33°F | 0.9" |
| December | 13°F | 30°F | 21°F | 1.3" |
| Index | Spencer | Idaho | National |
| Air quality index | 43 | 32 | 42 |
| Pollution index | 1,965,480 | 2,063,710 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 326 |
| Days with moderate air quality | 39 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Dubois, ID | 619 | 43 | 14.0% |
| Spencer, ID | 13 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Lime Village, AK | 13 | 31 | 38.0% |
| Drytown, CA | 13 | 52 | 4.0% |
| Beaconsfield, IA | 13 | 39 | 22.0% |
| Meyer, IA | 13 | 15 | 70.0% |
| Balfour, ND | 13 | 36 | 28.0% |
| Spencer, ID | 13 | 43 | 14.0% |
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