| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 36°F | 27°F | 1.0" |
| February | 24°F | 43°F | 33°F | 0.6" |
| March | 29°F | 54°F | 41°F | 1.0" |
| April | 34°F | 61°F | 46°F | 1.2" |
| May | 40°F | 70°F | 55°F | 1.8" |
| June | 48°F | 80°F | 63°F | 0.8" |
| July | 54°F | 90°F | 72°F | 0.3" |
| August | 52°F | 87°F | 69°F | 0.5" |
| September | 44°F | 78°F | 60°F | 0.9" |
| October | 35°F | 64°F | 48°F | 1.1" |
| November | 27°F | 51°F | 37°F | 0.9" |
| December | 20°F | 37°F | 28°F | 1.1" |
| Index | Declo | Idaho | National |
| Air quality index | 20 | 32 | 42 |
| Pollution index | 2,556,040 | 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 | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Malta, ID | 360 | 20 | 60.0% |
| Albion, ID | 422 | 20 | 60.0% |
| Paul, ID | 1,543 | 20 | 60.0% |
| Burley, ID | 10,476 | 20 | 60.0% |
| Rupert, ID | 5,820 | 20 | 60.0% |
| Declo, ID | 471 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Ashley, IL | 471 | 43 | 14.0% |
| Fowler, KS | 471 | 15 | 70.0% |
| Sedalia, NC | 471 | 31 | 38.0% |
| Forman, ND | 471 | 20 | 60.0% |
| Beallsville, PA | 471 | 56 | 12.0% |
| Declo, ID | 471 | 20 | 60.0% |
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