| 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 | 50 |
| Pollution index | 2,556,040 | 2,232,285 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Heyburn, ID | 3,187 | 20 | 60% |
| Acequia, ID | 201 | 20 | 60% |
| Malta, ID | 252 | 20 | 60% |
| Albion, ID | 315 | 20 | 60% |
| Paul, ID | 1,367 | 20 | 60% |
| Declo, ID | 510 | 20 | 60% |
| City, State | Population | Air Quality Index | National Avg. |
| Dyckesville, WI | 510 | 36 | 28% |
| Franklintown, PA | 510 | 44 | 12% |
| Corwin, OH | 510 | 43 | 14% |
| Glorieta, NM | 510 | 44 | 12% |
| Moran, KS | 510 | 22 | 56% |
| Declo, ID | 510 | 20 | 60% |
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