| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 38°F | 28°F | 1.3" |
| February | 26°F | 43°F | 34°F | 1.7" |
| March | 28°F | 49°F | 39°F | 1.7" |
| April | 34°F | 58°F | 46°F | 2.3" |
| May | 40°F | 66°F | 54°F | 2.9" |
| June | 48°F | 77°F | 64°F | 3.7" |
| July | 55°F | 89°F | 73°F | 2.0" |
| August | 51°F | 85°F | 68°F | 2.8" |
| September | 44°F | 77°F | 60°F | 2.6" |
| October | 36°F | 58°F | 46°F | 2.2" |
| November | 28°F | 48°F | 37°F | 1.9" |
| December | 20°F | 36°F | 28°F | 1.0" |
| Index | Malta | 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. |
| Albion, ID | 422 | 20 | 60.0% |
| Declo, ID | 471 | 20 | 60.0% |
| Malta, ID | 360 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Kipnuk, AK | 360 | 31 | 38.0% |
| Muir Beach, CA | 360 | 40 | 20.0% |
| Fisher Island, FL | 360 | 41 | 18.0% |
| Worthington, IA | 360 | 29 | 42.0% |
| Protection, KS | 360 | 15 | 70.0% |
| Malta, ID | 360 | 20 | 60.0% |
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