| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 40°F | 30°F | 5.5" |
| February | 26°F | 49°F | 36°F | 1.4" |
| March | 33°F | 61°F | 46°F | 0.7" |
| April | 39°F | 66°F | 51°F | 1.0" |
| May | 47°F | 76°F | 60°F | 4.5" |
| June | 51°F | 83°F | 66°F | 5.0" |
| July | 59°F | 96°F | 78°F | 0.8" |
| August | 54°F | 93°F | 73°F | 1.1" |
| September | 45°F | 79°F | 61°F | 4.0" |
| October | 39°F | 66°F | 50°F | 5.4" |
| November | 29°F | 48°F | 37°F | 1.3" |
| December | 24°F | 38°F | 30°F | 6.7" |
| Index | Melba | Idaho | National |
| Air quality index | 36 | 32 | 42 |
| Pollution index | 9,401,360 | 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 | 0.060% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.090% |
| Lead | 0.070% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Marsing, ID | 1,379 | 36 | 28.0% |
| Murphy, ID | 190 | 36 | 28.0% |
| Nampa, ID | 96,825 | 36 | 28.0% |
| Kuna, ID | 20,985 | 36 | 28.0% |
| Melba, ID | 658 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Ona, FL | 658 | 36 | 28.0% |
| Marengo, IN | 658 | 6 | 88.0% |
| Russell, MA | 658 | 40 | 20.0% |
| Marshall, NC | 658 | 44 | 12.0% |
| Lyons, OH | 658 | 39 | 22.0% |
| Melba, ID | 658 | 36 | 28.0% |
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