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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 39°F | 30°F | 1.3" |
| February | 28°F | 48°F | 37°F | 0.9" |
| March | 34°F | 58°F | 45°F | 1.5" |
| April | 37°F | 65°F | 51°F | 1.2" |
| May | 45°F | 75°F | 60°F | 1.2" |
| June | 53°F | 85°F | 69°F | 0.8" |
| July | 62°F | 97°F | 79°F | 0.2" |
| August | 60°F | 93°F | 77°F | 0.3" |
| September | 52°F | 83°F | 67°F | 0.5" |
| October | 41°F | 68°F | 53°F | 1.0" |
| November | 32°F | 52°F | 41°F | 1.3" |
| December | 23°F | 39°F | 31°F | 1.9" |
| Index | Meridian | 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. |
| Middleton, ID | 8,005 | 36 | 28.0% |
| Eagle, ID | 28,145 | 36 | 28.0% |
| Nampa, ID | 96,825 | 36 | 28.0% |
| Garden City, ID | 11,873 | 36 | 28.0% |
| Caldwell, ID | 56,734 | 36 | 28.0% |
| Meridian, ID | 107,787 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Lewisville, TX | 107,740 | 51 | 2.0% |
| Waterbury, CT | 107,841 | 41 | 18.0% |
| Red Deer, AB | 107,873 | n/a | |
| Hillsboro, OR | 108,026 | 38 | 24.0% |
| Greeley, CO | 107,445 | 45 | 10.0% |
| Meridian, ID | 107,787 | 36 | 28.0% |
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