| 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 | Homedale | Idaho | National |
| Air quality index | 36 | 32 | 42 |
| Pollution index | 1,647,310 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Caldwell, ID | 56,734 | 36 | 28.0% |
| Parma, ID | 1,990 | 36 | 28.0% |
| Greenleaf, ID | 1,123 | 36 | 28.0% |
| Wilder, ID | 1,740 | 36 | 28.0% |
| Marsing, ID | 1,379 | 36 | 28.0% |
| Homedale, ID | 2,688 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Bermuda Run, NC | 2,688 | 45 | 10.0% |
| Monticello, GA | 2,687 | 38 | 24.0% |
| Tobaccoville, NC | 2,687 | 45 | 10.0% |
| Aspinwall, PA | 2,687 | 56 | 12.0% |
| Cleveland, FL | 2,689 | 36 | 28.0% |
| Homedale, ID | 2,688 | 36 | 28.0% |
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