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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 36°F | 27°F | 1.1" |
| February | 26°F | 47°F | 36°F | 0.7" |
| March | 33°F | 58°F | 44°F | 1.2" |
| April | 37°F | 66°F | 51°F | 0.7" |
| May | 45°F | 76°F | 60°F | 1.2" |
| June | 53°F | 86°F | 69°F | 0.7" |
| July | 61°F | 97°F | 79°F | 0.1" |
| August | 57°F | 93°F | 75°F | 0.2" |
| September | 48°F | 83°F | 64°F | 0.4" |
| October | 38°F | 67°F | 51°F | 0.8" |
| November | 29°F | 50°F | 38°F | 1.1" |
| December | 20°F | 37°F | 28°F | 1.8" |
| Index | New Plymouth | 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. |
| Parma, ID | 1,990 | 36 | 28.0% |
| Payette, ID | 7,655 | 36 | 28.0% |
| Nyssa, OR | 3,176 | 36 | 28.0% |
| Fruitland, ID | 5,390 | 36 | 28.0% |
| Ontario, OR | 11,031 | 36 | 28.0% |
| New Plymouth, ID | 1,641 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| North Vacherie, LA | 1,641 | 41 | 18.0% |
| Perryopolis, PA | 1,641 | 56 | 12.0% |
| Whitmire, SC | 1,641 | 44 | 12.0% |
| Freeman, SD | 1,641 | 36 | 28.0% |
| Hawkins, TX | 1,641 | 36 | 28.0% |
| New Plymouth, ID | 1,641 | 36 | 28.0% |
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