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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 45°F | 38°F | 9.1" |
| February | 35°F | 50°F | 41°F | 4.8" |
| March | 37°F | 54°F | 45°F | 7.6" |
| April | 41°F | 60°F | 49°F | 4.4" |
| May | 47°F | 68°F | 56°F | 3.5" |
| June | 51°F | 72°F | 61°F | 2.2" |
| July | 55°F | 79°F | 66°F | 1.0" |
| August | 55°F | 79°F | 66°F | 1.5" |
| September | 50°F | 72°F | 59°F | 3.9" |
| October | 44°F | 61°F | 51°F | 6.4" |
| November | 37°F | 50°F | 43°F | 9.5" |
| December | 32°F | 43°F | 37°F | 7.3" |
| Index | Nooksack | Washington | National |
| Air quality index | 34 | 36 | 42 |
| Pollution index | 480,925 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 277 |
| Days with moderate air quality | 78 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bellingham, WA | 90,821 | 34 | 32.0% |
| Custer, WA | 298 | 34 | 32.0% |
| Sudden Valley, WA | 7,407 | 34 | 32.0% |
| Maple Falls, WA | 226 | 34 | 32.0% |
| Ferndale, WA | 14,591 | 34 | 32.0% |
| Nooksack, WA | 1,594 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Benld, IL | 1,594 | 54 | 8.0% |
| Whitewright, TX | 1,594 | 325 | 550.0% |
| Kettle Falls, WA | 1,594 | 43 | 14.0% |
| Homer, GA | 1,595 | 37 | 26.0% |
| Twin City, GA | 1,595 | 47 | 6.0% |
| Nooksack, WA | 1,594 | 34 | 32.0% |
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