| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 43°F | 36°F | 5.3" |
| February | 33°F | 49°F | 40°F | 4.4" |
| March | 35°F | 53°F | 44°F | 6.1" |
| April | 38°F | 59°F | 48°F | 3.3" |
| May | 44°F | 68°F | 55°F | 2.6" |
| June | 48°F | 72°F | 60°F | 1.8" |
| July | 51°F | 77°F | 63°F | 0.9" |
| August | 51°F | 78°F | 64°F | 1.2" |
| September | 46°F | 71°F | 58°F | 2.7" |
| October | 41°F | 59°F | 50°F | 5.7" |
| November | 35°F | 50°F | 42°F | 6.5" |
| December | 30°F | 44°F | 36°F | 6.5" |
| Index | Point Roberts | 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. |
| Birch Bay, WA | 9,917 | 34 | 32.0% |
| Blaine, WA | 5,427 | 34 | 32.0% |
| Point Roberts, WA | 1,100 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Strawberry, AZ | 1,100 | 60 | 20.0% |
| Knightsen, CA | 1,100 | 45 | 10.0% |
| Tabor, IA | 1,100 | 40 | 20.0% |
| Dunlap, IL | 1,100 | 41 | 18.0% |
| West Marion, NC | 1,100 | 44 | 12.0% |
| Point Roberts, WA | 1,100 | 34 | 32.0% |
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