| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 34°F | 22°F | 4.8" |
| February | 9°F | 34°F | 21°F | 4.5" |
| March | 19°F | 43°F | 30°F | 8.0" |
| April | 33°F | 55°F | 43°F | 16.6" |
| May | 42°F | 65°F | 52°F | 9.1" |
| June | 54°F | 79°F | 65°F | 6.2" |
| July | 58°F | 82°F | 68°F | 8.2" |
| August | 56°F | 84°F | 68°F | 14.0" |
| September | 49°F | 76°F | 62°F | 6.3" |
| October | 42°F | 62°F | 51°F | 9.5" |
| November | 29°F | 50°F | 38°F | 8.6" |
| December | 14°F | 36°F | 25°F | 5.2" |
| Index | West Kennebunk | Maine | National |
| Air quality index | 40 | 33 | 42 |
| Pollution index | 91,790 | 3,417,521 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 308 |
| Days with moderate air quality | 56 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Berwick, ME | 1,985 | 27 | 46.0% |
| Alfred, ME | 997 | 40 | 20.0% |
| North Berwick, ME | 1,716 | 40 | 20.0% |
| Scarborough, ME | 5,268 | 40 | 20.0% |
| Biddeford, ME | 21,502 | 40 | 20.0% |
| West Kennebunk, ME | 1,154 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Spring Valley CDP (Lake County), CA | 1,154 | 64 | 28.0% |
| Astoria, IL | 1,154 | 40 | 20.0% |
| Hatfield, MA | 1,154 | 40 | 20.0% |
| Urbancrest, OH | 1,154 | 46 | 8.0% |
| Richlandtown, PA | 1,154 | 42 | 16.0% |
| West Kennebunk, ME | 1,154 | 40 | 20.0% |
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