| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 31°F | 21°F | 2.4" |
| February | 10°F | 32°F | 21°F | 2.2" |
| March | 19°F | 41°F | 30°F | 2.4" |
| April | 32°F | 55°F | 43°F | 3.3" |
| May | 44°F | 68°F | 55°F | 4.0" |
| June | 52°F | 75°F | 63°F | 4.8" |
| July | 58°F | 82°F | 70°F | 2.7" |
| August | 57°F | 81°F | 68°F | 3.7" |
| September | 50°F | 74°F | 61°F | 3.9" |
| October | 40°F | 61°F | 50°F | 5.5" |
| November | 28°F | 48°F | 38°F | 3.1" |
| December | 17°F | 35°F | 26°F | 4.1" |
| Index | Searsport | Maine | National |
| Air quality index | 31 | 33 | 42 |
| Pollution index | 1,854,040 | 3,417,521 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 348 |
| Days with moderate air quality | 13 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Winterport, ME | 1,450 | 31 | 38.0% |
| Bucksport, ME | 2,879 | 31 | 38.0% |
| Castine, ME | 813 | 36 | 28.0% |
| Belfast, ME | 6,710 | 36 | 28.0% |
| Searsport, ME | 1,039 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Tahoma, CA | 1,039 | 44 | 12.0% |
| Manassa, CO | 1,039 | 15 | 70.0% |
| New Richland, MN | 1,039 | 36 | 28.0% |
| Grande-Vallée, QC | 1,039 | n/a | |
| Saint-Cyprien, QC | 1,039 | n/a | |
| Searsport, ME | 1,039 | 31 | 38.0% |
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