| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 28°F | 18°F | 2.9" |
| February | 10°F | 29°F | 19°F | 2.5" |
| March | 18°F | 39°F | 28°F | 3.3" |
| April | 31°F | 54°F | 42°F | 4.7" |
| May | 43°F | 66°F | 54°F | 4.5" |
| June | 52°F | 75°F | 63°F | 6.0" |
| July | 58°F | 81°F | 69°F | 4.0" |
| August | 56°F | 79°F | 67°F | 4.4" |
| September | 49°F | 72°F | 60°F | 3.8" |
| October | 39°F | 58°F | 48°F | 6.7" |
| November | 28°F | 45°F | 36°F | 4.7" |
| December | 16°F | 32°F | 24°F | 4.3" |
| Index | Howland | Maine | National |
| Air quality index | 31 | 33 | 42 |
| Pollution index | 3,063,530 | 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 | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Lincoln, ME | 2,606 | 31 | 38.0% |
| Milo, ME | 1,932 | 31 | 38.0% |
| Howland, ME | 1,052 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Gosport, IN | 1,052 | 42 | 16.0% |
| Mortons Gap, KY | 1,052 | 43 | 14.0% |
| Ama, LA | 1,052 | 45 | 10.0% |
| Derma, MS | 1,052 | 33 | 34.0% |
| Cane Savannah, SC | 1,052 | 43 | 14.0% |
| Howland, ME | 1,052 | 31 | 38.0% |
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