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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 20°F | 39°F | 29°F | 2.7" | 
| February | 20°F | 40°F | 30°F | 2.9" | 
| March | 28°F | 49°F | 38°F | 3.1" | 
| April | 39°F | 63°F | 50°F | 3.6" | 
| May | 48°F | 73°F | 60°F | 3.5" | 
| June | 57°F | 80°F | 68°F | 5.1" | 
| July | 64°F | 86°F | 74°F | 4.1" | 
| August | 61°F | 83°F | 72°F | 4.2" | 
| September | 54°F | 78°F | 65°F | 3.2" | 
| October | 43°F | 66°F | 54°F | 4.1" | 
| November | 33°F | 55°F | 43°F | 3.2" | 
| December | 26°F | 44°F | 35°F | 4.0" | 
| Index | Deep River Center | Connecticut | National | 
| Air quality index | 41 | 43 | 42 | 
| Pollution index | 4,117,250 | 8,629,883 | 2,726,193 | 
| Measurement | Total | 
| Days measured | 365 | 
| Days with good air quality | 280 | 
| Days with moderate air quality | 71 | 
| Days w/ poor A.Q. for sensitive groups | 12 | 
| Days with unhealthy air quality | 2 | 
| Pollutant | Total | 
| Arsenic | 0.010% | 
| Benzene | 0.050% | 
| Carbon Tetrachloride | 0.010% | 
| Lead | 0.010% | 
| Mercury | 0.010% | 
| City | Population | Air Quality Index | National Avg. | 
| Colchester, CT | 5,147 | 33 | 34.0% | 
| Chester Center, CT | 1,731 | 37 | 26.0% | 
| Essex Village, CT | 2,757 | 37 | 26.0% | 
| Fenwick, CT | 44 | 37 | 26.0% | 
| Old Saybrook Center, CT | 1,984 | 37 | 26.0% | 
| Deep River Center, CT | 2,638 | 41 | 18.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Sutter Creek, CA | 2,638 | 39 | 22.0% | 
| Thunderbolt, GA | 2,638 | 39 | 22.0% | 
| St. Paul, NE | 2,638 | 19 | 62.0% | 
| Perry, ON | 2,638 | n/a | |
| Farm Loop, AK | 2,637 | 31 | 38.0% | 
| Deep River Center, CT | 2,638 | 41 | 18.0% |