| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 37°F | 28°F | 5.1" |
| February | 17°F | 36°F | 26°F | 3.8" |
| March | 23°F | 45°F | 34°F | 6.5" |
| April | 36°F | 60°F | 47°F | 11.5" |
| May | 45°F | 69°F | 57°F | 3.6" |
| June | 57°F | 81°F | 68°F | 3.5" |
| July | 62°F | 83°F | 72°F | 3.9" |
| August | 60°F | 84°F | 72°F | 2.8" |
| September | 52°F | 79°F | 65°F | 4.3" |
| October | 46°F | 66°F | 55°F | 10.9" |
| November | 31°F | 53°F | 42°F | 5.4" |
| December | 21°F | 38°F | 29°F | 5.4" |
| Index | Stafford Springs | Connecticut | National |
| Air quality index | 40 | 43 | 42 |
| Pollution index | 7,859,360 | 8,629,883 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 305 |
| Days with moderate air quality | 59 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.320% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Mansfield Center, CT | 1,367 | 33 | 34.0% |
| South Coventry, CT | 1,413 | 33 | 34.0% |
| Coventry Lake, CT | 2,135 | 33 | 34.0% |
| Storrs, CT | 16,392 | 33 | 34.0% |
| Sherwood Manor, CT | 5,901 | 40 | 20.0% |
| Stafford Springs, CT | 4,784 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Central Frontenac, ON | 4,783 | n/a | |
| Farmington, ME | 4,785 | 28 | 44.0% |
| Nelsonville, OH | 4,785 | 25 | 50.0% |
| Gates, NY | 4,782 | 37 | 26.0% |
| East Merrimack, NH | 4,786 | 37 | 26.0% |
| Stafford Springs, CT | 4,784 | 40 | 20.0% |
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