| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 38°F | 28°F | 3.3" |
| February | 18°F | 40°F | 29°F | 3.6" |
| March | 26°F | 50°F | 38°F | 3.6" |
| April | 37°F | 65°F | 50°F | 4.0" |
| May | 47°F | 75°F | 60°F | 4.0" |
| June | 57°F | 82°F | 69°F | 5.5" |
| July | 63°F | 88°F | 75°F | 4.9" |
| August | 60°F | 86°F | 72°F | 4.9" |
| September | 54°F | 80°F | 66°F | 3.9" |
| October | 43°F | 67°F | 54°F | 5.9" |
| November | 32°F | 55°F | 43°F | 3.2" |
| December | 24°F | 44°F | 33°F | 4.5" |
| Index | North Granby | Connecticut | National |
| Air quality index | 40 | 43 | 50 |
| Pollution index | 7,859,360 | 7,127,531 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Winsted, CT | 7,535 | 37 | 26% |
| Torrington, CT | 35,227 | 37 | 26% |
| Collinsville, CT | 3,693 | 37 | 26% |
| New Hartford Center, CT | 1,409 | 37 | 26% |
| Thompsonville, CT | 8,873 | 40 | 20% |
| North Granby, CT | 1,471 | 40 | 20% |
| City, State | Population | Air Quality Index | National Avg. |
| Jonesboro, IN | 1,471 | 35 | 30% |
| Tubac, AZ | 1,471 | 31 | 38% |
| Cementon, PA | 1,471 | 42 | 16% |
| Sugar City, ID | 1,471 | 43 | 14% |
| Duncannon, PA | 1,472 | 44 | 12% |
| North Granby, CT | 1,471 | 40 | 20% |
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