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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 26°F | 3.2" |
| February | 18°F | 36°F | 27°F | 3.5" |
| March | 25°F | 44°F | 34°F | 3.5" |
| April | 37°F | 58°F | 47°F | 4.2" |
| May | 48°F | 69°F | 58°F | 3.9" |
| June | 55°F | 76°F | 65°F | 5.6" |
| July | 63°F | 82°F | 72°F | 3.4" |
| August | 61°F | 79°F | 69°F | 5.3" |
| September | 55°F | 73°F | 63°F | 4.1" |
| October | 44°F | 62°F | 52°F | 5.7" |
| November | 33°F | 50°F | 41°F | 3.4" |
| December | 25°F | 40°F | 32°F | 4.8" |
| Index | Webster | Massachusetts | National |
| Air quality index | 40 | 40 | 42 |
| Pollution index | 14,818,200 | 8,399,610 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 312 |
| Days with moderate air quality | 52 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.150% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.130% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| South Woodstock, CT | 1,031 | 33 | 34.0% |
| Putnam, CT | 7,138 | 33 | 34.0% |
| East Douglas, MA | 2,985 | 40 | 20.0% |
| Upton, MA | 2,279 | 40 | 20.0% |
| Spencer, MA | 5,810 | 40 | 20.0% |
| Webster, MA | 11,719 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Florham Park, NJ | 11,719 | 51 | 2.0% |
| Wanaque, NJ | 11,719 | 51 | 2.0% |
| Grafton, WI | 11,718 | 44 | 12.0% |
| Stratford, PE | 11,716 | n/a | |
| Arlington, TN | 11,715 | 45 | 10.0% |
| Webster, MA | 11,719 | 40 | 20.0% |
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