| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 36°F | 27°F | 5.4" |
| February | 16°F | 38°F | 27°F | 5.5" |
| March | 26°F | 48°F | 37°F | 6.7" |
| April | 36°F | 62°F | 49°F | 5.7" |
| May | 46°F | 73°F | 60°F | 6.3" |
| June | 55°F | 79°F | 67°F | 7.6" |
| July | 61°F | 85°F | 73°F | 7.3" |
| August | 58°F | 83°F | 71°F | 8.2" |
| September | 51°F | 77°F | 64°F | 7.9" |
| October | 41°F | 65°F | 52°F | 8.1" |
| November | 30°F | 53°F | 41°F | 5.8" |
| December | 23°F | 41°F | 32°F | 6.5" |
| Index | Belchertown | Massachusetts | National |
| Air quality index | 40 | 40 | 42 |
| Pollution index | 7,859,360 | 8,399,610 | 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. |
| Fiskdale, MA | 3,015 | 40 | 20.0% |
| Holyoke, MA | 40,161 | 40 | 20.0% |
| Monson Center, MA | 1,688 | 40 | 20.0% |
| Amherst Center, MA | 20,037 | 40 | 20.0% |
| South Amherst, MA | 5,283 | 40 | 20.0% |
| Belchertown, MA | 3,037 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| River Bend, NC | 3,036 | 42 | 16.0% |
| South Pittsburg, TN | 3,038 | 46 | 8.0% |
| Leesburg, GA | 3,035 | 40 | 20.0% |
| Pittsfield, ME | 3,035 | 31 | 38.0% |
| Mars Hill, NC | 3,035 | 44 | 12.0% |
| Belchertown, MA | 3,037 | 40 | 20.0% |
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