| 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. |
| South Deerfield, MA | 2,150 | 40 | 20.0% |
| Palmer Town, MA | 12,236 | 40 | 20.0% |
| Ware, MA | 5,978 | 40 | 20.0% |
| Springfield, MA | 153,677 | 40 | 20.0% |
| Hatfield, MA | 1,154 | 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% |
Here are the best places to live in Massachusetts
Check out the 10 safest cities in Massachusetts
Check out the 10 most dangerous cities in Massachusetts
These are the 10 cheapest cities in Massachusetts