| 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 | Longmeadow | Massachusetts | National |
| Air quality index | 40 | 40 | 50 |
| Pollution index | 7,859,360 | 12,377,839 | 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. |
| Hazardville, CT | 4,986 | 40 | 20% |
| Southwood Acres, CT | 7,785 | 40 | 20% |
| Agawam Town, MA | 28,701 | 40 | 20% |
| Chicopee, MA | 56,100 | 40 | 20% |
| Wilbraham, MA | 3,916 | 40 | 20% |
| Longmeadow, MA | 15,837 | 40 | 20% |
| City, State | Population | Air Quality Index | National Avg. |
| La Palma, CA | 15,834 | 72 | 44% |
| Grandville, MI | 15,842 | 38 | 24% |
| New Territory, TX | 15,843 | 52 | 4% |
| Lebanon, IN | 15,846 | 54 | 8% |
| Manassas Park, VA | 15,827 | 47 | 6% |
| Longmeadow, MA | 15,837 | 40 | 20% |
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