| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 34°F | 24°F | 2.7" |
| February | 14°F | 36°F | 25°F | 2.8" |
| March | 23°F | 45°F | 33°F | 3.3" |
| April | 34°F | 60°F | 47°F | 3.5" |
| May | 45°F | 71°F | 57°F | 3.4" |
| June | 54°F | 78°F | 66°F | 5.5" |
| July | 60°F | 84°F | 71°F | 4.1" |
| August | 57°F | 81°F | 69°F | 4.3" |
| September | 50°F | 75°F | 62°F | 4.1" |
| October | 40°F | 62°F | 50°F | 6.2" |
| November | 29°F | 50°F | 39°F | 3.0" |
| December | 21°F | 40°F | 30°F | 4.2" |
| Index | Northfield | Massachusetts | National |
| Air quality index | 34 | 40 | 42 |
| Pollution index | 6,602,810 | 8,399,610 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 348 |
| Days with moderate air quality | 17 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.060% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Millers Falls, MA | 1,158 | 34 | 32.0% |
| Marlborough, NH | 1,093 | 34 | 32.0% |
| Brattleboro, VT | 6,429 | 34 | 32.0% |
| Athol, MA | 8,323 | 34 | 32.0% |
| Orange, MA | 3,882 | 34 | 32.0% |
| Northfield, MA | 970 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Klamath, CA | 970 | 20 | 60.0% |
| Oaktown, IN | 970 | 36 | 28.0% |
| Spearville, KS | 970 | 15 | 70.0% |
| Lakes of the North, MI | 970 | 36 | 28.0% |
| Copan, OK | 970 | 45 | 10.0% |
| Northfield, MA | 970 | 34 | 32.0% |
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