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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 39°F | 29°F | 4.7" |
| February | 16°F | 38°F | 27°F | 4.6" |
| March | 24°F | 45°F | 35°F | 8.7" |
| April | 36°F | 59°F | 47°F | 9.5" |
| May | 44°F | 68°F | 56°F | 8.2" |
| June | 55°F | 80°F | 68°F | 4.3" |
| July | 60°F | 84°F | 72°F | 5.8" |
| August | 58°F | 84°F | 72°F | 2.1" |
| September | 50°F | 79°F | 64°F | 4.6" |
| October | 45°F | 66°F | 55°F | 10.6" |
| November | 30°F | 54°F | 42°F | 5.6" |
| December | 21°F | 40°F | 30°F | 6.0" |
| Index | Walpole | Massachusetts | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 14,818,200 | 8,399,610 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 291 |
| Days with moderate air quality | 73 |
| 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. |
| Milford, MA | 26,072 | 40 | 20.0% |
| Cordaville, MA | 2,884 | 40 | 20.0% |
| Framingham, MA | 72,846 | 40 | 20.0% |
| Hopkinton, MA | 3,864 | 40 | 20.0% |
| Brookline, MA | 59,223 | 43 | 14.0% |
| Walpole, MA | 6,211 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Crystal Lake, FL | 6,211 | 36 | 28.0% |
| Lindale, TX | 6,212 | 36 | 28.0% |
| Bridgeport, MI | 6,208 | 26 | 48.0% |
| Yardville, NJ | 6,208 | 41 | 18.0% |
| Humboldt, SK | 6,215 | n/a | |
| Walpole, MA | 6,211 | 43 | 14.0% |
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