| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 38°F | 29°F | 6.3" |
| February | 20°F | 38°F | 29°F | 6.1" |
| March | 28°F | 47°F | 37°F | 8.2" |
| April | 39°F | 59°F | 48°F | 7.7" |
| May | 48°F | 69°F | 58°F | 6.4" |
| June | 56°F | 76°F | 65°F | 7.2" |
| July | 63°F | 82°F | 72°F | 10.6" |
| August | 60°F | 80°F | 69°F | 9.0" |
| September | 54°F | 73°F | 63°F | 8.3" |
| October | 44°F | 63°F | 53°F | 7.9" |
| November | 35°F | 52°F | 43°F | 8.0" |
| December | 27°F | 42°F | 34°F | 7.8" |
| Index | Hopedale | Massachusetts | National |
| Air quality index | 40 | 40 | 42 |
| Pollution index | 14,818,200 | 8,399,610 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 312 |
| Days with moderate air quality | 52 |
| 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. |
| Hopkinton, MA | 2,794 | 40 | 20.0% |
| Milford, MA | 25,701 | 40 | 20.0% |
| Westborough, MA | 4,057 | 40 | 20.0% |
| Upton, MA | 2,998 | 40 | 20.0% |
| Cordaville, MA | 2,847 | 40 | 20.0% |
| Hopedale, MA | 3,812 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Plainwell, MI | 3,812 | 39 | 22.0% |
| Dundas, NB | 3,812 | n/a | |
| Kutztown University, PA | 3,811 | 42 | 16.0% |
| Warwick, ON | 3,811 | n/a | |
| Roosevelt Park, MI | 3,813 | 38 | 24.0% |
| Hopedale, MA | 3,812 | 40 | 20.0% |
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