| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 37°F | 27°F | 2.8" |
| February | 18°F | 39°F | 28°F | 3.3" |
| March | 26°F | 47°F | 36°F | 4.0" |
| April | 38°F | 62°F | 49°F | 3.9" |
| May | 48°F | 72°F | 59°F | 4.0" |
| June | 57°F | 80°F | 68°F | 5.0" |
| July | 63°F | 86°F | 74°F | 4.0" |
| August | 61°F | 83°F | 72°F | 3.6" |
| September | 54°F | 77°F | 65°F | 3.7" |
| October | 43°F | 65°F | 53°F | 5.8" |
| November | 32°F | 53°F | 42°F | 3.2" |
| December | 23°F | 42°F | 32°F | 4.0" |
| Index | Fitchburg | Massachusetts | National |
| Air quality index | 40 | 40 | 42 |
| Pollution index | 6,602,810 | 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 | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.060% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Jaffrey, NH | 2,852 | 34 | 32.0% |
| Baldwinville, MA | 2,181 | 34 | 32.0% |
| Winchendon, MA | 4,851 | 34 | 32.0% |
| Townsend, MA | 1,311 | 37 | 26.0% |
| East Pepperell, MA | 1,981 | 37 | 26.0% |
| Fitchburg, MA | 41,913 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Oviedo, FL | 41,897 | 37 | 26.0% |
| Buffalo Grove, IL | 41,884 | 55 | 10.0% |
| Covington, KY | 41,847 | 54 | 8.0% |
| Lancaster, OH | 41,994 | 46 | 8.0% |
| Wilkes-Barre, PA | 41,994 | 38 | 24.0% |
| Fitchburg, MA | 41,913 | 40 | 20.0% |
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