| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 31°F | 21°F | 4.3" |
| February | 11°F | 32°F | 21°F | 3.9" |
| March | 18°F | 41°F | 29°F | 5.3" |
| April | 32°F | 56°F | 44°F | 7.2" |
| May | 41°F | 68°F | 54°F | 4.5" |
| June | 55°F | 79°F | 66°F | 5.1" |
| July | 58°F | 81°F | 69°F | 5.2" |
| August | 56°F | 81°F | 68°F | 2.4" |
| September | 49°F | 76°F | 61°F | 3.2" |
| October | 42°F | 62°F | 51°F | 10.5" |
| November | 27°F | 46°F | 36°F | 7.6" |
| December | 16°F | 33°F | 24°F | 4.4" |
| Index | Claremont | New Hampshire | National |
| Air quality index | 34 | 34 | 42 |
| Pollution index | 1,843,420 | 3,959,618 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 328 |
| Days with moderate air quality | 37 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Charlestown, NH | 933 | 34 | 32.0% |
| Ascutney, VT | 380 | 34 | 32.0% |
| North Hartland, VT | 274 | 34 | 32.0% |
| Windsor, VT | 2,042 | 34 | 32.0% |
| Blodgett Landing, NH | 88 | 34 | 32.0% |
| Claremont, NH | 12,969 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Lynnfield, MA | 12,968 | 43 | 14.0% |
| Greenwich, CT | 12,967 | 43 | 14.0% |
| Forest Hill, TX | 12,964 | 51 | 2.0% |
| El Sobrante CDP (Contra Costa County), CA | 12,963 | 89 | 78.0% |
| El Dorado, KS | 12,976 | 40 | 20.0% |
| Claremont, NH | 12,969 | 34 | 32.0% |
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