| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 32°F | 22°F | 2.1" |
| February | 12°F | 35°F | 23°F | 2.5" |
| March | 21°F | 44°F | 32°F | 2.7" |
| April | 33°F | 60°F | 46°F | 3.2" |
| May | 44°F | 71°F | 57°F | 4.0" |
| June | 53°F | 79°F | 65°F | 5.0" |
| July | 58°F | 84°F | 70°F | 5.4" |
| August | 56°F | 82°F | 68°F | 4.1" |
| September | 50°F | 75°F | 61°F | 3.4" |
| October | 39°F | 62°F | 49°F | 5.5" |
| November | 28°F | 49°F | 38°F | 2.8" |
| December | 19°F | 37°F | 28°F | 3.3" |
| Index | Canaan | New Hampshire | National |
| Air quality index | 34 | 34 | 42 |
| Pollution index | 5,847,470 | 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 | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.180% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Plainfield, NH | 265 | 34 | 32.0% |
| Wilder, VT | 3,146 | 34 | 32.0% |
| Enfield, NH | 2,059 | 34 | 32.0% |
| Fairlee, VT | 163 | 34 | 32.0% |
| Hanover, NH | 8,744 | 34 | 32.0% |
| Canaan, NH | 264 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Industry, CA | 264 | 72 | 44.0% |
| Crystal Lake, IA | 264 | 15 | 70.0% |
| Bliss, ID | 264 | 20 | 60.0% |
| Sweetwater, ID | 264 | 29 | 42.0% |
| Fenton, LA | 264 | 45 | 10.0% |
| Canaan, NH | 264 | 34 | 32.0% |
Here are the best places to live in New Hampshire
These are the 10 most affordable cities in New Hampshire
10 Best cities in New Hampshire for employment
Top 10 cities in New Hampshire with the best education system