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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 32°F | 22°F | 2.6" |
| February | 11°F | 32°F | 22°F | 2.3" |
| March | 21°F | 42°F | 32°F | 2.0" |
| April | 34°F | 57°F | 45°F | 3.3" |
| May | 44°F | 69°F | 57°F | 3.1" |
| June | 54°F | 76°F | 65°F | 4.3" |
| July | 59°F | 81°F | 70°F | 3.2" |
| August | 58°F | 80°F | 69°F | 3.9" |
| September | 50°F | 73°F | 62°F | 3.5" |
| October | 41°F | 61°F | 51°F | 5.5" |
| November | 30°F | 50°F | 40°F | 3.2" |
| December | 20°F | 37°F | 29°F | 3.4" |
| Index | Watertown | New York | National |
| Air quality index | 35 | 43 | 42 |
| Pollution index | 230,538 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 205 |
| Days with good air quality | 198 |
| Days with moderate air quality | 7 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Brownville, NY | 874 | 35 | 30.0% |
| Dexter, NY | 790 | 35 | 30.0% |
| Herrings, NY | 132 | 35 | 30.0% |
| Chaumont, NY | 702 | 35 | 30.0% |
| Philadelphia, NY | 1,196 | 35 | 30.0% |
| Watertown, NY | 25,224 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Hazelwood, MO | 25,222 | 54 | 8.0% |
| Reading, MA | 25,236 | 43 | 14.0% |
| Lunenburg, NS | 25,205 | n/a | |
| Collingwood, ON | 25,244 | n/a | |
| Zanesville, OH | 25,246 | 41 | 18.0% |
| Watertown, NY | 25,224 | 35 | 30.0% |
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