| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 28°F | 18°F | 2.3" |
| February | 10°F | 30°F | 20°F | 2.2" |
| March | 20°F | 40°F | 30°F | 2.1" |
| April | 33°F | 56°F | 44°F | 3.1" |
| May | 45°F | 69°F | 57°F | 3.2" |
| June | 53°F | 75°F | 64°F | 3.8" |
| July | 58°F | 81°F | 69°F | 3.4" |
| August | 56°F | 79°F | 67°F | 4.3" |
| September | 49°F | 73°F | 60°F | 2.7" |
| October | 40°F | 60°F | 49°F | 4.1" |
| November | 28°F | 47°F | 37°F | 2.0" |
| December | 16°F | 33°F | 25°F | 3.1" |
| Index | Heuvelton | New York | National |
| Air quality index | 35 | 43 | 42 |
| Pollution index | 1,088,560 | 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 | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.260% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Madrid, NY | 805 | 0 | 100.0% |
| Canton, NY | 6,486 | 0 | 100.0% |
| Hammond, NY | 254 | 35 | 30.0% |
| Ogdensburg, NY | 10,559 | 35 | 30.0% |
| Richville, NY | 277 | 35 | 30.0% |
| Heuvelton, NY | 659 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Gila Crossing, AZ | 659 | 74 | 48.0% |
| Colbert, GA | 659 | 44 | 12.0% |
| Van Bibber Lake, IN | 659 | 45 | 10.0% |
| Parker School, MT | 659 | 21 | 58.0% |
| Arcola, SK | 659 | n/a | |
| Heuvelton, NY | 659 | 35 | 30.0% |
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