| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 32°F | 24°F | 4.9" |
| February | 17°F | 33°F | 25°F | 4.4" |
| March | 26°F | 45°F | 34°F | 5.3" |
| April | 36°F | 58°F | 46°F | 6.9" |
| May | 47°F | 69°F | 57°F | 5.6" |
| June | 55°F | 76°F | 65°F | 9.2" |
| July | 60°F | 81°F | 70°F | 8.2" |
| August | 57°F | 78°F | 67°F | 8.7" |
| September | 52°F | 72°F | 61°F | 7.4" |
| October | 42°F | 60°F | 50°F | 6.6" |
| November | 31°F | 48°F | 39°F | 4.7" |
| December | 24°F | 37°F | 30°F | 6.3" |
| Index | Delhi | New York | National |
| Air quality index | 27 | 43 | 42 |
| Pollution index | 1,643,670 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 349 |
| Days with moderate air quality | 10 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Otego, NY | 887 | 27 | 46.0% |
| West End, NY | 2,199 | 27 | 46.0% |
| Bloomville, NY | 218 | 27 | 46.0% |
| Davenport Center, NY | 263 | 27 | 46.0% |
| Franklin, NY | 376 | 27 | 46.0% |
| Delhi, NY | 3,146 | 27 | 46.0% |
| City | Population | Air Quality Index | National Avg. |
| Wilder, VT | 3,146 | 34 | 32.0% |
| Mont-Saint-Grégoire, QC | 3,146 | n/a | |
| Hillsburg-Roblin-Shell River, MB | 3,146 | n/a | |
| Nevada City, CA | 3,145 | 44 | 12.0% |
| Walbridge, OH | 3,145 | 40 | 20.0% |
| Delhi, NY | 3,146 | 27 | 46.0% |
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