| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 26°F | 2.4" |
| February | 15°F | 32°F | 23°F | 1.6" |
| March | 25°F | 44°F | 34°F | 3.0" |
| April | 35°F | 57°F | 45°F | 6.7" |
| May | 44°F | 69°F | 56°F | 1.3" |
| June | 60°F | 82°F | 70°F | 4.1" |
| July | 60°F | 80°F | 70°F | 0.0" |
| August | 62°F | 83°F | 72°F | 9.5" |
| September | 56°F | 77°F | 65°F | 3.8" |
| October | 46°F | 64°F | 55°F | 3.1" |
| November | 33°F | 50°F | 41°F | 4.0" |
| December | 22°F | 35°F | 29°F | 0.0" |
| Index | Dundee | New York | National |
| Air quality index | 34 | 43 | 42 |
| Pollution index | 2,885,140 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 358 |
| Days with moderate air quality | 7 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Penn Yan, NY | 5,072 | 34 | 32.0% |
| Interlaken, NY | 576 | 34 | 32.0% |
| Odessa, NY | 542 | 34 | 32.0% |
| Dresden, NY | 314 | 34 | 32.0% |
| Burdett, NY | 469 | 34 | 32.0% |
| Dundee, NY | 2,077 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Riverside, AL | 2,077 | 38 | 24.0% |
| Alorton, IL | 2,077 | 54 | 8.0% |
| Fredonia, KS | 2,077 | 22 | 56.0% |
| Benavides, TX | 2,077 | 30 | 40.0% |
| La Plata, NM | 2,078 | 49 | 2.0% |
| Dundee, NY | 2,077 | 34 | 32.0% |
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