| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 32°F | 24°F | 2.7" |
| February | 16°F | 34°F | 24°F | 2.5" |
| March | 23°F | 44°F | 33°F | 3.3" |
| April | 35°F | 59°F | 46°F | 4.0" |
| May | 46°F | 69°F | 57°F | 3.7" |
| June | 55°F | 77°F | 65°F | 5.5" |
| July | 59°F | 81°F | 70°F | 4.5" |
| August | 58°F | 79°F | 67°F | 5.3" |
| September | 51°F | 73°F | 61°F | 3.9" |
| October | 41°F | 61°F | 50°F | 5.0" |
| November | 31°F | 49°F | 39°F | 3.2" |
| December | 22°F | 37°F | 29°F | 3.3" |
| Index | Guilford | 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. |
| New Berlin, NY | 968 | 27 | 46.0% |
| Morris, NY | 643 | 27 | 46.0% |
| Gilbertsville, NY | 298 | 27 | 46.0% |
| Sidney, NY | 3,668 | 27 | 46.0% |
| Norwich, NY | 6,629 | 27 | 46.0% |
| Guilford, NY | 204 | 27 | 46.0% |
| City | Population | Air Quality Index | National Avg. |
| Perla, AR | 204 | 38 | 24.0% |
| Bear Valley, CA | 204 | 48 | 4.0% |
| Bloomington, ID | 204 | 44 | 12.0% |
| Eldred, IL | 204 | 54 | 8.0% |
| Indianola, IL | 204 | 42 | 16.0% |
| Guilford, NY | 204 | 27 | 46.0% |
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