| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 38°F | 28°F | 2.8" |
| February | 19°F | 40°F | 29°F | 2.7" |
| March | 27°F | 50°F | 38°F | 3.0" |
| April | 38°F | 64°F | 51°F | 3.4" |
| May | 48°F | 74°F | 61°F | 3.7" |
| June | 58°F | 81°F | 69°F | 4.7" |
| July | 63°F | 86°F | 74°F | 4.2" |
| August | 60°F | 84°F | 72°F | 5.6" |
| September | 53°F | 78°F | 65°F | 3.4" |
| October | 43°F | 66°F | 53°F | 4.4" |
| November | 32°F | 54°F | 43°F | 2.9" |
| December | 25°F | 43°F | 33°F | 4.0" |
| Index | Millbrook | New York | National |
| Air quality index | 36 | 43 | 42 |
| Pollution index | 161,427 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 319 |
| Days with moderate air quality | 46 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Port Ewen, NY | 3,334 | 36 | 28.0% |
| Hillside Lake, NY | 1,291 | 36 | 28.0% |
| Wappingers Falls, NY | 5,639 | 36 | 28.0% |
| Pleasant Valley, NY | 1,481 | 36 | 28.0% |
| Spackenkill, NY | 4,090 | 36 | 28.0% |
| Millbrook, NY | 1,342 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Albion, PA | 1,342 | 36 | 28.0% |
| Gray, TN | 1,342 | 45 | 10.0% |
| Mendon, UT | 1,342 | 44 | 12.0% |
| Kittitas, WA | 1,342 | 23 | 54.0% |
| Independence, WI | 1,342 | 15 | 70.0% |
| Millbrook, NY | 1,342 | 36 | 28.0% |
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