| 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 | Spackenkill | New York | National |
| Air quality index | 36 | 43 | 42 |
| Pollution index | 9,612,350 | 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 | 0.030% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.230% |
| Mercury | 0.080% |
| City | Population | Air Quality Index | National Avg. |
| Marlboro, NY | 3,720 | 36 | 28.0% |
| Orange Lake, NY | 9,800 | 36 | 28.0% |
| Haviland, NY | 3,148 | 36 | 28.0% |
| Millbrook, NY | 1,342 | 36 | 28.0% |
| Poughkeepsie, NY | 30,341 | 36 | 28.0% |
| Spackenkill, NY | 4,090 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Walthourville, GA | 4,090 | 39 | 22.0% |
| Saint-Jacques, QC | 4,090 | n/a | |
| Whiteman AFB, MO | 4,092 | 47 | 6.0% |
| Northern Rockies, BC | 4,092 | n/a | |
| De Motte, IN | 4,093 | 37 | 26.0% |
| Spackenkill, NY | 4,090 | 36 | 28.0% |
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