| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 37°F | 27°F | 4.4" |
| February | 16°F | 35°F | 26°F | 3.3" |
| March | 23°F | 45°F | 34°F | 5.1" |
| April | 36°F | 61°F | 48°F | 10.7" |
| May | 44°F | 71°F | 58°F | 2.8" |
| June | 57°F | 83°F | 70°F | 4.1" |
| July | 61°F | 85°F | 73°F | 5.5" |
| August | 61°F | 85°F | 72°F | 4.5" |
| September | 53°F | 80°F | 66°F | 1.2" |
| October | 46°F | 67°F | 55°F | 15.1" |
| November | 30°F | 52°F | 41°F | 5.8" |
| December | 20°F | 37°F | 29°F | 4.9" |
| Index | Walden | 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% |
| Pine Bush, NY | 1,682 | 36 | 28.0% |
| Mountain Lodge Park, NY | 2,824 | 36 | 28.0% |
| Napanoch, NY | 1,045 | 36 | 28.0% |
| Hyde Park, NY | 1,988 | 36 | 28.0% |
| Walden, NY | 6,683 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| West Loch Estate, HI | 6,685 | 30 | 40.0% |
| Cherry Hills Village, CO | 6,680 | 58 | 16.0% |
| Kula, HI | 6,687 | 15 | 70.0% |
| Eldridge, IA | 6,678 | 46 | 8.0% |
| Barrington, NJ | 6,678 | 51 | 2.0% |
| Walden, NY | 6,683 | 36 | 28.0% |
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