| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 40°F | 32°F | 8.1" |
| February | 21°F | 38°F | 28°F | 4.5" |
| March | 34°F | 55°F | 44°F | 5.9" |
| April | 42°F | 66°F | 54°F | 6.5" |
| May | 53°F | 77°F | 65°F | 3.5" |
| June | 64°F | 84°F | 74°F | 5.1" |
| July | 65°F | 85°F | 75°F | 6.3" |
| August | 68°F | 88°F | 77°F | 5.9" |
| September | 59°F | 81°F | 70°F | 9.0" |
| October | 49°F | 68°F | 58°F | 4.9" |
| November | 35°F | 54°F | 44°F | 5.0" |
| December | 25°F | 38°F | 31°F | 4.6" |
| Index | New Ross | Indiana | National |
| Air quality index | 42 | 56 | 42 |
| Pollution index | 1,601,640 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 276 |
| Days with moderate air quality | 89 |
| 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 | 0.002% |
| Lead | 0.040% |
| Mercury | 0.290% |
| City | Population | Air Quality Index | National Avg. |
| Thorntown, IN | 1,077 | 42 | 16.0% |
| Ladoga, IN | 1,274 | 42 | 16.0% |
| Lake Holiday, IN | 1,376 | 42 | 16.0% |
| Crawfordsville, IN | 16,088 | 42 | 16.0% |
| New Market, IN | 639 | 42 | 16.0% |
| New Ross, IN | 516 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Mountain Pine, AR | 516 | 38 | 24.0% |
| Olney Springs, CO | 516 | 20 | 60.0% |
| Georgetown CDP, IL | 516 | 42 | 16.0% |
| South Williamson, KY | 516 | 42 | 16.0% |
| Tionesta, PA | 516 | 9 | 82.0% |
| New Ross, IN | 516 | 42 | 16.0% |
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