| 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 | Jamestown | Indiana | National |
| Air quality index | 54 | 56 | 42 |
| Pollution index | 1,601,640 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 148 |
| Days with moderate air quality | 212 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| 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% |
| New Ross, IN | 516 | 42 | 16.0% |
| Ladoga, IN | 1,274 | 42 | 16.0% |
| Crawfordsville, IN | 16,088 | 42 | 16.0% |
| Darlington, IN | 884 | 42 | 16.0% |
| Jamestown, IN | 1,092 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Gun Club Estates, FL | 1,092 | 36 | 28.0% |
| Mendon, IL | 1,092 | 41 | 18.0% |
| Silver City, NC | 1,092 | 41 | 18.0% |
| Poquott, NY | 1,092 | 43 | 14.0% |
| Joseph, OR | 1,092 | 20 | 60.0% |
| Jamestown, IN | 1,092 | 54 | 8.0% |
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