| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 36°F | 28°F | 5.3" |
| February | 22°F | 37°F | 29°F | 4.2" |
| March | 34°F | 52°F | 42°F | 4.8" |
| April | 43°F | 64°F | 53°F | 7.7" |
| May | 54°F | 75°F | 64°F | 8.1" |
| June | 63°F | 83°F | 72°F | 9.2" |
| July | 65°F | 85°F | 74°F | 7.6" |
| August | 62°F | 83°F | 72°F | 7.4" |
| September | 56°F | 78°F | 66°F | 8.2" |
| October | 46°F | 66°F | 55°F | 4.3" |
| November | 35°F | 53°F | 43°F | 5.5" |
| December | 26°F | 40°F | 33°F | 4.3" |
| Index | Amboy | Indiana | National |
| Air quality index | 37 | 56 | 42 |
| Pollution index | 1,806,400 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 351 |
| Days with good air quality | 319 |
| Days with moderate air quality | 32 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.100% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Fairmount, IN | 2,671 | 35 | 30.0% |
| Galveston, IN | 1,349 | 37 | 26.0% |
| Jalapa, IN | 143 | 37 | 26.0% |
| Onward, IN | 171 | 37 | 26.0% |
| Mexico, IN | 1,283 | 37 | 26.0% |
| Amboy, IN | 363 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Hydaburg, AK | 363 | 20 | 60.0% |
| East Point, AL | 363 | 41 | 18.0% |
| Glen Allen, AL | 363 | 35 | 30.0% |
| Red Level, AL | 363 | 31 | 38.0% |
| Kit Carson, CO | 363 | 20 | 60.0% |
| Amboy, IN | 363 | 37 | 26.0% |
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