| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 34°F | 25°F | 3.1" |
| February | 18°F | 36°F | 27°F | 2.2" |
| March | 28°F | 50°F | 38°F | 2.7" |
| April | 38°F | 64°F | 50°F | 3.6" |
| May | 48°F | 74°F | 61°F | 4.2" |
| June | 58°F | 83°F | 70°F | 4.2" |
| July | 62°F | 85°F | 73°F | 4.5" |
| August | 60°F | 83°F | 72°F | 4.9" |
| September | 53°F | 78°F | 65°F | 4.0" |
| October | 43°F | 65°F | 53°F | 4.5" |
| November | 32°F | 52°F | 41°F | 2.6" |
| December | 22°F | 38°F | 30°F | 2.8" |
| Index | Osceola | Indiana | National |
| Air quality index | 37 | 56 | 42 |
| Pollution index | 4,961,970 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 294 |
| Days with moderate air quality | 71 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Dunlap, IN | 7,273 | 37 | 26.0% |
| Simonton Lake, IN | 5,081 | 37 | 26.0% |
| Elkhart, IN | 52,657 | 37 | 26.0% |
| New Paris, IN | 1,464 | 37 | 26.0% |
| Goshen, IN | 34,586 | 37 | 26.0% |
| Osceola, IN | 3,323 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Keego Harbor, MI | 3,323 | 56 | 12.0% |
| Adelaide-Metcalfe, ON | 3,322 | n/a | |
| Manor, PA | 3,324 | 56 | 12.0% |
| Malartic, QC | 3,324 | n/a | |
| Auberry, CA | 3,321 | 60 | 20.0% |
| Osceola, IN | 3,323 | 37 | 26.0% |
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