| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 45°F | 34°F | 3.8" |
| February | 26°F | 48°F | 36°F | 3.1" |
| March | 36°F | 60°F | 48°F | 4.7" |
| April | 45°F | 72°F | 59°F | 5.9" |
| May | 55°F | 79°F | 67°F | 4.9" |
| June | 64°F | 88°F | 76°F | 4.3" |
| July | 67°F | 90°F | 78°F | 5.2" |
| August | 66°F | 90°F | 77°F | 3.2" |
| September | 58°F | 84°F | 70°F | 4.2" |
| October | 46°F | 73°F | 59°F | 3.9" |
| November | 35°F | 60°F | 47°F | 4.1" |
| December | 29°F | 48°F | 38°F | 4.8" |
| Index | Somerville | Indiana | National |
| Air quality index | 45 | 56 | 42 |
| Pollution index | 4,793,970 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 244 |
| Days with moderate air quality | 111 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.310% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.120% |
| Mercury | 0.140% |
| City | Population | Air Quality Index | National Avg. |
| Petersburg, IN | 2,315 | 1 | 98.0% |
| Winslow, IN | 900 | 6 | 88.0% |
| Spurgeon, IN | 123 | 6 | 88.0% |
| Oakland City, IN | 2,570 | 6 | 88.0% |
| Francisco, IN | 541 | 36 | 28.0% |
| Somerville, IN | 354 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Rock City, IL | 354 | 42 | 16.0% |
| Everest, KS | 354 | 43 | 14.0% |
| Greeley, KS | 354 | 41 | 18.0% |
| Uniontown, KS | 354 | 37 | 26.0% |
| Otterville, MO | 354 | 38 | 24.0% |
| Somerville, IN | 354 | 45 | 10.0% |
Here are the best places to live in Indiana
Safest States In The US
Check out the 10 most dangerous cities in Indiana
See the best places to live in Somerville