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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 25°F | 16°F | 0.4" |
| February | 10°F | 28°F | 18°F | 0.5" |
| March | 25°F | 44°F | 33°F | 1.4" |
| April | 36°F | 60°F | 46°F | 3.1" |
| May | 47°F | 72°F | 59°F | 4.2" |
| June | 58°F | 81°F | 69°F | 4.7" |
| July | 61°F | 84°F | 72°F | 2.7" |
| August | 59°F | 80°F | 69°F | 4.0" |
| September | 50°F | 75°F | 62°F | 2.9" |
| October | 38°F | 61°F | 49°F | 3.1" |
| November | 25°F | 46°F | 35°F | 1.0" |
| December | 12°F | 29°F | 20°F | 0.8" |
| Index | Terril | Iowa | National |
| Air quality index | 32 | 39 | 42 |
| Pollution index | 1,563,560 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 327 |
| Days with moderate air quality | 35 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Estherville, IA | 5,729 | 15 | 70.0% |
| Ruthven, IA | 771 | 15 | 70.0% |
| Gruver, IA | 56 | 15 | 70.0% |
| Wallingford, IA | 220 | 15 | 70.0% |
| Emmetsburg, IA | 3,706 | 15 | 70.0% |
| Terril, IA | 343 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Friendship, MD | 343 | 47 | 6.0% |
| Boyne Falls, MI | 343 | 36 | 28.0% |
| Leonard, MI | 343 | 38 | 24.0% |
| Remer, MN | 343 | 29 | 42.0% |
| Rushmore, MN | 343 | 36 | 28.0% |
| Terril, IA | 343 | 32 | 36.0% |
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