| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 26°F | 2.0" |
| February | 28°F | 48°F | 37°F | 1.2" |
| March | 36°F | 58°F | 45°F | 7.3" |
| April | 45°F | 66°F | 54°F | 7.1" |
| May | 53°F | 75°F | 63°F | 8.1" |
| June | 65°F | 87°F | 76°F | 8.2" |
| July | 67°F | 87°F | 76°F | 6.8" |
| August | 63°F | 83°F | 72°F | 7.2" |
| September | 60°F | 82°F | 70°F | 7.1" |
| October | 46°F | 69°F | 57°F | 6.0" |
| November | 35°F | 56°F | 45°F | 2.4" |
| December | 23°F | 40°F | 30°F | 6.3" |
| Index | Thurman | Iowa | National |
| Air quality index | 40 | 39 | 42 |
| Pollution index | 747,023 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 283 |
| Days with moderate air quality | 82 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.050% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Dunbar, NE | 229 | 31 | 38.0% |
| Sidney, IA | 1,007 | 40 | 20.0% |
| Tabor, IA | 1,100 | 40 | 20.0% |
| Hamburg, IA | 1,300 | 40 | 20.0% |
| Hastings, IA | 154 | 40 | 20.0% |
| Thurman, IA | 172 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Ethelsville, AL | 172 | 35 | 30.0% |
| Spring Garden, AL | 172 | 43 | 14.0% |
| Greenway, AR | 172 | 26 | 48.0% |
| East Nicolaus, CA | 172 | 44 | 12.0% |
| Honcut, CA | 172 | 44 | 12.0% |
| Thurman, IA | 172 | 40 | 20.0% |
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