| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 62°F | 45°F | 6.1" |
| February | 37°F | 66°F | 50°F | 3.1" |
| March | 46°F | 76°F | 59°F | 5.4" |
| April | 55°F | 83°F | 68°F | 6.5" |
| May | 61°F | 88°F | 74°F | 0.5" |
| June | 70°F | 94°F | 82°F | n/a |
| July | 71°F | 95°F | 82°F | n/a |
| August | 71°F | 96°F | 83°F | n/a |
| September | 65°F | 90°F | 76°F | 1.4" |
| October | 53°F | 81°F | 66°F | 3.3" |
| November | 44°F | 69°F | 55°F | 1.0" |
| December | 35°F | 62°F | 46°F | 2.1" |
| Index | Iraan | Texas | National |
| Air quality index | 28 | 52 | 42 |
| Pollution index | 1,695,390 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 354 |
| Days with good air quality | 319 |
| 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 | 0.030% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Iraan, TX | 1,252 | 28 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Kotlik, AK | 1,252 | 31 | 38.0% |
| Weissport East, PA | 1,252 | 42 | 16.0% |
| Green Valley, SD | 1,252 | 44 | 12.0% |
| Shullsburg, WI | 1,252 | 29 | 42.0% |
| Georgetown, CT | 1,251 | 43 | 14.0% |
| Iraan, TX | 1,252 | 28 | 44.0% |
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