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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 44°F | 25°F | 0.3" |
| February | 12°F | 45°F | 27°F | 0.5" |
| March | 21°F | 58°F | 38°F | 0.7" |
| April | 29°F | 64°F | 45°F | 1.6" |
| May | 37°F | 72°F | 54°F | 2.3" |
| June | 48°F | 85°F | 66°F | 2.2" |
| July | 54°F | 90°F | 72°F | 2.2" |
| August | 52°F | 86°F | 69°F | 2.9" |
| September | 43°F | 80°F | 61°F | 1.2" |
| October | 31°F | 67°F | 47°F | 0.8" |
| November | 19°F | 55°F | 35°F | 0.3" |
| December | 9°F | 42°F | 24°F | 0.3" |
| Index | Simla | Colorado | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 563,976 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 259 |
| Days with moderate air quality | 106 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.030% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Calhan, CO | 463 | 45 | 10.0% |
| Ramah, CO | 164 | 45 | 10.0% |
| Simla, CO | 504 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Daisy, GA | 504 | 39 | 22.0% |
| Denmark, IA | 504 | 29 | 42.0% |
| Martensdale, IA | 504 | 39 | 22.0% |
| Hudson, IN | 504 | 45 | 10.0% |
| Miltonvale, KS | 504 | 32 | 36.0% |
| Simla, CO | 504 | 45 | 10.0% |
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