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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 44°F | 27°F | 0.1" |
| February | 16°F | 46°F | 30°F | 0.1" |
| March | 24°F | 56°F | 39°F | 0.2" |
| April | 31°F | 61°F | 45°F | 1.0" |
| May | 41°F | 71°F | 55°F | 1.3" |
| June | 51°F | 83°F | 65°F | 1.1" |
| July | 55°F | 82°F | 67°F | 2.6" |
| August | 54°F | 82°F | 67°F | 2.6" |
| September | 47°F | 76°F | 60°F | 0.9" |
| October | 34°F | 63°F | 46°F | 0.5" |
| November | 23°F | 54°F | 38°F | 0.1" |
| December | 15°F | 42°F | 27°F | 0.1" |
| Index | Calhan | 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. |
| Elbert, CO | 220 | 45 | 10.0% |
| Ellicott, CO | 1,012 | 45 | 10.0% |
| Ramah, CO | 164 | 45 | 10.0% |
| Peyton, CO | 0 | 45 | 10.0% |
| Simla, CO | 504 | 45 | 10.0% |
| Calhan, CO | 463 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Bellefonte, AR | 463 | 36 | 28.0% |
| Yampa, CO | 463 | 47 | 6.0% |
| Lostant, IL | 463 | 0 | 100.0% |
| Alta Vista, KS | 463 | 32 | 36.0% |
| Oden, MI | 463 | 36 | 28.0% |
| Calhan, CO | 463 | 45 | 10.0% |
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