| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 46°F | 28°F | 0.2" |
| February | 18°F | 50°F | 33°F | 0.2" |
| March | 27°F | 65°F | 45°F | 0.4" |
| April | 36°F | 72°F | 53°F | 1.0" |
| May | 45°F | 81°F | 62°F | 1.7" |
| June | 57°F | 94°F | 75°F | 1.7" |
| July | 63°F | 96°F | 79°F | 2.7" |
| August | 60°F | 93°F | 76°F | 2.4" |
| September | 51°F | 87°F | 68°F | 1.2" |
| October | 37°F | 73°F | 53°F | 0.6" |
| November | 25°F | 61°F | 41°F | 0.2" |
| December | 14°F | 46°F | 28°F | 0.3" |
| Index | Lamar | Colorado | National |
| Air quality index | 20 | 38 | 42 |
| Pollution index | 2,329,650 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 126 |
| Days with good air quality | 125 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.270% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.390% |
| Mercury | 0.270% |
| City | Population | Air Quality Index | National Avg. |
| West Frankfort, IL | 7,597 | 43 | 14.0% |
| Interlaken, CA | 7,596 | 35 | 30.0% |
| Oceano, CA | 7,601 | 46 | 8.0% |
| Clear Lake, IA | 7,594 | 15 | 70.0% |
| Sioux Center, IA | 7,592 | 35 | 30.0% |
| Lamar, CO | 7,598 | 20 | 60.0% |
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