| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 41°F | 26°F | 1.3" |
| February | 19°F | 52°F | 34°F | 0.5" |
| March | 25°F | 63°F | 43°F | 2.3" |
| April | 32°F | 64°F | 47°F | 5.6" |
| May | 40°F | 69°F | 53°F | 4.6" |
| June | 52°F | 86°F | 69°F | 3.2" |
| July | 56°F | 90°F | 73°F | 4.7" |
| August | 52°F | 88°F | 69°F | 3.0" |
| September | 47°F | 84°F | 64°F | 1.9" |
| October | 36°F | 72°F | 53°F | 3.1" |
| November | 20°F | 54°F | 35°F | 1.7" |
| December | 11°F | 40°F | 24°F | 1.4" |
| Index | Merino | Colorado | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 821,360 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 252 |
| Days with moderate air quality | 110 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Atwood, CO | 155 | 45 | 10.0% |
| Morgan Heights, CO | 227 | 45 | 10.0% |
| Hillrose, CO | 312 | 45 | 10.0% |
| Sterling, CO | 14,421 | 45 | 10.0% |
| Snyder, CO | 152 | 45 | 10.0% |
| Merino, CO | 272 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Panama, IA | 272 | 40 | 20.0% |
| Donovan, IL | 272 | 42 | 16.0% |
| Gagetown, MI | 272 | 26 | 48.0% |
| Finesville, NJ | 272 | 42 | 16.0% |
| La Jara, NM | 272 | 8 | 84.0% |
| Merino, CO | 272 | 45 | 10.0% |
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