| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 43°F | 28°F | 0.2" |
| February | 19°F | 46°F | 31°F | 0.3" |
| March | 29°F | 61°F | 43°F | 0.7" |
| April | 38°F | 68°F | 51°F | 2.7" |
| May | 48°F | 77°F | 61°F | 3.3" |
| June | 59°F | 89°F | 73°F | 3.2" |
| July | 64°F | 94°F | 78°F | 3.0" |
| August | 62°F | 90°F | 75°F | 3.6" |
| September | 52°F | 83°F | 66°F | 2.0" |
| October | 39°F | 70°F | 53°F | 1.4" |
| November | 27°F | 57°F | 40°F | 0.5" |
| December | 16°F | 42°F | 27°F | 0.6" |
| Index | McCook | Nebraska | National |
| Air quality index | 19 | 86 | 42 |
| Pollution index | 252,184 | 590,627 | 2,726,193 |
| Measurement | Total |
| Days measured | 60 |
| Days with good air quality | 55 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Indianola, NE | 499 | 19 | 62.0% |
| Danbury, NE | 52 | 19 | 62.0% |
| Culbertson, NE | 497 | 19 | 62.0% |
| McCook, NE | 7,555 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Jasper, TX | 7,556 | 45 | 10.0% |
| Escalon, CA | 7,553 | 49 | 2.0% |
| Newport, AR | 7,552 | 45 | 10.0% |
| Twin Lakes, CO | 7,552 | 58 | 16.0% |
| Corbin, KY | 7,558 | 40 | 20.0% |
| McCook, NE | 7,555 | 19 | 62.0% |
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