| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 44°F | 27°F | 0.4" |
| February | 16°F | 47°F | 29°F | 0.6" |
| March | 25°F | 60°F | 40°F | 0.9" |
| April | 32°F | 66°F | 47°F | 2.0" |
| May | 41°F | 74°F | 56°F | 3.0" |
| June | 52°F | 87°F | 69°F | 2.7" |
| July | 59°F | 94°F | 75°F | 1.5" |
| August | 56°F | 91°F | 72°F | 1.3" |
| September | 46°F | 84°F | 62°F | 1.3" |
| October | 33°F | 68°F | 49°F | 1.2" |
| November | 23°F | 57°F | 37°F | 0.8" |
| December | 11°F | 42°F | 25°F | 0.7" |
| Index | McGrew | Nebraska | National |
| Air quality index | 19 | 86 | 42 |
| Pollution index | 656,658 | 590,627 | 2,726,193 |
| Measurement | Total |
| Days measured | 113 |
| Days with good air quality | 110 |
| Days with moderate air quality | 3 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Minatare, NE | 937 | 19 | 62.0% |
| Bayard, NE | 1,319 | 19 | 62.0% |
| Scottsbluff, NE | 14,660 | 19 | 62.0% |
| Gering, NE | 8,179 | 19 | 62.0% |
| Terrytown, NE | 1,013 | 19 | 62.0% |
| McGrew, NE | 111 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Myrtlewood, AL | 111 | 36 | 28.0% |
| Gum Springs, AR | 111 | 32 | 36.0% |
| Success, AR | 111 | 26 | 48.0% |
| Gazelle, CA | 111 | 36 | 28.0% |
| Orchard, CO | 111 | 45 | 10.0% |
| McGrew, NE | 111 | 19 | 62.0% |
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