| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 35°F | 24°F | 1.2" |
| February | 17°F | 39°F | 26°F | 1.4" |
| March | 29°F | 54°F | 40°F | 5.7" |
| April | 39°F | 64°F | 50°F | 5.3" |
| May | 50°F | 75°F | 61°F | 8.2" |
| June | 61°F | 85°F | 72°F | 8.5" |
| July | 65°F | 88°F | 76°F | 6.0" |
| August | 62°F | 84°F | 72°F | 6.4" |
| September | 54°F | 79°F | 65°F | 4.7" |
| October | 40°F | 65°F | 51°F | 6.4" |
| November | 28°F | 52°F | 39°F | 2.2" |
| December | 16°F | 36°F | 25°F | 2.7" |
| Index | Garrison | Nebraska | National |
| Air quality index | 31 | 86 | 42 |
| Pollution index | 206,104 | 590,627 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 338 |
| Days with moderate air quality | 22 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Gresham, NE | 219 | 31 | 38.0% |
| Octavia, NE | 167 | 31 | 38.0% |
| Shelby, NE | 714 | 31 | 38.0% |
| Bruno, NE | 92 | 31 | 38.0% |
| Staplehurst, NE | 320 | 31 | 38.0% |
| Garrison, NE | 33 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Panola, AL | 33 | 36 | 28.0% |
| El Capitan, AZ | 33 | 47 | 6.0% |
| Imogene, IA | 33 | 40 | 20.0% |
| Deer Grove, IL | 33 | 42 | 16.0% |
| Westervelt, IL | 33 | 44 | 12.0% |
| Garrison, NE | 33 | 31 | 38.0% |
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