| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 39°F | 25°F | 0.6" |
| February | 16°F | 43°F | 29°F | 0.8" |
| March | 28°F | 58°F | 42°F | 1.3" |
| April | 39°F | 68°F | 53°F | 3.3" |
| May | 49°F | 78°F | 63°F | 5.7" |
| June | 61°F | 88°F | 74°F | 5.4" |
| July | 65°F | 92°F | 78°F | 3.1" |
| August | 62°F | 89°F | 75°F | 4.4" |
| September | 53°F | 83°F | 67°F | 4.6" |
| October | 40°F | 70°F | 54°F | 3.2" |
| November | 28°F | 57°F | 41°F | 1.0" |
| December | 16°F | 41°F | 27°F | 1.5" |
| Index | Roca | Nebraska | National |
| Air quality index | 31 | 86 | 42 |
| Pollution index | 648,221 | 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 | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Cortland, NE | 550 | 31 | 38.0% |
| Douglas, NE | 267 | 31 | 38.0% |
| Alvo, NE | 124 | 31 | 38.0% |
| Palmyra, NE | 670 | 31 | 38.0% |
| Yankee Hill, NE | 217 | 31 | 38.0% |
| Roca, NE | 130 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Pitkas Point, AK | 130 | 31 | 38.0% |
| McKittrick, CA | 130 | 67 | 34.0% |
| Parrott, GA | 130 | 39 | 22.0% |
| Atlanta, KS | 130 | 40 | 20.0% |
| Beverly, KS | 130 | 32 | 36.0% |
| Roca, NE | 130 | 31 | 38.0% |
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