| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 43°F | 28°F | 0.1" |
| February | 17°F | 45°F | 29°F | 0.3" |
| March | 25°F | 58°F | 40°F | 0.5" |
| April | 32°F | 63°F | 46°F | 2.1" |
| May | 41°F | 72°F | 55°F | 3.1" |
| June | 53°F | 85°F | 68°F | 3.3" |
| July | 59°F | 92°F | 75°F | 2.2" |
| August | 56°F | 90°F | 72°F | 2.1" |
| September | 47°F | 82°F | 63°F | 1.7" |
| October | 35°F | 66°F | 49°F | 1.1" |
| November | 23°F | 55°F | 38°F | 0.3" |
| December | 13°F | 41°F | 26°F | 0.3" |
| Index | Sidney | Nebraska | National |
| Air quality index | 19 | 86 | 42 |
| Pollution index | 362,100 | 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 | 0.001% |
| Lead | 0.030% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Gurley, NE | 266 | 19 | 62.0% |
| Lorenzo, NE | 20 | 19 | 62.0% |
| Sunol, NE | 112 | 19 | 62.0% |
| Peetz, CO | 256 | 19 | 62.0% |
| Sidney, NE | 6,451 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Bronxville, NY | 6,450 | 51 | 2.0% |
| Ewa Villages, HI | 6,452 | 30 | 40.0% |
| Plattsmouth, NE | 6,453 | 40 | 20.0% |
| Eucalyptus Hills, CA | 6,448 | 64 | 28.0% |
| Keene, TX | 6,456 | 33 | 34.0% |
| Sidney, NE | 6,451 | 19 | 62.0% |
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