| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 39°F | 24°F | 0.4" |
| February | 13°F | 42°F | 26°F | 0.9" |
| March | 24°F | 56°F | 38°F | 1.3" |
| April | 33°F | 64°F | 47°F | 2.6" |
| May | 43°F | 74°F | 58°F | 3.9" |
| June | 54°F | 85°F | 69°F | 4.4" |
| July | 60°F | 93°F | 76°F | 2.7" |
| August | 58°F | 89°F | 73°F | 2.7" |
| September | 48°F | 82°F | 64°F | 1.8" |
| October | 35°F | 67°F | 49°F | 1.6" |
| November | 22°F | 55°F | 36°F | 0.4" |
| December | 11°F | 38°F | 23°F | 0.6" |
| Index | Valentine | Nebraska | National |
| Air quality index | 19 | 86 | 42 |
| Pollution index | 167,591 | 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 | 0.003% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Crookston, NE | 62 | 44 | 12.0% |
| Valentine, NE | 2,867 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Osage City, KS | 2,867 | 22 | 56.0% |
| Lakeside Park, KY | 2,867 | 54 | 8.0% |
| Lena, IL | 2,866 | 42 | 16.0% |
| Northeast Ithaca, NY | 2,866 | 34 | 32.0% |
| Coalhurst, AB | 2,866 | n/a | |
| Valentine, NE | 2,867 | 19 | 62.0% |