| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 37°F | 30°F | 1.1" |
| February | 27°F | 47°F | 36°F | 0.8" |
| March | 31°F | 56°F | 42°F | 1.1" |
| April | 36°F | 63°F | 49°F | 0.7" |
| May | 44°F | 74°F | 58°F | 1.2" |
| June | 51°F | 80°F | 64°F | 0.5" |
| July | 57°F | 91°F | 73°F | 0.2" |
| August | 56°F | 90°F | 71°F | 0.2" |
| September | 47°F | 80°F | 62°F | 0.4" |
| October | 38°F | 64°F | 49°F | 1.1" |
| November | 30°F | 48°F | 38°F | 1.3" |
| December | 22°F | 37°F | 29°F | 1.5" |
| Index | Kittitas | Washington | National |
| Air quality index | 23 | 36 | 42 |
| Pollution index | 2,683,410 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 305 |
| Days with moderate air quality | 60 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.030% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ellensburg, WA | 20,679 | 23 | 54.0% |
| Thorp, WA | 109 | 23 | 54.0% |
| Kittitas, WA | 1,342 | 23 | 54.0% |
| City | Population | Air Quality Index | National Avg. |
| Millbrook, NY | 1,342 | 36 | 28.0% |
| Albion, PA | 1,342 | 36 | 28.0% |
| Gray, TN | 1,342 | 45 | 10.0% |
| Mendon, UT | 1,342 | 44 | 12.0% |
| Independence, WI | 1,342 | 15 | 70.0% |
| Kittitas, WA | 1,342 | 23 | 54.0% |
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