| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 41°F | 31°F | 1.1" |
| February | 25°F | 50°F | 37°F | 0.8" |
| March | 30°F | 59°F | 44°F | 0.8" |
| April | 34°F | 67°F | 51°F | 0.5" |
| May | 42°F | 77°F | 60°F | 1.0" |
| June | 48°F | 83°F | 67°F | 0.4" |
| July | 55°F | 93°F | 76°F | 0.1" |
| August | 53°F | 92°F | 73°F | 0.2" |
| September | 44°F | 82°F | 63°F | 0.4" |
| October | 36°F | 67°F | 50°F | 0.8" |
| November | 27°F | 52°F | 39°F | 0.9" |
| December | 20°F | 40°F | 29°F | 1.5" |
| Index | Toppenish | Washington | National |
| Air quality index | 38 | 36 | 42 |
| Pollution index | 697,942 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 227 |
| Days with moderate air quality | 128 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Granger, WA | 3,806 | 38 | 24.0% |
| Moxee, WA | 4,111 | 38 | 24.0% |
| Zillah, WA | 3,137 | 38 | 24.0% |
| Ahtanum, WA | 3,701 | 38 | 24.0% |
| Outlook, WA | 158 | 38 | 24.0% |
| Toppenish, WA | 8,872 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Olney, IL | 8,872 | 36 | 28.0% |
| Farmingdale, NY | 8,869 | 51 | 2.0% |
| South Amboy, NJ | 8,868 | 51 | 2.0% |
| Newark, NY | 8,868 | 37 | 26.0% |
| New Windsor, NY | 8,866 | 36 | 28.0% |
| Toppenish, WA | 8,872 | 38 | 24.0% |
Here are the best places to live in Washington
Check out the 10 most dangerous cities in Washington
Check out the 10 safest cities in Washington
Safest Cities In The US