| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 39°F | 33°F | 2.3" |
| February | 30°F | 48°F | 38°F | 1.2" |
| March | 35°F | 56°F | 46°F | 1.7" |
| April | 41°F | 65°F | 53°F | 1.6" |
| May | 49°F | 75°F | 62°F | 1.4" |
| June | 56°F | 83°F | 69°F | 2.8" |
| July | 64°F | 93°F | 79°F | 0.7" |
| August | 61°F | 92°F | 77°F | 1.0" |
| September | 53°F | 82°F | 68°F | 1.2" |
| October | 42°F | 64°F | 53°F | 2.1" |
| November | 33°F | 49°F | 41°F | 1.3" |
| December | 25°F | 37°F | 31°F | 1.8" |
| Index | Grandview | Washington | National |
| Air quality index | 37 | 36 | 42 |
| Pollution index | 697,942 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 303 |
| Days with moderate air quality | 62 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Prosser, WA | 6,288 | 37 | 26.0% |
| Granger, WA | 3,806 | 38 | 24.0% |
| Sunnyside, WA | 16,703 | 38 | 24.0% |
| Mabton, WA | 2,192 | 38 | 24.0% |
| Outlook, WA | 158 | 38 | 24.0% |
| Grandview, WA | 11,075 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Forest, VA | 11,075 | 26 | 48.0% |
| Celebration, FL | 11,077 | 39 | 22.0% |
| Kaneohe Station, HI | 11,072 | 30 | 40.0% |
| Lindon, UT | 11,072 | 46 | 8.0% |
| Two Rivers, WI | 11,079 | 36 | 28.0% |
| Grandview, WA | 11,075 | 37 | 26.0% |
Here are the best places to live in Washington
These are the largest cities in Washington
Check out the 10 safest cities in Washington
See the best places to live in Grandview