| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 48°F | 40°F | 4.8" |
| February | 36°F | 53°F | 43°F | 4.0" |
| March | 39°F | 57°F | 47°F | 5.0" |
| April | 40°F | 62°F | 50°F | 2.8" |
| May | 45°F | 70°F | 56°F | 1.8" |
| June | 49°F | 76°F | 61°F | 1.2" |
| July | 53°F | 85°F | 68°F | 0.2" |
| August | 52°F | 86°F | 68°F | 0.3" |
| September | 49°F | 80°F | 63°F | 1.2" |
| October | 43°F | 66°F | 54°F | 3.9" |
| November | 39°F | 54°F | 46°F | 6.3" |
| December | 34°F | 47°F | 40°F | 6.2" |
| Index | Yamhill | Oregon | National |
| Air quality index | 38 | 32 | 42 |
| Pollution index | 3,182,180 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 77 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.190% |
| Mercury | 0.110% |
| City | Population | Air Quality Index | National Avg. |
| St. Paul, OR | 396 | 32 | 36.0% |
| McMinnville, OR | 34,466 | 32 | 36.0% |
| Dundee, OR | 3,296 | 32 | 36.0% |
| Carlton, OR | 2,135 | 32 | 36.0% |
| Lafayette, OR | 4,222 | 32 | 36.0% |
| Yamhill, OR | 1,336 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Diamond Ridge, AK | 1,336 | 31 | 38.0% |
| Sultana, CA | 1,336 | 66 | 32.0% |
| Irvington, KY | 1,336 | 39 | 22.0% |
| Saint-Odilon-de-Cranbourne, QC | 1,336 | n/a | |
| Cartwright-Roblin, MB | 1,336 | n/a | |
| Yamhill, OR | 1,336 | 38 | 24.0% |
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