| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 44°F | 38°F | 6.6" |
| February | 33°F | 45°F | 38°F | 6.4" |
| March | 33°F | 47°F | 39°F | 6.7" |
| April | 35°F | 53°F | 42°F | 3.3" |
| May | 41°F | 63°F | 49°F | 2.2" |
| June | 46°F | 69°F | 55°F | 1.3" |
| July | 54°F | 78°F | 64°F | 0.3" |
| August | 55°F | 79°F | 65°F | 0.2" |
| September | 51°F | 72°F | 59°F | 1.0" |
| October | 44°F | 59°F | 50°F | 3.8" |
| November | 36°F | 47°F | 41°F | 6.1" |
| December | 31°F | 42°F | 36°F | 8.9" |
| Index | Merlin | Oregon | National |
| Air quality index | 26 | 32 | 42 |
| Pollution index | 13,842,600 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 283 |
| Days with moderate air quality | 77 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.210% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.030% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Grants Pass, OR | 37,938 | 26 | 48.0% |
| Rogue River, OR | 1,770 | 26 | 48.0% |
| New Hope, OR | 1,236 | 26 | 48.0% |
| Wimer, OR | 506 | 26 | 48.0% |
| Redwood, OR | 2,860 | 26 | 48.0% |
| Merlin, OR | 1,792 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Bethlehem Village, CT | 1,792 | 37 | 26.0% |
| Epworth, IA | 1,792 | 29 | 42.0% |
| French Lick, IN | 1,792 | 6 | 88.0% |
| Cottonport, LA | 1,792 | 30 | 40.0% |
| Queensland, MD | 1,792 | 47 | 6.0% |
| Merlin, OR | 1,792 | 26 | 48.0% |
Here are the best places to live in Oregon
Check out the 10 most dangerous cities in Oregon
Most Dangerous Cities In The US
These are the largest cities in Oregon