| 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% |
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