| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 49°F | 39°F | 2.6" |
| February | 34°F | 57°F | 43°F | 2.0" |
| March | 37°F | 61°F | 48°F | 2.2" |
| April | 40°F | 67°F | 52°F | 1.4" |
| May | 47°F | 77°F | 60°F | 1.2" |
| June | 52°F | 84°F | 67°F | 0.8" |
| July | 59°F | 94°F | 76°F | 0.3" |
| August | 58°F | 94°F | 75°F | 0.3" |
| September | 51°F | 87°F | 67°F | 0.6" |
| October | 43°F | 72°F | 55°F | 1.5" |
| November | 37°F | 56°F | 45°F | 2.8" |
| December | 32°F | 47°F | 38°F | 3.7" |
| Index | Trail | Oregon | National |
| Air quality index | 36 | 32 | 42 |
| Pollution index | 13,842,600 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 295 |
| Days with moderate air quality | 63 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 4 |
| 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. |
| Shady Cove, OR | 3,090 | 36 | 28.0% |
| Butte Falls, OR | 437 | 36 | 28.0% |
| Eagle Point, OR | 9,316 | 36 | 28.0% |
| Trail, OR | 1,029 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Hillsdale, MO | 1,029 | 54 | 8.0% |
| Mississippi Valley State University, MS | 1,029 | 43 | 14.0% |
| Williamsdale, OH | 1,029 | 54 | 8.0% |
| Markham, TX | 1,029 | 31 | 38.0% |
| Wallingford, VT | 1,029 | 36 | 28.0% |
| Trail, OR | 1,029 | 36 | 28.0% |
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