| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 55°F | 48°F | 8.2" |
| February | 42°F | 55°F | 48°F | 7.1" |
| March | 43°F | 55°F | 49°F | 9.3" |
| April | 44°F | 56°F | 50°F | 5.4" |
| May | 47°F | 58°F | 52°F | 2.4" |
| June | 49°F | 61°F | 55°F | 1.8" |
| July | 51°F | 62°F | 56°F | 0.3" |
| August | 52°F | 63°F | 57°F | 0.3" |
| September | 50°F | 63°F | 56°F | 1.3" |
| October | 48°F | 62°F | 54°F | 5.1" |
| November | 44°F | 58°F | 51°F | 8.8" |
| December | 41°F | 54°F | 47°F | 11.4" |
| Index | Klamath | California | National |
| Air quality index | 20 | 55 | 50 |
| Pollution index | 13,842,600 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 248 |
| Days with good air quality | 236 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.210% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.030% |
| Mercury | 0.020% |
| City, State | Population | Air Quality Index | National Avg. |
| Klamath, CA | 881 | 20 | 60% |
| City, State | Population | Air Quality Index | National Avg. |
| Lumberport, WV | 881 | 31 | 38% |
| Annville, KY | 881 | 33 | 34% |
| Rio Grande, OH | 881 | 14 | 72% |
| Marblehead, OH | 881 | 1 | 98% |
| Schoharie, NY | 881 | 37 | 26% |
| Klamath, CA | 881 | 20 | 60% |
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