| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 48°F | 37°F | 14.0" |
| February | 33°F | 54°F | 41°F | 4.0" |
| March | 44°F | 66°F | 53°F | 2.2" |
| April | 46°F | 69°F | 56°F | 6.4" |
| May | 57°F | 79°F | 66°F | 6.4" |
| June | 65°F | 86°F | 74°F | 8.7" |
| July | 67°F | 89°F | 77°F | 10.0" |
| August | 70°F | 92°F | 79°F | 12.5" |
| September | 63°F | 86°F | 73°F | 10.7" |
| October | 49°F | 74°F | 60°F | 6.1" |
| November | 41°F | 64°F | 50°F | 31.2" |
| December | 29°F | 51°F | 38°F | 4.9" |
| Index | Copeland | Oklahoma | National |
| Air quality index | 38 | 55 | 42 |
| Pollution index | 703,846 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 289 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.250% |
| City | Population | Air Quality Index | National Avg. |
| Drowning Creek, OK | 165 | 38 | 24.0% |
| Langley, OK | 596 | 38 | 24.0% |
| Cayuga, OK | 152 | 38 | 24.0% |
| Welch, OK | 663 | 38 | 24.0% |
| Narcissa, OK | 137 | 38 | 24.0% |
| Copeland, OK | 1,725 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Drexel, NC | 1,725 | 43 | 14.0% |
| Sea Girt, NJ | 1,725 | 51 | 2.0% |
| Hazen, AR | 1,724 | 45 | 10.0% |
| De Pue, IL | 1,724 | 0 | 100.0% |
| Mechanicsville, MD | 1,724 | 47 | 6.0% |
| Copeland, OK | 1,725 | 38 | 24.0% |
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