| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 47°F | 37°F | 6.5" |
| February | 35°F | 55°F | 43°F | 3.2" |
| March | 45°F | 67°F | 55°F | 8.3" |
| April | 50°F | 70°F | 58°F | 3.9" |
| May | 61°F | 78°F | 68°F | 10.4" |
| June | 68°F | 86°F | 76°F | 15.7" |
| July | 70°F | 89°F | 79°F | 13.1" |
| August | 72°F | 92°F | 81°F | 12.2" |
| September | 67°F | 86°F | 75°F | 8.9" |
| October | 54°F | 76°F | 63°F | 6.0" |
| November | 43°F | 67°F | 53°F | 2.1" |
| December | 30°F | 50°F | 39°F | 3.9" |
| Index | Spencer | Oklahoma | National |
| Air quality index | 48 | 55 | 42 |
| Pollution index | 715,482 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 204 |
| Days with moderate air quality | 159 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.100% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.030% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Harrah, OK | 6,480 | 36 | 28.0% |
| McLoud, OK | 3,988 | 36 | 28.0% |
| Jones, OK | 3,129 | 48 | 4.0% |
| The Village, OK | 9,500 | 48 | 4.0% |
| Forest Park, OK | 979 | 48 | 4.0% |
| Spencer, OK | 3,985 | 48 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Planada, CA | 3,984 | 48 | 4.0% |
| Goodland, KS | 3,986 | 15 | 70.0% |
| Cleveland, GA | 3,983 | 37 | 26.0% |
| Manchester, GA | 3,982 | 42 | 16.0% |
| Wahneta, FL | 3,988 | 36 | 28.0% |
| Spencer, OK | 3,985 | 48 | 4.0% |
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