| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 54°F | 41°F | 4.9" |
| February | 35°F | 58°F | 45°F | 9.2" |
| March | 45°F | 68°F | 55°F | 3.8" |
| April | 52°F | 76°F | 63°F | 9.1" |
| May | 60°F | 81°F | 69°F | 7.5" |
| June | 70°F | 90°F | 80°F | 10.7" |
| July | 73°F | 95°F | 83°F | 10.6" |
| August | 72°F | 95°F | 83°F | 1.4" |
| September | 64°F | 87°F | 75°F | 9.2" |
| October | 53°F | 77°F | 63°F | 6.3" |
| November | 43°F | 66°F | 53°F | 10.9" |
| December | 33°F | 54°F | 42°F | 5.6" |
| Index | Foster | Oklahoma | National |
| Air quality index | 43 | 55 | 42 |
| Pollution index | 1,022,930 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 80 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Pauls Valley, OK | 6,128 | 43 | 14.0% |
| Velma, OK | 641 | 43 | 14.0% |
| Elmore City, OK | 934 | 43 | 14.0% |
| Katie, OK | 429 | 43 | 14.0% |
| Tatums, OK | 168 | 43 | 14.0% |
| Foster, OK | 310 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Campbell Station, AR | 310 | 45 | 10.0% |
| Floyd, IA | 310 | 15 | 70.0% |
| Holy Cross, IA | 310 | 29 | 42.0% |
| Elliott, IL | 310 | 42 | 16.0% |
| Walloon Lake, MI | 310 | 36 | 28.0% |
| Foster, OK | 310 | 43 | 14.0% |
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