| 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 | Francis | Oklahoma | National |
| Air quality index | 36 | 55 | 42 |
| Pollution index | 898,233 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 231 |
| Days with good air quality | 216 |
| Days with moderate air quality | 14 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Spaulding, OK | 100 | 36 | 28.0% |
| Latta, OK | 1,021 | 36 | 28.0% |
| Holdenville, OK | 5,662 | 36 | 28.0% |
| Konawa, OK | 1,139 | 36 | 28.0% |
| Byng, OK | 1,207 | 36 | 28.0% |
| Francis, OK | 324 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Shaktoolik, AK | 324 | 38 | 24.0% |
| Etowah, AR | 324 | 45 | 10.0% |
| Grangeville, CA | 324 | 56 | 12.0% |
| Las Flores CDP (Tehama County), CA | 324 | 89 | 78.0% |
| Stonefort, IL | 324 | 44 | 12.0% |
| Francis, OK | 324 | 36 | 28.0% |
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