| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 48°F | 38°F | 1.1" |
| February | 35°F | 54°F | 43°F | 1.4" |
| March | 45°F | 66°F | 54°F | 6.7" |
| April | 48°F | 70°F | 58°F | 1.9" |
| May | 59°F | 79°F | 68°F | 3.7" |
| June | 67°F | 89°F | 77°F | 8.7" |
| July | 69°F | 92°F | 80°F | 3.0" |
| August | 71°F | 93°F | 81°F | 10.3" |
| September | 65°F | 89°F | 76°F | 5.7" |
| October | 53°F | 77°F | 63°F | 4.0" |
| November | 40°F | 67°F | 51°F | 0.3" |
| December | 29°F | 50°F | 38°F | 0.7" |
| Index | Willow | Oklahoma | National |
| Air quality index | 43 | 55 | 42 |
| Pollution index | 311,261 | 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 | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Lone Wolf, OK | 422 | 43 | 14.0% |
| Mangum, OK | 2,743 | 43 | 14.0% |
| Carter, OK | 195 | 43 | 14.0% |
| Granite, OK | 1,753 | 43 | 14.0% |
| Willow, OK | 234 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Elmira, CA | 234 | 35 | 30.0% |
| Fredonia, IA | 234 | 32 | 36.0% |
| Colp, IL | 234 | 43 | 14.0% |
| Lake Ka-Ho, IL | 234 | 54 | 8.0% |
| Americus, IN | 234 | 42 | 16.0% |
| Willow, OK | 234 | 43 | 14.0% |
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