| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 51°F | 71°F | 60°F | 2.0" |
| February | 51°F | 71°F | 60°F | 2.0" |
| March | 57°F | 77°F | 66°F | 2.7" |
| April | 63°F | 83°F | 72°F | 3.4" |
| May | 69°F | 88°F | 77°F | 3.0" |
| June | 73°F | 91°F | 81°F | 4.9" |
| July | 75°F | 90°F | 81°F | 6.4" |
| August | 75°F | 91°F | 81°F | 7.8" |
| September | 73°F | 89°F | 80°F | 2.6" |
| October | 68°F | 85°F | 75°F | 1.6" |
| November | 57°F | 77°F | 66°F | 1.1" |
| December | 57°F | 75°F | 65°F | 1.6" |
| Index | Polk City | Florida | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 26,458,600 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 314 |
| Days with moderate air quality | 51 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.140% |
| Benzene | 0.280% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.080% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| Crystal Lake, FL | 6,427 | 36 | 28.0% |
| Lakeland Highlands, FL | 11,828 | 36 | 28.0% |
| Davenport, FL | 5,569 | 36 | 28.0% |
| Haines City, FL | 26,146 | 36 | 28.0% |
| Lake Hamilton, FL | 1,574 | 36 | 28.0% |
| Polk City, FL | 2,510 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Bono, AR | 2,510 | 45 | 10.0% |
| Wright-Patterson AFB, OH | 2,510 | 47 | 6.0% |
| Oakhurst, OK | 2,510 | 45 | 10.0% |
| New Palestine, IN | 2,509 | 54 | 8.0% |
| Koloa, HI | 2,511 | 13 | 74.0% |
| Polk City, FL | 2,510 | 36 | 28.0% |