| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 51°F | 71°F | 61°F | 2.8" |
| February | 53°F | 74°F | 63°F | 2.0" |
| March | 57°F | 78°F | 68°F | 2.6" |
| April | 63°F | 84°F | 74°F | 1.9" |
| May | 67°F | 88°F | 78°F | 3.6" |
| June | 73°F | 90°F | 81°F | 10.9" |
| July | 74°F | 90°F | 82°F | 10.6" |
| August | 75°F | 91°F | 82°F | 9.7" |
| September | 73°F | 89°F | 81°F | 8.9" |
| October | 66°F | 84°F | 75°F | 3.6" |
| November | 58°F | 78°F | 68°F | 1.8" |
| December | 56°F | 75°F | 65°F | 1.2" |
| Index | Ona | Florida | National |
| Air quality index | 36 | 35 | 50 |
| Pollution index | 3,269,270 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 233 |
| Days with good air quality | 224 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Gardner, FL | 288 | 36 | 28% |
| Fort Green, FL | 146 | 36 | 28% |
| Wauchula, FL | 4,883 | 36 | 28% |
| Fort Green Springs, FL | 390 | 36 | 28% |
| Zolfo Springs, FL | 2,059 | 36 | 28% |
| Ona, FL | 65 | 36 | 28% |
| City, State | Population | Air Quality Index | National Avg. |
| Seaforth, MN | 65 | 32 | 36% |
| Los Arcos, TX | 65 | 41 | 18% |
| Richland, SD | 65 | 35 | 30% |
| Miltonsburg, OH | 65 | 39 | 22% |
| Bejou, MN | 65 | 33 | 34% |
| Ona, FL | 65 | 36 | 28% |
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