| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 52°F | 72°F | 61°F | 2.9" |
| February | 54°F | 73°F | 63°F | 2.4" |
| March | 59°F | 78°F | 68°F | 2.5" |
| April | 65°F | 83°F | 74°F | 2.3" |
| May | 70°F | 88°F | 78°F | 2.7" |
| June | 75°F | 90°F | 82°F | 9.4" |
| July | 76°F | 91°F | 83°F | 9.2" |
| August | 77°F | 91°F | 83°F | 9.7" |
| September | 76°F | 90°F | 81°F | 6.4" |
| October | 69°F | 85°F | 76°F | 2.0" |
| November | 60°F | 78°F | 68°F | 1.1" |
| December | 58°F | 76°F | 65°F | 1.3" |
| Index | Largo | Florida | National |
| Air quality index | 43 | 35 | 42 |
| Pollution index | 966,644 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 267 |
| Days with moderate air quality | 92 |
| Days w/ poor A.Q. for sensitive groups | 6 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Gulfport, FL | 12,334 | 38 | 24.0% |
| St. Pete Beach, FL | 9,603 | 38 | 24.0% |
| South Pasadena, FL | 5,090 | 38 | 24.0% |
| Treasure Island, FL | 6,910 | 38 | 24.0% |
| West Lealman, FL | 14,304 | 43 | 14.0% |
| Largo, FL | 84,666 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Lake Forest, CA | 84,666 | 89 | 78.0% |
| Danbury, CT | 84,650 | 43 | 14.0% |
| Hemet, CA | 84,686 | 89 | 78.0% |
| Bloomington, IN | 84,691 | 42 | 16.0% |
| New Braunfels, TX | 84,622 | 49 | 2.0% |
| Largo, FL | 84,666 | 43 | 14.0% |
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