| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 51°F | 73°F | 61°F | 2.6" |
| February | 52°F | 74°F | 63°F | 2.8" |
| March | 57°F | 79°F | 67°F | 2.9" |
| April | 64°F | 84°F | 73°F | 2.9" |
| May | 69°F | 88°F | 78°F | 3.3" |
| June | 74°F | 90°F | 82°F | 8.5" |
| July | 76°F | 91°F | 83°F | 8.5" |
| August | 76°F | 92°F | 83°F | 9.7" |
| September | 75°F | 91°F | 81°F | 6.3" |
| October | 68°F | 86°F | 76°F | 2.3" |
| November | 59°F | 80°F | 68°F | 1.6" |
| December | 56°F | 76°F | 65°F | 1.4" |
| Index | Keystone | Florida | National |
| Air quality index | 43 | 35 | 42 |
| Pollution index | 5,828,380 | 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 | 0.004% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.050% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Hudson, FL | 11,243 | 43 | 14.0% |
| Jasmine Estates, FL | 22,572 | 43 | 14.0% |
| Safety Harbor, FL | 17,893 | 43 | 14.0% |
| Citrus Park, FL | 27,333 | 43 | 14.0% |
| Lutz, FL | 22,871 | 43 | 14.0% |
| Keystone, FL | 25,377 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Bay Point, CA | 25,378 | 40 | 20.0% |
| Thetford Mines, QC | 25,383 | n/a | |
| Kingsville, TX | 25,367 | 30 | 40.0% |
| Tarpon Springs, FL | 25,389 | 43 | 14.0% |
| Woodstock, IL | 25,391 | 42 | 16.0% |
| Keystone, FL | 25,377 | 43 | 14.0% |
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