| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 49°F | 66°F | 56°F | 1.8" |
| February | 51°F | 68°F | 58°F | 1.5" |
| March | 55°F | 72°F | 63°F | 1.9" |
| April | 62°F | 77°F | 70°F | 0.0" |
| May | 68°F | 81°F | 75°F | 0.4" |
| June | 72°F | 86°F | 79°F | 5.2" |
| July | 74°F | 87°F | 80°F | 5.3" |
| August | 75°F | 87°F | 80°F | 4.0" |
| September | 73°F | 84°F | 79°F | 2.8" |
| October | 67°F | 79°F | 73°F | 3.2" |
| November | 59°F | 72°F | 65°F | 3.8" |
| December | 54°F | 69°F | 60°F | 1.4" |
| Index | Welaka | Florida | National |
| Air quality index | 17 | 35 | 42 |
| Pollution index | 5,184,880 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 352 |
| Days with good air quality | 347 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.190% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.070% |
| Lead | 0.060% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Interlachen, FL | 1,843 | 17 | 66.0% |
| Crescent City, FL | 1,704 | 17 | 66.0% |
| Palatka, FL | 10,388 | 17 | 66.0% |
| East Palatka, FL | 1,625 | 17 | 66.0% |
| Pomona Park, FL | 1,179 | 17 | 66.0% |
| Welaka, FL | 955 | 17 | 66.0% |
| City | Population | Air Quality Index | National Avg. |
| Nunapitchuk, AK | 955 | 31 | 38.0% |
| Beale AFB, CA | 955 | 44 | 12.0% |
| Underwood, IA | 955 | 40 | 20.0% |
| Raymond, IL | 955 | 40 | 20.0% |
| English, IN | 955 | 6 | 88.0% |
| Welaka, FL | 955 | 17 | 66.0% |
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