| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 51°F | 72°F | 61°F | 2.4" |
| February | 49°F | 72°F | 60°F | 4.1" |
| March | 54°F | 77°F | 65°F | 6.0" |
| April | 57°F | 80°F | 69°F | 7.2" |
| May | 65°F | 86°F | 75°F | 6.1" |
| June | 72°F | 89°F | 79°F | 9.0" |
| July | 75°F | 92°F | 82°F | 7.7" |
| August | 76°F | 94°F | 83°F | 10.2" |
| September | 73°F | 91°F | 80°F | 6.2" |
| October | 71°F | 86°F | 77°F | 11.6" |
| November | 57°F | 79°F | 67°F | 1.9" |
| December | 52°F | 73°F | 61°F | 2.7" |
| Index | Umatilla | Florida | National |
| Air quality index | 37 | 35 | 42 |
| Pollution index | 12,822,300 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 355 |
| Days with good air quality | 321 |
| Days with moderate air quality | 34 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.160% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.270% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Altoona, FL | 77 | 37 | 26.0% |
| Pine Lakes, FL | 1,127 | 37 | 26.0% |
| Tangerine, FL | 2,947 | 37 | 26.0% |
| Eustis, FL | 21,010 | 37 | 26.0% |
| Mount Dora, FL | 14,201 | 37 | 26.0% |
| Umatilla, FL | 3,814 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Leo-Cedarville, IN | 3,814 | 45 | 10.0% |
| Dundas, NB | 3,812 | n/a | |
| Warwick, ON | 3,811 | n/a | |
| Coal Valley, IL | 3,817 | 46 | 8.0% |
| Dwight, IL | 3,817 | 0 | 100.0% |
| Umatilla, FL | 3,814 | 37 | 26.0% |
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