| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 64°F | 52°F | 5.7" |
| February | 44°F | 68°F | 55°F | 5.4" |
| March | 51°F | 75°F | 62°F | 5.2" |
| April | 57°F | 81°F | 68°F | 6.7" |
| May | 64°F | 87°F | 75°F | 4.3" |
| June | 72°F | 92°F | 81°F | 7.9" |
| July | 74°F | 93°F | 82°F | 7.1" |
| August | 74°F | 93°F | 82°F | 6.6" |
| September | 70°F | 90°F | 79°F | 5.5" |
| October | 58°F | 83°F | 70°F | 4.2" |
| November | 48°F | 74°F | 60°F | 2.8" |
| December | 47°F | 68°F | 56°F | 6.6" |
| Index | Harold | Florida | National |
| Air quality index | 41 | 35 | 42 |
| Pollution index | 4,186,460 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 279 |
| Days with moderate air quality | 85 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.050% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Munson, FL | 301 | 41 | 18.0% |
| Gonzalez, FL | 14,243 | 41 | 18.0% |
| Chumuckla, FL | 958 | 41 | 18.0% |
| Garcon Point, FL | 500 | 41 | 18.0% |
| Pea Ridge, FL | 4,817 | 41 | 18.0% |
| Harold, FL | 1,070 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Vanceboro, NC | 1,070 | 0 | 100.0% |
| Seiling, OK | 1,070 | 48 | 4.0% |
| Membertou 28B, NS | 1,070 | n/a | |
| Powell, AL | 1,071 | 39 | 22.0% |
| Bodega Bay, CA | 1,069 | 34 | 32.0% |
| Harold, FL | 1,070 | 41 | 18.0% |
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