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Weather & Climate in Key Colony Beach, FL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Key Colony Beach has a warm climate with an average annual temperature of 79°F (26°C). Winters average 70°F in January while summers reach 85°F in July / relatively mild seasonal variation. The area gets 330 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 39.7 inches. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 3 feet.
Temperature
70°F Jan (21°C)
85°F Jul (30°C)
| Annual Average | 78.8°F |
| 46% above US avg | |
| January Average | 70°F (21°C) |
| July Average | 85°F (30°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 3 ft (1 m) |
| Area | 0.7 sq mi (1.7 km²) |
| Population Density | 1,193/sq mi |
| Coordinates | 24.7234°N, 81.0216°W |
| Timezone | America/New_York |
| County | Monroe County County |
| Nearest Airport | The Florida Keys Marathon International (MTH) 2 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 91.6 / 100 |
| Social Vulnerability | 53.9 / 100 |
| Community Resilience | 29.4 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Relatively High |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | No Rating |
| Lightning | Relatively High |
| Drought | No Rating |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Coastal Flood | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Hurricane History
20 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 5.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Rafael | Category 3 | 115 mph | 283 km |
| 2022 | Ian | Category 5 | 161 mph | 190 km |
| 2017 | Irma | Category 4 | 150 mph | 48 km |
| 2016 | Matthew | Category 4 | 138 mph | 285 km |
| 2008 | Ike | Category 1 | 81 mph | 292 km |
| 2005 | Dennis | Category 4 | 138 mph | 210 km |
| 2005 | Wilma | Category 3 | 127 mph | 148 km |
| 2005 | Rita | Category 3 | 109 mph | 103 km |
| 2005 | Katrina | Category 2 | 104 mph | 80 km |
| 2004 | Charley | Category 4 | 150 mph | 177 km |
| 2004 | Jeanne | Category 3 | 121 mph | 287 km |
| 2004 | Frances | Category 2 | 109 mph | 287 km |
| 2001 | Michelle | Category 4 | 132 mph | 225 km |
| 1999 | Irene | Category 1 | 81 mph | 43 km |
| 1998 | Georges | Category 2 | 104 mph | 78 km |
| 1996 | Lili | Category 2 | 98 mph | 259 km |
| 1992 | Andrew | Category 5 | 167 mph | 99 km |
| 1987 | Floyd | Category 1 | 75 mph | 48 km |
| 1985 | Kate | Category 2 | 109 mph | 192 km |
| 1982 | Alberto | Category 1 | 86 mph | 240 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
95 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 80 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 26, 2005 | EF2 | 6 km | 1.2 mi | 0 |
| Nov 4, 1998 | EF2 | 70 km | 12.0 mi | 0 |
| Apr 27, 1980 | EF2 | 41 km | 0.5 mi | 0 |
| Dec 20, 1973 | EF2 | 98 km | 7.6 mi | 0 |
| Jun 18, 1972 | EF2 | 68 km | 1.0 mi | 0 |
| Jun 18, 1972 | EF2 | 81 km | 1.5 mi | 0 |
| Jun 2, 1966 | EF2 | 79 km | 0.1 mi | 0 |
| Oct 9, 2024 | EF1 | 94 km | 2.9 mi | 0 |
| Oct 8, 2024 | EF1 | 82 km | 0.3 mi | 0 |
| Apr 15, 2018 | EF1 | 56 km | 0.9 mi | 0 |
| Sep 10, 2008 | EF1 | 33 km | 0.5 mi | 0 |
| Jan 2, 2002 | EF1 | 92 km | 10.0 mi | 0 |
| Oct 15, 1999 | EF1 | 28 km | 1.0 mi | 0 |
| Nov 4, 1998 | EF1 | 45 km | 2.0 mi | 0 |
| Feb 2, 1998 | EF1 | 6 km | 1.0 mi | 0 |
| May 22, 1997 | EF1 | 79 km | 0.3 mi | 0 |
| Oct 11, 1987 | EF1 | 70 km | 0.2 mi | 0 |
| Jun 21, 1986 | EF1 | 57 km | 0.1 mi | 0 |
| Jun 20, 1983 | EF1 | 56 km | 3.0 mi | 0 |
| Jun 3, 1982 | EF1 | 78 km | 0.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: INGRAHAM (85,437 acres, 1989).
| Year | Name | Acres Burned | Distance |
| 1989 | INGRAHAM | 85,437 | 88 km |
| 2018 | FY 18 COASTAL PRAIRIES | 18,844 | 80 km |
| 2021 | FOUR SIXTEEN | 9,675 | 98 km |
| 2001 | LOPEZ | 8,777 | 95 km |
| 1985 | EASTBNDY | 8,523 | 89 km |
| 2021 | CP3 | 8,143 | 56 km |
| 2011 | CAPE SABLE RX | 7,311 | 56 km |
| 2020 | HID-BUFFER RX | 6,381 | 78 km |
| 1989 | UNNAMED | 6,215 | 73 km |
| 2009 | HELLS BAY | 5,489 | 57 km |
| 2024 | EVER CP3 EXOTICS RX | 5,485 | 57 km |
| 1986 | UNNAMED | 5,417 | 97 km |
| 2008 | CAPE SABLE RX | 5,335 | 55 km |
| 2005 | LYGODIUM LAKE | 5,211 | 82 km |
| 2001 | SQUAWKCRK2 | 4,702 | 78 km |
| 2021 | COASTAL PRAIRIE 1 EXOTICS | 4,549 | 100 km |
| 2005 | BIG LOSTMANS RX | 4,175 | 95 km |
| 2008 | CANE PATCH RX | 3,766 | 79 km |
| 1989 | UNNAMED | 3,563 | 73 km |
| 1986 | PINES WA | 3,447 | 78 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 70°F (21°C) | 1.9 in | |
| February | 70°F (21°C) | 1.7 in | Coldest, Driest |
| March | 73°F (23°C) | 1.7 in | |
| April | 76°F (24°C) | 1.9 in | |
| May | 80°F (26°C) | 4.8 in | |
| June | 82°F (28°C) | 7.2 in | Wettest |
| July | 85°F (30°C) | 3.9 in | Warmest |
| August | 84°F (29°C) | 5.8 in | |
| September | 83°F (28°C) | 6.7 in | |
| October | 80°F (26°C) | 4.9 in | |
| November | 75°F (24°C) | 2.1 in | |
| December | 71°F (22°C) | 1.7 in |
Key Colony Beach has a seasonal temperature swing of 15°F / from 70°F in February to 85°F in July. Total annual precipitation is 44.1 inches, with June being the wettest month (7.2") and February the driest (1.7").