Photo: Florida Keys--Public Libraries from Key West, Fla., USA · CC BY 2.0Key Colony Beach sits near the top of U.S. towns for mild winters
Peak summer warmth arrives in July, with afternoons near 90°. In July, afternoons here are warmer than in 78% of U.S. towns. Since 1901–2000, the year has warmed by 1.8°, most of all in December. Picnics, hikes and garden evenings come into their own from November to April, with highs of 76–83°.
A year in Key Colony Beach at a glance
Each month’s typical high and low, and what it brings.
What stands out about Key Colony Beach’s climate
Compared with towns across the U.S., with Key Colony Beach’s place in Florida beside it.
What a year in Key Colony Beach feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Frost is rare
Frost and day counts come from NOAA’s station at Marathon Airport, 1.9 miles from the town’s center, at about the same height.
The 2023 USDA map puts Key Colony Beach’s center in zone 11b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 48°. Plant labels use the zone; frost dates tell you when to plant.
90° days by month
Average days at 90° or more
About 42 inches of rain a year
September is the wettest month and February the driest. Rain falls on about 90 days a year. Snow is rare: about 0.0" in a normal year at Duck Key, FL, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Key Colony Beach
1% of the work is heating, so air conditioning is the bigger bill. No month averages under 55°.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Marathon Airport.
Living with Key Colony Beach’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 11b. Frost almost never comes, so tender plants can often stay out through winter.
Months with highs of 62–84° and lows of 40° or more: January, February, March, April, November and December. 0.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Key Colony Beach from natural hazards, hurricanes are the largest share (73%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Key Colony Beach and similar climates
TownRatings has no climate map of the towns around Key Colony Beach yet.
Climates most like Key Colony Beach’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Key Colony Beach, FL | 64° | 90° | 42" | 0.0" |
| Waimanalo, HI | 65° | 84° | 42" | 0.0" |
| Corpus Christi, TX | 49° | 91° | 34" | 0.0" |
| St. Simons, GA | 43° | 91° | 49" | 0.0" |
| Hilton Head Island, SC | 41° | 90° | 49" | 0.0" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Key Colony Beach averaged 1.8° warmer than the 1900s. The biggest change is in December (+2.6°).
A bigger shift than in 77% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Key Colony Beach compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Key Colony Beach’s place among Florida’s.
Key Colony Beach weather by month
Highs, lows and precipitation from NOAA’s grid at Key Colony Beach’s center; snow, wet days and snow on the ground from Duck Key, FL. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 76° | 64° | 1.9" | 0.0" | 6 | 0 | 63° – 74° |
| February | 78° | 65° | 1.6" | 0.0" | 5 | 0 | 65° – 77° |
| March | 80° | 67° | 1.9" | 0.0" | 4 | 0 | 68° – 79° |
| April | 83° | 71° | 2.2" | 0.0" | 4 | 0 | 74° – 81° |
| May | 86° | 74° | 3.9" | 0.0" | 5 | 0 | 77° – 83° |
| June | 89° | 78° | 5.1" | 0.0" | 10 | 0 | 81° – 86° |
| July | 90° | 79° | 3.9" | 0.0" | 11 | 0 | 82° – 86° |
| August | 90° | 79° | 5.3" | 0.0" | 11 | 0 | 83° – 87° |
| September | 89° | 78° | 6.8" | 0.0" | 13 | 0 | 82° – 85° |
| October | 85° | 75° | 5.4" | 0.0" | 10 | 0 | 78° – 83° |
| November | 81° | 71° | 2.2" | 0.0" | 6 | 0 | 72° – 81° |
| December | 78° | 67° | 2.0" | 0.0" | 7 | 0 | 62° – 79° |
| Year | 84° | 72° | 42.2" | 0.0" | 90 | 0 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 62° to 79°. September is the most reliable, staying within 4°.
Where Key Colony Beach’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Key Colony Beach’s center.
- Snow: Duck Key, FL.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Marathon Airport, 1.9 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Key Colony Beach’s climate
What is the weather like in Key Colony Beach?
A typical July afternoon reaches 90°, a January night drops to 64°, and snow is almost unheard of. Milder January nights than all but 67 U.S. towns; hotter July afternoons than 78% of U.S. towns.
How cold does it get in Key Colony Beach in winter?
January nights average 64°. A night at 32° or below comes in only some winters (0.0 a year on average). In the coldest January of the last 30 years the month averaged 63°.
How much snow does Key Colony Beach get?
About 0.0 inches in a normal winter at Duck Key, FL, so most winters see none.
How hot does it get in Key Colony Beach?
July, with a typical high of 90° and a low of 79°. About 105 days a year reach 90° (Marathon Airport).
When is the first and last frost in Key Colony Beach?
Most years have no frost at all: a 32° night comes in about 0% of winters at Marathon Airport, usually in December or January.
What growing zone is Key Colony Beach in?
Zone 11b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 48°.
What is the best time of year to visit Key Colony Beach?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, April, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Key Colony Beach getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 77% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Key Colony Beach.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.