Duck Key, Florida climate: Normal weather by month, frost dates and records
Duck Key's normal year runs from 63°F January nights to 89°F August afternoons, with 40.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 25.3°C, January lows of 17°C, August highs of 32°C, 1,026 mm of precipitation a year.
- NOAA stationDuck Key
- Station IDUSC00082441
- Location24.77°N 80.91°W
- Elevation4 ft (1 m)
- Population (census place)755
On October 10, the normal high in Duck Key is 86°F and the normal low 77°F, and the chance of measurable rain or snow is 35%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Duck Key.
- Jan 75° 63°
- Feb 77° 65°
- Mar 79° 68°
- Apr 82° 72°
- May 85° 75°
- Jun 88° 78°
- Jul 89° 79°
- Aug 89° 79°
- Sep 88° 78°
- Oct 84° 76°
- Nov 79° 70°
- Dec 77° 67°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Duck Key each month?
August is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 63°F. The most precipitation falls in September (6.10 in), the least in January (1.62 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 75°F | 63°F | 69.0°F | 1.62 | 6 | <1 | <1 | 10 h 50 min |
| February | 77°F | 65°F | 70.9°F | 1.86 | 5 | <1 | <1 | 11 h 20 min |
| March | 79°F | 68°F | 73.4°F | 1.76 | 4 | <1 | <1 | 12 h |
| April | 82°F | 72°F | 76.8°F | 1.79 | 4 | <1 | <1 | 12 h 40 min |
| May | 85°F | 75°F | 79.9°F | 2.74 | 5 | 1 | <1 | 13 h 20 min |
| June | 88°F | 78°F | 82.9°F | 5.06 | 10 | 6 | <1 | 13 h 40 min |
| July | 89°F | 79°F | 84.1°F | 3.64 | 11 | 14 | <1 | 13 h 30 min |
| August | 89°F | 79°F | 84.4°F | 5.74 | 11 | 17 | <1 | 13 h |
| September | 88°F | 78°F | 82.8°F | 6.10 | 13 | 8 | <1 | 12 h 20 min |
| October | 84°F | 76°F | 79.9°F | 5.98 | 10 | 1 | <1 | 11 h 40 min |
| November | 79°F | 70°F | 74.7°F | 2.35 | 6 | <1 | <1 | 11 h |
| December | 77°F | 67°F | 71.6°F | 1.74 | 7 | <1 | <1 | 10 h 40 min |
| Year (annual) | 83°F | 73°F | 77.5°F | 40.38 | 90 | 46 | <1 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 24°C | 17°C | 20.6°C | 41 mm |
| February | 25°C | 18°C | 21.6°C | 47 mm |
| March | 26°C | 20°C | 23.0°C | 45 mm |
| April | 28°C | 22°C | 24.9°C | 45 mm |
| May | 29°C | 24°C | 26.6°C | 70 mm |
| June | 31°C | 26°C | 28.3°C | 129 mm |
| July | 32°C | 26°C | 28.9°C | 92 mm |
| August | 32°C | 26°C | 29.1°C | 146 mm |
| September | 31°C | 25°C | 28.2°C | 155 mm |
| October | 29°C | 24°C | 26.6°C | 152 mm |
| November | 26°C | 21°C | 23.7°C | 60 mm |
| December | 25°C | 19°C | 22.0°C | 44 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00082441; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Duck Key?
Normal highs sit between 65°F and 85°F in January, February, March, April, May, October, November and December. Of those, April has the fewest days with rain (4).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00082441.
How hot and how cold does it get in Duck Key?
In a normal year in Duck Key, 46 days a year reach 90°F, nights almost never fall to freezing and 90 days bring measurable precipitation.
- Days at 90°F or more
- 46a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- fewer than 1a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 90a normal year
The highest temperature in this station's record (since 1982) is 99°F, on July 15, 1987; the lowest is 37°F, on December 25, 1989.
The wettest calendar year on that record is 1983, with 63.23 in.
Source: NOAA NCEI 1991-2020 annual normals, station USC00082441; records: ACIS (NOAA Regional Climate Centers), station USC00082441. Records use complete months only; a month missing more than three days is left out.
How sunny is Duck Key?
Over a year 85% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Duck Key, 5.4 kWh per square metre a day. April is the sunniest month (90%) and January the cloudiest (82%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 82% | 3.9 |
| February | 85% | 4.8 |
| March | 88% | 5.8 |
| April | 90% | 6.6 |
| May | 87% | 6.6 |
| June | 83% | 6.3 |
| July | 86% | 6.4 |
| August | 86% | 6.2 |
| September | 83% | 5.5 |
| October | 83% | 4.8 |
| November | 83% | 4.1 |
| December | 82% | 3.6 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Duck Key need?
A normal year in Duck Key brings 85 heating degree days, 98% fewer than the median U.S. place (5,373), and 4,672 cooling degree days, 5.1 times the median (908). No month reaches 300 heating degree days. For gardens and crops, NOAA counts 10,063 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 39 | 162 |
| February | 18 | 184 |
| March | 6 | 266 |
| April | 0 | 354 |
| May | 0 | 463 |
| June | 0 | 536 |
| July | 0 | 594 |
| August | 0 | 601 |
| September | 0 | 534 |
| October | 0 | 464 |
| November | 2 | 293 |
| December | 19 | 222 |
| Year (annual) | 85 | 4,672 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00082441. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Duck Key's climate compare?
Duck Key is warmer than 102 of the other 105 places with their own NOAA record in Florida, and wetter than 1. Across the 7,247 U.S. stations with normals, its annual mean of 77.5°F is warmer than 100%.
In the Köppen classification computed from these normals, Duck Key is Aw: tropical savanna. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Duck Key share this climate record?
Layton has no NOAA station with 1991-2020 normals of its own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Layton, FL208 people · 7 mi NE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Duck Key's climate
What is the coldest month in Duck Key?
January, with a normal high of 75°F and a normal low of 63°F. The warmest is August (89°F by day, 79°F at night).
Does it snow in Duck Key?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Duck Key?
September, with 6.10 in of precipitation in a normal year; the driest is January with 1.62 in.
What plant hardiness zone is Duck Key in?
The USDA's 2023 map puts Duck Key in zone 11b in ZIP code 33050, the nearest ZIP area. By the same method at Duck Key's NOAA station, the coldest night of a typical year reaches 47°F (26 years, 1991-2020): zone 11b.
Nearby and next
- Florida climateThe statewide normals and every place in the state
- Curry Hammock State Park, FL5 miles from this station, 77.8°F a year
- Marathon, FL9 miles from this station, 78.8°F a year
- Islamorada, FL20 miles from this station, 77.9°F a year
- Bahia Honda State Park, FL25 miles from this station, 77.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made