December weather forecast
Key Largo, FL

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A clear seascape and cloudy evening sky in Key Largo, Florida
A clear seascape and cloudy evening sky in Key Largo, Florida

Weather in December

December represents the coolest month in Key Largo, illustrating a stark contrast in temperature compared to November. Lesser rainfall and limited daylight hours define the city’s weather in this month. The island city lapses into a serene and less crowded phase, making it an ideal time for those seeking tranquility. However, even in its coldest month, the sea remains warm enough for swimming. This month, the highest temperature records 75.2°F (24°C), with rainfall reduced to just 0.91" (23mm).

Temperature

Key Largo's weather in December displays an average high-temperature of a still moderately hot 75.2°F (24°C), showing minor disparity from November's 77.7°F (25.4°C). Key Largo records a slight downturn in temperature to an average of 71.1°F (21.7°C) during December nights.

Humidity

The months with the highest humidity in Key Largo are February, June and December, with an average relative humidity of 76%.

Rainfall

In Key Largo, in December, it is raining for 12.5 days, with typically 0.91" (23mm) of accumulated precipitation. In Key Largo, during the entire year, the rain falls for 190.1 days and collects up to 27.05" (687mm) of precipitation.

Ocean temperature

In December, the average ocean temperature is 76.3°F (24.6°C).
Note: For those not fond of cold temperatures, taking a swim at 76.3°F (24.6°C) may require consideration of the sunshine, wind, and ambient temperature. While wetsuits are not mandatory, they can enhance the experience.

Daylight

December has the shortest days of the year, with an average of 10h and 36min of daylight.
On the first day of December in Key Largo, sunrise is at 6:50 am and sunset at 5:31 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:43 pm EST.

Sunshine

The month with the least sunshine is December, with an average of 6.4h of sunshine.

UV index

In Key Largo, the average daily maximum UV index in December is 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the average person.
Note: The maximum UV index of 6 during December translates into these guidelines:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Alert! Sand and water increase UV exposure due to their reflective properties.
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Frequently asked questions

What are the temperatures in Key Largo in December?

Key Largo in December has an average high-temperature of 75.2°F (24°C) and an average low-temperature of 71.1°F (21.7°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in October is estimated at 87.8°F (31°C).

What is the most humid month in Key Largo?

February, June and December, with an average relative humidity of 76%, are most humid months.

What is the average humidity in December in Key Largo?

In Key Largo, Florida, the average relative humidity in December is 76%.

How much does it rain in Key Largo in December?

In Key Largo, Florida, during December, the rain falls for 12.5 days and regularly aggregates up to 0.91" (23mm) of precipitation.

What is the ocean temperature in December in Key Largo?

In Key Largo, Florida, the average seawater temperature in December is 76.3°F (24.6°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 76.3°F (24.6°C) water may be enjoyable.

What is the month with the shortest days in Key Largo?

With an average of 10h and 36min of daylight, December has the shortest days of the year in Key Largo, Florida.

What is the average length of the day in December in Key Largo?

The average day length in December is 10h and 37min.

When are sunrise and sunset in December in Key Largo?

In December, on the first day of the month, sunrise is at 6:50 am and sunset at 5:31 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:43 pm EST.

What is the month with the least sunshine in Key Largo?

December has the least sunshine of the year in Key Largo, Florida, with an average of 6.4h of sunshine.

How long on average sun shines in December in Key Largo?

In Key Largo, Florida, the average sunshine duration in December is 6.4h.

What is the UV index reading in December in Key Largo?

The average daily maximum UV index in December in Key Largo, Florida, is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in December
Key Largo, FL

Average temperature in December - Key Largo, FL
  • Average high temperature in December: 75.2°F

The warmest month (with the highest average high temperature) is August (85.5°F).
The month with the lowest average high temperature is January (72.7°F).

  • Average low temperature in December: 71.1°F

The month with the highest average low temperature is August (82.9°F).
The coldest month (with the lowest average low temperature) is January (66.9°F).

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Average pressure in December
Key Largo, FL

Average pressure in December - Key Largo, FL
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are September and October (29.94"Hg).

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Average wind speed in December
Key Largo, FL

Average wind speed in December - Key Largo, FL
  • Average wind speed in December: 12.4mph

The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is July (8.9mph).

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Average humidity in December
Key Largo, FL

Average humidity in December - Key Largo, FL
  • Average humidity in December: 76%

The months with the highest relative humidity are February, June and December (76%).
The month with the lowest relative humidity is March (73%).

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Average rainfall in December
Key Largo, FL

Average rainfall in December - Key Largo, FL
  • Average rainfall in December: 0.91"

The wettest month (with the highest rainfall) is August (4.33").
The driest month (with the least rainfall) is March (0.59").

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Average rainfall days in December
Key Largo, FL

Average rainfall days in December - Key Largo, FL
  • Average rainfall days in December: 12.5 days

The month with the highest number of rainy days is September (22.9 days).
The month with the least rainy days is February (9.7 days).

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Average sea temperature in December
Key Largo, FL

Average sea temperature in December - Key Largo, FL
  • Average sea temperature in December: 76.3°F

The best month for swimming (with the highest average sea temperature) is August (86.5°F).
The coldest month (with the lowest average sea temperature) is February (74°F).

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Average daylight in December /
Average sunshine in December
Key Largo, FL

Average daylight in December / Average sunshine in December - Key Largo, FL
  • Average daylight in December: 10h and 4min

The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 36min).

  • Average sunshine in December: 6h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).

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Average sunshine days in December
Key Largo, FL

Average sunshine days in December - Key Largo, FL
  • Average sunshine days in December: 14.9 days

The month with the most sunshine days is January (17.3 days).
The month with the least sunshine days is September (5.2 days).

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Average UV index in December
Key Largo, FL

Average UV index in December - Key Largo, FL
  • Average UV index in December: 6

The months with the highest UV index are April, May, June, July, August, September and October (UV index 7).
The month with the lowest UV index is January (UV index 5).

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Average cloud cover in December
Key Largo, FL

Average cloud cover in December - Key Largo, FL
  • Average cloud cover in December: 33

The month with the most cloud cover is October (Cloud cover 35).
The month with the least cloud cover is April (Cloud cover 26).

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Average visibility in December
Key Largo, FL

Average visibility in December - Key Largo, FL
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Key Largo, Florida, USA

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