December weather forecast
Key West, FL

A beach pier in Key West, Florida, with palm trees in the background
A beach pier in Key West, Florida, with palm trees in the background

Weather in December

The first month of the winter, December, is also a moderately hot month in Key West, Florida, with an average temperature varying between 72.5°F (22.5°C) and 75.2°F (24°C).

Temperature

In Key West, the average high-temperature in December is almost the same as in November - a still moderately hot 75.2°F (24°C). In Key West, the average low-temperature is 72.5°F (22.5°C).

Humidity

In Key West, the average relative humidity in December is 77%.

Rainfall

In December, in Key West, the rain falls for 13.4 days. Throughout December, 1.22" (31mm) of precipitation is accumulated. Throughout the year, there are 199.2 rainfall days, and 31.61" (803mm) of precipitation is accumulated.

Ocean temperature

In Key West, the average water temperature is 74.5°F (23.6°C).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 74.5°F (23.6°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

The month with the shortest days in Key West is December, with an average of 10h and 39min of daylight.
On the first day of December, sunrise is at 6:54 am and sunset at 5:38 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 5:49 pm EST.

Sunshine

The month with the least sunshine is December, with an average of 6.3h of sunshine.

UV index

The average daily maximum UV index in December in Key West is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 in December transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the average humidity in December in Key West?

The average relative humidity in December in Key West, Florida, is 77%.

How many days does it rain in December in Key West?

In December, the rain falls for 13.4 days. Throughout December, 1.22" (31mm) of precipitation is accumulated.

What is the ocean temperature in December in Key West?

In Key West, the average seawater temperature in December is 74.5°F (23.6°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 74.5°F (23.6°C) water may be enjoyable.

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

With an average of 10h and 39min of daylight, December has the shortest days of the year.

How many hours of daylight does Key West have in December?

In Key West, the average day length in December is 10h and 39min.

What time are sunrise and sunset in December in Key West?

On the first day of December in Key West, Florida, sunrise is at 6:54 am and sunset at 5:38 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 5:49 pm EST.

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

December has the least sunshine of the year in Key West, with an average of 6.3h of sunshine.

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

In December, the average sunshine duration in Key West, Florida, is 6.3h.

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

The average daily maximum UV index in December in Key West is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to Sun's UV rays.

Average temperature in December
Key West, FL

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

The warmest month (with the highest average high temperature) is August (85.3°F).
The month with the lowest average high temperature is January (72.7°F).

  • Average low temperature in December: 72.5°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 (68.5°F).

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Average pressure in December
Key West, FL

Average pressure in December - Key West, FL
  • Average pressure in December: 30.06"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are September and October (29.93"Hg).

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Average wind speed in December
Key West, FL

Average wind speed in December - Key West, FL
  • Average wind speed in December: 13.8mph

The windiest months (with the highest average wind speed) are January and November (14.4mph).
The calmest month (with the lowest average wind speed) is July (9.5mph).

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Average humidity in December
Key West, FL

Average humidity in December - Key West, FL
  • Average humidity in December: 77%

The month with the highest relative humidity is February (78%).
The months with the lowest relative humidity are July, August and September (74%).

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Average rainfall in December
Key West, FL

Average rainfall in December - Key West, FL
  • Average rainfall in December: 1.22"

The wettest month (with the highest rainfall) is September (5.12").
The driest month (with the least rainfall) is March (0.67").

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Average rainfall days in December
Key West, FL

Average rainfall days in December - Key West, FL
  • Average rainfall days in December: 13.4 days

The months with the highest number of rainy days are August and September (23.1 days).
The month with the least rainy days is February (11 days).

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Average sea temperature in December
Key West, FL

Average sea temperature in December - Key West, FL
  • Average sea temperature in December: 74.5°F

The best month for swimming (with the highest average sea temperature) is August (86.9°F).
The coldest months (with the lowest average sea temperature) are January and February (71.2°F).

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

Average daylight in December / Average sunshine in December - Key West, FL
  • Average daylight in December: 10h and 39min

The month with the longest days is June (Average daylight: 13h and 38min).
The month with the shortest days is December (Average daylight: 10h and 39min).

  • Average sunshine in December: 6h and 18min

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 18min).

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Average sunshine days in December
Key West, FL

Average sunshine days in December - Key West, FL
  • Average sunshine days in December: 12.2 days

The month with the most sunshine days is March (17 days).
The month with the least sunshine days is September (4.5 days).

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Average UV index in December
Key West, FL

Average UV index in December - Key West, 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 West, FL

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

The month with the most cloud cover is January (Cloud cover 34).
The month with the least cloud cover is April (Cloud cover 23).

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Average visibility in December
Key West, FL

Average visibility in December - Key West, 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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