Key West
Florida, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and Climate
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
December is a month in the dry season and is the onset of the mild winter. The average temperatures are in the high 60°F (15.6°C) and 70°F (21.1°C) with a few rainy days.
Key West enjoys an influx of visitors who do not mind paying a high price for fantastic weather compared to the rest of the United States during the winter. The picturesque turquoise water in the serene surroundings makes it one of the best tourist places with an abundance of sunshine hours in December.
  • The average high temperature in December: 24.4°C

The warmest month (with the highest average high temperature) is August (31.9°C).
The month with the lowest average high temperature is January (23.5°C).

  • The average low temperature in December: 19.4°C

The month with the highest average low temperature is July (26.6°C).
The coldest month (with the lowest average low temperature) is January (17.9°C).

  • The average humidity in December: 76.2%

The month with the highest relative humidity is December (76.2%).
The month with the lowest relative humidity is April (70.1%).

  • The average rainfall in December: 45mm

The wettest month (with the highest rainfall) is September (166mm).
The driest month (with the lowest rainfall) is March (40mm).

  • The average rainfall days in December: 6.4 days

The month with the highest number of rainy days is September (16.2 days).
The month with the lowest number of rainy days is April (4.5 days).

  • The average sea temperature in December: 23.6°C

The best month for swimming (with the highest average sea temperature) is August (30.5°C).
Coldest months (with the lowest average sea temperature) are January and February (21.8°C).

  • The average daylight in December: 11h

The month with the longest days is June (Average daylight: 14h).
Months with shortest days are January, February, November and December (Average daylight: 11h).

  • The average sunshine in December: 7.6h

The month with most sunshine is May (Average sunshine: 11h).
The month with least sunshine is December (Average sunshine: 7.6h).

  • The average UV index in December: 6

Months with the highest UV index are April, May, June, July and August (UV index 11).
Months with the lowest UV index are January and December (UV index 6).

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