Key West Weather in December

Warm and mainly sunny describes December's delightful weather for Key West, Florida.

This page gives detailed information on the typical December temperature, precipitation, sun, humidity, wind and storms for Key West. The numbers here are historical averages based on climate data gathered at the Key West International Airport, located on Key West Island.

Temperature Weather iconTemperature

78 °F December average high 25 °C
68 °F December average low 20 °C
13 days 80 °F max. or more (27 °C)
19 days 70 °F min. or less (21 °C)

Nearly every December day warms to over 70 degrees Fahrenheit (21 degrees Celsius) in Key West. Temperatures above 90 °F (32 °C) are not expected here this month.

The thermometer dips to 60 °F (16 °C) or below on an average of four nights. Most years December does not get as cold as 50 °F (10 °C).

Rainy Weather iconRain

2.2 in total precipitation 55 mm
6 days of rain

Half the time, Key West receives 0.8 to 3.4 inches (20 to 86 mm) of rainfall in December. One in four years has drier weather, while another one in four is wetter.

Sunny Weather iconSun

70 % sunshine
11 days clear skies

The sun's rays reach the ground in Key West during 70 percent of daylight hours on average in December, for a total of 231 hours in the month. Typically on 11 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in December at Key West averages 10 hours and 38 minutes a day. The shortest days of the year, from around December 16th to 26th, last 10 hours and 37 minutes from sunrise to sunset.

Humid Weather iconHumidity

76 % December average humidity

The relative humidity in Key West during December usually peaks at 82 percent in the morning then drops to 69 percent by early afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 80 81 82 74 69 70 76 78

Windy Weather iconWind

11.7 mph December wind speed average 18.8 kph

December is windier than most other months in Key West.

Stormy Weather iconStorms

1 day rainfall of 0.5 inches (13 mm) or more
1 day with thunderstorms in December

The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.

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