Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
With December's advent, Key West sees an average high-temperature of a still warm 75.2°F, subtly shifted from November's 77.9°F. Key West, in December, registers a nighttime average temperature of 72.5°F.Humidity
The average relative humidity in December in Key West is 77%.Rainfall
In December, the rain falls for 13.4 days. Throughout December, 1.22" of precipitation is accumulated. In Key West, Florida, during the entire year, the rain falls for 199.2 days and collects up to 31.61" of precipitation.Ocean temperature
In Key West, the average seawater temperature in December is 74.5°F.Note: While a person's sensitivity to cold is personal, factors like sunshine, wind, and the temperature can influence their comfort in 74.5°F waters. Olympians, for perspective, swim in waters between 77°F and 82.4°F.
Daylight
The month with the shortest days is December, with an average of 10h and 36min of daylight.On the first day of the month, sunrise is at 6:54 am and sunset at 5:38 pm. On the last day of December, sunrise is at 7:10 am and sunset at 5:49 pm EST.
Sunshine
The month with the least sunshine in Key West, Florida, is December, with an average of 6.3h of sunshine.UV index
In December, the average daily maximum UV index in Key West is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.Note: In December, a daily UV index of 6 turns into the following recommendations:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be attentive! The UV exposure is heightened with reflections from sand and water.
FAQ
What are December temperatures in Key West?
What is the average humidity in December in Key West?
How much does it rain in Key West in December?
What is the water temperature in December in Key West?
What is the month with the shortest days in Key West?
What is the average length of the day in December in Key West?
What time are sunrise and sunset in December in Key West?
What is the month with the least sunshine in Key West?
How long on average sun shines in December in Key West?
What is the UV index reading in December in Key West?
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).
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).
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).
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%).
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").
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).
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).
Average daylight in December /
Average sunshine in December
Key West, FL
- Average daylight in December: 10h and 4min
The month with the longest days is June (Average daylight: 13h and 36min).
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 18min).
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).
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).
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).
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).
Key West, Florida, USA
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