December weather forecastIslamorada, FL
December
Weather in December
December, the first month of the winter in Islamorada, is still a warm month, with an average temperature fluctuating between 75.2°F (24°C) and 71.1°F (21.7°C).Temperature
The average high-temperature in December, at a still moderately hot 75.2°F (24°C), reveals a modest deviation from November's 77.7°F (25.4°C). December nights experience a minor temperature downturn to a pleasant 71.1°F (21.7°C).Humidity
February, June and December, with an average relative humidity of 76%, are the most humid months.Rainfall
In Islamorada, in December, during 12.5 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. Throughout the year, there are 190.1 rainfall days, and 27.05" (687mm) of precipitation is accumulated.Ocean temperature
In Islamorada, the average seawater temperature in December is 76.5°F (24.7°C).Note: For someone not comfortable with cold, swimming in 76.5°F (24.7°C) waters might be a stretch. However, with favorable conditions like abundant sunshine, mild wind, and warm air temperatures, the experience can be improved. And while wetsuits are not a must, they can be considered.
Daylight
With an average of 10h and 36min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:50 am and sunset at 5:32 pm. On the last day of December, sunrise is at 7:07 am and sunset at 5:44 pm EST.
Sunshine
December has the least sunshine of the year in Islamorada, with an average of 6.4h of sunshine.UV index
The average daily maximum UV index in December is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the average person.Note: In December, the maximum UV index of 6 translates into these guidelines:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. To cut down UV radiation exposure by about half, sport a wide-brim hat. Be on guard! The reflective nature of sand and water boosts UV exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Islamorada, 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).
Average pressure in December
Islamorada, 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).
Average wind speed in December
Islamorada, 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).
Average humidity in December
Islamorada, 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%).
Average rainfall in December
Islamorada, 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").
Average rainfall days in December
Islamorada, 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).
Average sea temperature in December
Islamorada, FL
- Average sea temperature in December: 76.5°F
The best month for swimming (with the highest average sea temperature) is August (86.6°F).
The coldest months (with the lowest average sea temperature) are January and February (73.9°F).
Average daylight in December /
Average sunshine in December
Islamorada, FL
- Average daylight in December: 10h and 36min
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 24min
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).
Average sunshine days in December
Islamorada, 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).
Average UV index in December
Islamorada, 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
Islamorada, 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).
Average visibility in December
Islamorada, 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).
