December weather forecastKey Biscayne, FL
December
Weather in December
The first month of the winter, December, is also a moderately hot month in Key Biscayne, Florida, with an average temperature ranging between min 69.4°F (20.8°C) and max 75.7°F (24.3°C).Temperature
The transition from November to December sees average high-temperatures adjusting to a still warm 75.7°F (24.3°C), from a not significantly different 77.9°F (25.5°C). Key Biscayne maintains an average of approximately an agreeable 69.4°F (20.8°C) during December nights, with only a minimal decrease from the daytime temperature.Humidity
The most humid month is December, with an average relative humidity of 75%.Rainfall
In Key Biscayne, in December, during 11.7 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. In Key Biscayne, during the entire year, the rain falls for 182.7 days and collects up to 16.38" (416mm) of precipitation.Ocean temperature
In December, the average ocean temperature is 76.5°F (24.7°C).Note: Every individual's cold threshold differs, but factors like today's sunshine, wind, and temperature can tip the scales for a delightful swim in 76.5°F (24.7°C) waters. For reference, Olympians swim in waters of 77°F (25°C) to 82.4°F (28°C).
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 5:29 pm. On the last day of December, sunrise is at 7:06 am and sunset at 5:40 pm EST.
Sunshine
December has the least sunshine of the year, with an average of 6.4h of sunshine.UV index
January and December, with an average maximum UV index of 5, are months with the lowest UV index in Key Biscayne, Florida. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum UV index of 5 in December translates into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Always opt for UVA and UVB-resistant sunglasses on radiant days. Beware! Reflections from sand and water can intensify the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Key Biscayne, FL
- Average high temperature in December: 75.7°F
The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is January (73°F).
- Average low temperature in December: 69.4°F
The month with the highest average low temperature is August (82.6°F).
The coldest month (with the lowest average low temperature) is January (65.1°F).
Average pressure in December
Key Biscayne, FL
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are September and October (29.95"Hg).
Average wind speed in December
Key Biscayne, FL
- Average wind speed in December: 11.1mph
The windiest month (with the highest average wind speed) is March (11.6mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).
Average humidity in December
Key Biscayne, FL
- Average humidity in December: 75%
The month with the highest relative humidity is December (75%).
The month with the lowest relative humidity is March (70%).
Average rainfall in December
Key Biscayne, FL
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is August (2.8").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in December
Key Biscayne, FL
- Average rainfall days in December: 11.7 days
The month with the highest number of rainy days is September (24.5 days).
The month with the least rainy days is February (8.7 days).
Average sea temperature in December
Key Biscayne, FL
- Average sea temperature in December: 76.4°F
The best month for swimming (with the highest average sea temperature) is August (86.5°F).
The coldest month (with the lowest average sea temperature) is February (74°F).
Average daylight in December /
Average sunshine in December
Key Biscayne, 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 6min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in December
Key Biscayne, FL
- Average sunshine days in December: 14.5 days
The month with the most sunshine days is March (17 days).
The month with the least sunshine days is September (3.2 days).
Average UV index in December
Key Biscayne, FL
- Average UV index in December: 5
The months with the highest UV index are May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January and December (UV index 5).
Average cloud cover in December
Key Biscayne, FL
- Average cloud cover in December: 32
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
Key Biscayne, 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).
