December weather forecastBay Harbor Islands, FL

December

Weather in December

December, the first month of the winter in Bay Harbor Islands, is still a warm month, with an average temperature fluctuating between 75.7°F (24.3°C) and 68.4°F (20.2°C).

Temperature

The shift into December reveals an average high-temperature of a still moderately hot 75.7°F (24.3°C), closely mirroring November's climate. Bay Harbor Islands maintains a consistent average nighttime low-temperature of 68.4°F (20.2°C) throughout December.

Humidity

The most humid month is December, with an average relative humidity of 75%.

Rainfall

In Bay Harbor Islands, in December, it is raining for 8.6 days, with typically 0.51" (13mm) of accumulated precipitation. Throughout the year, there are 157 rainfall days, and 11.34" (288mm) of precipitation is accumulated.

Snowfall

January through August, October through December are months without snowfall in Bay Harbor Islands.

Ocean temperature

In December, the average ocean temperature is 76.5°F (24.7°C).
Note: Considering one's resistance to cold, elements like sunshine, wind, and the prevailing temperature matter when taking a swim in 76.5°F (24.7°C) waters. (For comparison, the Olympic swimming standard is set between 77°F (25°C) and 82.4°F (28°C).)

Daylight

The month with the shortest days in Bay Harbor Islands is December, with an average of 10h and 36min of daylight.
On the first day of the month, sunrise is at 6:50 am and sunset at 5:28 pm. On the last day of December, in Bay Harbor Islands, sunrise is at 7:07 am and sunset at 5:40 pm EST.

Sunshine

With an average of 6.3h of sunshine, December has the least sunshine of the year.

UV index

The average daily maximum UV index in December in Bay Harbor Islands is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 6 during December translates into the following guidance:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Take warning! Reflective sand and water surfaces intensify the Sun's UV rays.

Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Bay Harbor Islands in December has an average high-temperature of 75.7°F (24.3°C) and an average low-temperature of 68.4°F (20.2°C). In October, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is appraised at 89.6°F (32°C).

December is the most humid month in Bay Harbor Islands, with an average relative humidity of 75%.

In Bay Harbor Islands, Florida, the average relative humidity in December is 75%.

In Bay Harbor Islands, in December, during 8.6 rainfall days, 0.51" (13mm) of precipitation is typically accumulated.

January through August, October through December are months without snowfall in Bay Harbor Islands, Florida.

In Bay Harbor Islands, the average seawater temperature in December is 76.5°F (24.7°C). For individuals prone to feeling cold, swimming in 73.4°F (23°C) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 76.5°F (24.7°C).

With an average of 10h and 36min of daylight, December has the shortest days of the year in Bay Harbor Islands.

The average day length in December in Bay Harbor Islands is 10h and 33min.

On the first day of December, sunrise is at 6:50 am and sunset at 5:28 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 5:40 pm EST.

The month with the least sunshine in Bay Harbor Islands, Florida, is December, with an average of 6.3h of sunshine.

The average sunshine duration in December in Bay Harbor Islands, Florida, is 6.3h.

In December, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

78.4°F

75.7°F

73°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

11.4mph

11.1mph

11.6mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

9.7

8.6

7.3

Average snowfall

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

14.9

19.5

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Bay Harbor Islands, FL

Average high temperature in December: 75.7°F

The warmest month (with the highest average high temperature) is August (87.6°F).
The month with the lowest average high temperature is January (73°F).

Average low temperature in December: 68.4°F

The month with the highest average low temperature is August (82°F).
The coldest month (with the lowest average low temperature) is January (64°F).

Average pressure in December
Bay Harbor Islands, 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
Bay Harbor Islands, FL

Average wind speed in December: 10.4mph

The windiest month (with the highest average wind speed) is March (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).

Average humidity in December
Bay Harbor Islands, 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 (69%).

Average rainfall in December
Bay Harbor Islands, FL

Average rainfall in December: 0.51"

The wettest month (with the highest rainfall) is August (1.97").
The driest month (with the least rainfall) is January (0.31").

Average rainfall days in December
Bay Harbor Islands, FL

Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is September (21.7 days).
The month with the least rainy days is February (6.8 days).

Average snowfall in December
Bay Harbor Islands, FL

Average snowfall in December: 0"

The month with the highest snowfall is September (0.04").
The months with the least snowfall are January, February, March, April, May, June, July, August, October, November and December (0").

Average snowfall days in December
Bay Harbor Islands, FL

Average snowfall days in December: 0 days

The month with the highest number of snowfall days is September (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).

Average sea temperature in December
Bay Harbor Islands, 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
Bay Harbor Islands, 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 18min

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
Bay Harbor Islands, FL

Average sunshine days in December: 17 days

The month with the most sunshine days is March (20.3 days).
The month with the least sunshine days is September (4.4 days).

Average UV index in December
Bay Harbor Islands, FL

Average UV index in December: 6

The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 5).

Average cloud cover in December
Bay Harbor Islands, 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 27).

Average visibility in December
Bay Harbor Islands, 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).