December weather forecast
Siesta Key, FL

Weather in December

The first month of the winter, December, is still a pleasant month in Siesta Key, Florida, with an average temperature varying between 60.8°F (16°C) and 72.5°F (22.5°C).

Temperature

In December, the average high-temperature is relatively the same as in November - a pleasant 72.5°F (22.5°C). The average low-temperature, in Siesta Key, is 60.8°F (16°C).

Humidity

With an average relative humidity of 76%, December is the most humid month in Siesta Key, Florida.

Rainfall

In Siesta Key, in December, it is raining for 9.3 days, with typically 1.97" (50mm) of accumulated precipitation. In Siesta Key, during the entire year, the rain falls for 183.1 days and collects up to 34.92" (887mm) of precipitation.

Ocean temperature

In Siesta Key, Florida, the average water temperature is 69.3°F (20.7°C).
Note: For swimming, a surface water temperature of 69.3°F (20.7°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

December has the shortest days of the year in Siesta Key, with an average of 10h and 28min of daylight.
On the first day of the month, sunrise is at 7:02 am and sunset at 5:35 pm. On the last day of December, sunrise is at 7:19 am and sunset at 5:46 pm EST.

Sunshine

The month with the least sunshine in Siesta Key, Florida, is December, with an average of 6.5h of sunshine.

UV index

In Siesta Key, the average daily maximum UV index in December is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 5 in December interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the most humid month in Siesta Key?

December is the most humid month, with an average relative humidity of 76%.

What is the average humidity in December in Siesta Key?

The average relative humidity in December in Siesta Key, Florida, is 76%.

How much does it rain in Siesta Key in December?

In December, the rain falls for 9.3 days. Throughout December, 1.97" (50mm) of precipitation is accumulated.

How cold is the water in December in Siesta Key?

In Siesta Key, Florida, the average seawater temperature in December is 69.3°F (20.7°C). Swimming in 69.3°F (20.7°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

What is the month with the shortest days in Siesta Key?

With an average of 10h and 28min of daylight, December has the shortest days of the year in Siesta Key, Florida.

How many hours of daylight does Siesta Key have in December?

The average day length in December in Siesta Key, Florida, is 10h and 28min.

When are sunrise and sunset in December in Siesta Key?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 5:35 pm. On the last day of the month, in Siesta Key, sunrise is at 7:19 am and sunset at 5:46 pm EST.

What is the month with the least sunshine in Siesta Key?

The month with the least sunshine is December, with an average of 6.5h of sunshine.

How many hours of sunshine does Siesta Key have in December?

In December, the average sunshine duration is 6.5h.

What is the UV index intensity in December in Siesta Key?

In Siesta Key, the average daily maximum UV index in December is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.

Average temperature in December
Siesta Key, FL

Average temperature in December - Siesta Key, FL
  • Average high temperature in December: 72.5°F

The warmest month (with the highest average high temperature) is August (88.5°F).
The month with the lowest average high temperature is January (68.5°F).

  • Average low temperature in December: 60.8°F

The month with the highest average low temperature is August (79.7°F).
The coldest month (with the lowest average low temperature) is January (56.1°F).

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Average pressure in December
Siesta Key, FL

Average pressure in December - Siesta Key, FL
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.95"Hg).

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Average wind speed in December
Siesta Key, FL

Average wind speed in December - Siesta Key, FL
  • Average wind speed in December: 8.9mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).

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Average humidity in December
Siesta Key, FL

Average humidity in December - Siesta Key, FL
  • Average humidity in December: 76%

The month with the highest relative humidity is December (76%).
The months with the lowest relative humidity are March, April and May (72%).

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Average rainfall in December
Siesta Key, FL

Average rainfall in December - Siesta Key, FL
  • Average rainfall in December: 1.97"

The wettest month (with the highest rainfall) is August (6.42").
The driest months (with the least rainfall) are February and November (1.06").

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Average rainfall days in December
Siesta Key, FL

Average rainfall days in December - Siesta Key, FL
  • Average rainfall days in December: 9.3 days

The month with the highest number of rainy days is August (26.8 days).
The months with the least rainy days are January, February and November (8.3 days).

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Average sea temperature in December
Siesta Key, FL

Average sea temperature in December - Siesta Key, FL
  • Average sea temperature in December: 69.2°F

The best month for swimming (with the highest average sea temperature) is August (86.7°F).
The coldest month (with the lowest average sea temperature) is January (64.1°F).

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Average daylight in December /
Average sunshine in December
Siesta Key, FL

Average daylight in December / Average sunshine in December - Siesta Key, FL
  • Average daylight in December: 10h and 28min

The month with the longest days is June (Average daylight: 13h and 50min).
The month with the shortest days is December (Average daylight: 10h and 28min).

  • Average sunshine in December: 6h and 30min

The month with the most sunshine is May (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).

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Average sunshine days in December
Siesta Key, FL

Average sunshine days in December - Siesta Key, FL
  • Average sunshine days in December: 18.9 days

The month with the most sunshine days is January (21.1 days).
The month with the least sunshine days is August (2.5 days).

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Average UV index in December
Siesta Key, FL

Average UV index in December - Siesta Key, FL
  • Average UV index in December: 5

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 4).

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Average cloud cover in December
Siesta Key, FL

Average cloud cover in December - Siesta Key, FL
  • Average cloud cover in December: 30

The months with the most cloud cover are January and December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 22).

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Average visibility in December
Siesta Key, FL

Average visibility in December - Siesta Key, 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).

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