December weather forecastPort Saint Lucie, FL
December
Weather in December
December in Port Saint Lucie ushers in the winter season with a sizeable drop in temperature and sea temperatures reaching a lower 75.6°F (24.2°C). While the days are cooler, they are also less humid, and cumulatively conditions offer a comfortable climate relative to the hotter months. Despite these changes, December weather continues to encourage people to engage in numerous recreational activities, both indoor and outdoor. Notwithstanding a higher cloud coverage than previous months, December maintains a welcoming atmosphere with extended hours of sunlight. As the year closes, weather becomes gradually cooler, establishing the conditions for a temperate January.Temperature
Port Saint Lucie's average high-temperature in December is a still warm 74.3°F (23.5°C), indicating a subtle variation from November. Throughout December, the average low-temperature records at a refreshing 63.9°F (17.7°C).Humidity
In Port Saint Lucie, Florida, the average relative humidity in December is 77%.Rainfall
In Port Saint Lucie, in December, during 10.9 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. In Port Saint Lucie, Florida, during the entire year, the rain falls for 181.5 days and collects up to 18.11" (460mm) of precipitation.Ocean temperature
In Port Saint Lucie, Florida, the average seawater temperature in December is 75.6°F (24.2°C).Note: Think about diving into 75.6°F (24.2°C) waters. Factors like your sensitivity to cold, the brightness of the sun, wind conditions, and the day's warmth play a role. For reference, Olympic swimming competitions use waters between 77°F (25°C) and 82.4°F (28°C).
Daylight
The month with the shortest days in Port Saint Lucie, Florida, is December, with an average of 10h and 30min of daylight.On the first day of the month, sunrise is at 6:54 am and sunset at 5:26 pm. On the last day of December, sunrise is at 7:11 am and sunset at 5:38 pm EST.
Sunshine
January and December, with an average of 6.1h of sunshine, are months with the least sunshine in Port Saint Lucie.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In December, the maximum UV index of 5 translates into these guidelines:
Ensure safety - Sun damage prevention is strongly urged. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Beware! Reflecting off water and sand, UV rays are much stronger.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Port Saint Lucie, FL
- Average high temperature in December: 74.3°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 (71.2°F).
- Average low temperature in December: 63.9°F
The month with the highest average low temperature is August (78.4°F).
The coldest month (with the lowest average low temperature) is January (59.5°F).
Average pressure in December
Port Saint Lucie, FL
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).
Average wind speed in December
Port Saint Lucie, FL
- Average wind speed in December: 8.8mph
The windiest month (with the highest average wind speed) is March (9.4mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in December
Port Saint Lucie, FL
- Average humidity in December: 77%
The months with the highest relative humidity are June, July, August and September (78%).
The month with the lowest relative humidity is March (71%).
Average rainfall in December
Port Saint Lucie, FL
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is August (2.99").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in December
Port Saint Lucie, FL
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is August (23.5 days).
The month with the least rainy days is January (8.2 days).
Average sea temperature in December
Port Saint Lucie, FL
- Average sea temperature in December: 75.6°F
The best month for swimming (with the highest average sea temperature) is August (85.1°F).
The coldest month (with the lowest average sea temperature) is February (73.3°F).
Average daylight in December /
Average sunshine in December
Port Saint Lucie, FL
- Average daylight in December: 10h and 30min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in December: 6h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are January and December (Average sunshine: 6h and 6min).
Average sunshine days in December
Port Saint Lucie, FL
- Average sunshine days in December: 16.1 days
The month with the most sunshine days is January (18.7 days).
The month with the least sunshine days is August (3.8 days).
Average UV index in December
Port Saint Lucie, 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 months with the lowest UV index are January, February and December (UV index 5).
Average cloud cover in December
Port Saint Lucie, FL
- Average cloud cover in December: 34
The months with the most cloud cover are November and December (Cloud cover 34).
The months with the least cloud cover are May, July and August (Cloud cover 27).
Average visibility in December
Port Saint Lucie, 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).
