December weather forecastGuánica, PR
December
Weather in December
The last month of the year, December, is characterized by further reduction in rainfall amounts, marking the onset of the dry season properly. With the reduction in rain and humidity compared to the wet season months, December sees a transformation in the landscape of Guánica, allowing for varied experiences. The consistently warm temperatures combined with sufficient daylight hours create an inviting atmosphere for outdoor activities. Whether lounging on the beach or exploring the diverse flora and fauna, there is considerable enjoyment to be had at this time of year. This pleasantly dry month bridges the gap between the old and the new year, bidding farewell to the lush wet season and welcoming the clear skies of the dry season.Temperature
With the advent of December, Guánica's high-temperatures adjust to a still warm 82.4°F (28°C), closely aligning with the preceding month. Guánica experiences an average nighttime temperature of 73.2°F (22.9°C) in the month of December.Heat index
December's mean heat index is calculated to be a tropical 89.6°F (32°C). If exposure and ongoing activity persist, they might induce a state of tiredness and heat cramps.Heat index details are generally centered around shaded locations and a mild breeze. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
Humidity
In December, the average relative humidity is 78%.Rainfall
In December, the rain falls for 16.3 days. Throughout December, 1.22" (31mm) of precipitation is accumulated. In Guánica, during the entire year, the rain falls for 224.9 days and collects up to 23.58" (599mm) of precipitation.Snowfall
In Guánica, snow does not fall in January through August, October through December.Ocean temperature
In Guánica, in December, the average water temperature is 81.9°F (27.7°C).Note: Between 77°F (25°C) and 84.2°F (29°C), water temperature is typically considered very warm and pleasurable by everyone. Water activities at these temperatures are enjoyable for extended periods without discomfort.
Daylight
With an average of 11h and 6min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 6:43 am and sunset at 5:50 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:03 pm AST.
Sunshine
The average sunshine in December is 7.4h.UV index
January through March, November and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: An average maximum UV index of 6 in December leads to these recommendations:
Shun overexposure. Protection from sun ravages is indispensable. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Attention! UV radiation is markedly stronger with water and sand reflections.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Guánica, PR
- Average high temperature in December: 82.4°F
The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is January (81.9°F).
- Average low temperature in December: 73.2°F
The months with the highest average low temperature are July, August and October (76.6°F).
The coldest month (with the lowest average low temperature) is March (71.4°F).
Average pressure in December
Guánica, PR
- Average pressure in December: 29.97"Hg
The months with the highest atmospheric pressure are January and February (30.01"Hg).
The month with the lowest atmospheric pressure is October (29.89"Hg).
Average wind speed in December
Guánica, PR
- Average wind speed in December: 6.7mph
The windiest month (with the highest average wind speed) is July (8mph).
The calmest month (with the lowest average wind speed) is November (5.6mph).
Average humidity in December
Guánica, PR
- Average humidity in December: 78%
The month with the highest relative humidity is November (80%).
The month with the lowest relative humidity is March (75%).
Average rainfall in December
Guánica, PR
- Average rainfall in December: 1.22"
The wettest month (with the highest rainfall) is September (3.58").
The driest month (with the least rainfall) is January (0.71").
Average rainfall days in December
Guánica, PR
- Average rainfall days in December: 16.3 days
The month with the highest number of rainy days is November (22.5 days).
The month with the least rainy days is February (14.8 days).
Average snowfall days in December
Guánica, PR
- 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
Guánica, PR
- Average sea temperature in December: 81.9°F
The best month for swimming (with the highest average sea temperature) is September (85°F).
The coldest month (with the lowest average sea temperature) is February (79.1°F).
Average daylight in December /
Average sunshine in December
Guánica, PR
- Average daylight in December: 11h and 6min
The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 6min).
- Average sunshine in December: 7h and 24min
The month with the most sunshine is June (Average sunshine: 11h and 18min).
The month with the least sunshine is November (Average sunshine: 7h and 6min).
Average sunshine days in December
Guánica, PR
- Average sunshine days in December: 9.4 days
The month with the most sunshine days is June (12.2 days).
The month with the least sunshine days is November (5.1 days).
Average UV index in December
Guánica, PR
- 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 months with the lowest UV index are January, February, March, November and December (UV index 6).
Average cloud cover in December
Guánica, PR
- Average cloud cover in December: 23
The month with the most cloud cover is May (Cloud cover 30).
The months with the least cloud cover are January and February (Cloud cover 22).
Average visibility in December
Guánica, PR
- 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).
