December weather forecast
Juana Díaz, PR

Weather in December

The first month of the winter, December, is still a warm month in Juana Díaz, Puerto Rico, with temperature in the range of an average low of 72.7°F (22.6°C) and an average high of 82°F (27.8°C).

Temperature

In Juana Díaz, the average high-temperature in December is essentially the same as in November - a still warm 82°F (27.8°C). In Juana Díaz, the average low-temperature is 72.7°F (22.6°C).

Heat index

The average heat index in December is calculated to be a tropical 88.7°F (31.5°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, metabolic differences, pregnancy, and wind affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In Juana Díaz, the average relative humidity in December is 79%.

Rainfall

In December, in Juana Díaz, the rain falls for 18.6 days. Throughout December, 1.42" (36mm) of precipitation is accumulated. In Juana Díaz, during the entire year, the rain falls for 249.1 days and collects up to 28.82" (732mm) of precipitation.

Ocean temperature

In Juana Díaz, the average seawater temperature in December is 82°F (27.8°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

December has the shortest days of the year in Juana Díaz, with an average of 11h and 4min of daylight.
On the first day of December, sunrise is at 6:41 am and sunset at 5:48 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:01 pm AST.

Sunshine

In Juana Díaz, the average sunshine in December is 7h.

UV index

January through April, 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 threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in December in Juana Díaz?

In December, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 72.7°F (22.6°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, in December is calculated to be 88.7°F (31.5°C).

What is the average humidity in December in Juana Díaz?

In Juana Díaz, the average relative humidity in December is 79%.

How many days does it rain in December in Juana Díaz?

In Juana Díaz, Puerto Rico, in December, during 18.6 rainfall days, 1.42" (36mm) of precipitation is typically accumulated.

What is the ocean temperature in December in Juana Díaz?

In Juana Díaz, Puerto Rico, in December, the average water temperature is 82°F (27.8°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the month with the shortest days in Juana Díaz?

The month with the shortest days in Juana Díaz, Puerto Rico, is December, with an average of 11h and 4min of daylight.

What is the average length of the day in December in Juana Díaz?

In December, the average day length in Juana Díaz is 11h and 4min.

When is the sunrise / sunset in December in Juana Díaz?

On the first day of December in Juana Díaz, Puerto Rico, sunrise is at 6:41 am and sunset at 5:48 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:01 pm AST.

How long on average sun shines in December in Juana Díaz?

In Juana Díaz, the average sunshine duration in December is 7h.

When is the lowest UV index in Juana Díaz?

The months with the lowest UV index in Juana Díaz, Puerto Rico, are January through April, November and December, with an average maximum UV index of 6.

How high is the UV index in December in Juana Díaz?

The average daily maximum UV index in December in Juana Díaz, Puerto Rico, is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Juana Díaz, PR

Average temperature in December - Juana Díaz, PR
  • Average high temperature in December: 82°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°F).

  • Average low temperature in December: 72.7°F

The month with the highest average low temperature is August (76.6°F).
The coldest months (with the lowest average low temperature) are February and March (70.9°F).

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Average pressure in December
Juana Díaz, PR

Average pressure in December - Juana Díaz, PR
  • Average pressure in December: 29.98"Hg

The months with the highest atmospheric pressure are January and February (30.01"Hg).
The months with the lowest atmospheric pressure are October and November (29.9"Hg).

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Average wind speed in December
Juana Díaz, PR

Average wind speed in December - Juana Díaz, PR
  • Average wind speed in December: 6.6mph

The windiest month (with the highest average wind speed) is July (8mph).
The calmest month (with the lowest average wind speed) is November (5.5mph).

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Average humidity in December
Juana Díaz, PR

Average humidity in December - Juana Díaz, PR
  • Average humidity in December: 79%

The month with the highest relative humidity is November (81%).
The month with the lowest relative humidity is March (76%).

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Average rainfall in December
Juana Díaz, PR

Average rainfall in December - Juana Díaz, PR
  • Average rainfall in December: 1.42"

The wettest month (with the highest rainfall) is September (4.45").
The driest month (with the least rainfall) is February (0.83").

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Average rainfall days in December
Juana Díaz, PR

Average rainfall days in December - Juana Díaz, PR
  • Average rainfall days in December: 18.6 days

The month with the highest number of rainy days is October (24.8 days).
The month with the least rainy days is February (15 days).

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Average sea temperature in December
Juana Díaz, PR

Average sea temperature in December - Juana Díaz, PR
  • Average sea temperature in December: 81.9°F

The best month for swimming (with the highest average sea temperature) is September (85.3°F).
The coldest month (with the lowest average sea temperature) is March (79.3°F).

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Average daylight in December /
Average sunshine in December
Juana Díaz, PR

Average daylight in December / Average sunshine in December - Juana Díaz, PR
  • Average daylight in December: 11h and 4min

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 4min).

  • Average sunshine in December: 7h and 0min

The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is November (Average sunshine: 6h and 54min).

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Average sunshine days in December
Juana Díaz, PR

Average sunshine days in December - Juana Díaz, PR
  • Average sunshine days in December: 7 days

The month with the most sunshine days is March (7.6 days).
The month with the least sunshine days is October (2.6 days).

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Average UV index in December
Juana Díaz, PR

Average UV index in December - Juana Díaz, PR
  • Average UV index in December: 6

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, February, March, April, November and December (UV index 6).

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Average cloud cover in December
Juana Díaz, PR

Average cloud cover in December - Juana Díaz, PR
  • Average cloud cover in December: 28

The month with the most cloud cover is May (Cloud cover 34).
The month with the least cloud cover is February (Cloud cover 25).

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Average visibility in December
Juana Díaz, PR

Average visibility in December - Juana Díaz, 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).

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