December weather forecast
Hagåtña, GU

Weather in December

The first month of the winter, December, is also a moderately hot month in Hagåtña, Guam, with temperature in the range of an average high of 83.5°F (28.6°C) and an average low of 82°F (27.8°C).

Temperature

In Hagåtña, the average high-temperature in December is practically the same as in November - a still warm 83.5°F (28.6°C). In December, the average low-temperature is 82°F (27.8°C).

Heat index

In December, the average heat index is appraised at a hot 91.4°F (33°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. 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 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, wind, differences in body mass, height, and shape, and pregnancy affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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

The months with the highest humidity in Hagåtña are January, March through May, October through December, with an average relative humidity of 78%.

Rainfall

In Hagåtña, during December, the rain falls for 22.8 days and regularly aggregates up to 2.99" (76mm) of precipitation. Throughout the year, there are 288.5 rainfall days, and 60.08" (1526mm) of precipitation is accumulated.

Ocean temperature

In Hagåtña, the average seawater temperature in December is 83.1°F (28.4°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

With an average of 11h and 21min of daylight, December has the shortest days of the year in Hagåtña.
On the first day of December in Hagåtña, Guam, sunrise is at 6:27 am and sunset at 5:51 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:04 pm ChST.

Sunshine

In December, the average sunshine is 6.5h.

UV index

The months with the highest UV index are January through August, October through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 7 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 Hagåtña?

In Hagåtña, Guam, in December, the average high-temperature is 83.5°F (28.6°C), and the average low-temperature is 82°F (27.8°C). in December, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is appraised at 91.4°F (33°C).

What is the most humid month in Hagåtña?

January, March through May, October through December, with an average relative humidity of 78%, are most humid months in Hagåtña, Guam.

What is the average humidity in December in Hagåtña?

In December, the average relative humidity in Hagåtña is 78%.

How much does it rain in Hagåtña in December?

In Hagåtña, Guam, in December, during 22.8 rainfall days, 2.99" (76mm) of precipitation is typically accumulated.

What is the ocean temperature in December in Hagåtña?

In Hagåtña, in December, the average water temperature is 83.1°F (28.4°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the month with the shortest days in Hagåtña?

With an average of 11h and 21min of daylight, December has the shortest days of the year in Hagåtña, Guam.

How many hours of daylight does Hagåtña have in December?

The average day length in December is 11h and 21min.

What time are sunrise and sunset in December in Hagåtña?

On the first day of December, sunrise is at 6:27 am and sunset at 5:51 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:04 pm ChST.

How long on average sun shines in December in Hagåtña?

In December, the average sunshine duration in Hagåtña is 6.5h.

When is the highest UV index in Hagåtña?

January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index in Hagåtña, Guam.

What is the UV index intensity in December in Hagåtña?

The average daily maximum UV index in December is 7. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.

Average temperature in December
Hagåtña, GU

Average temperature in December - Hagåtña, GU
  • Average high temperature in December: 83.5°F

The warmest months (with the highest average high temperature) are July and August (84.7°F).
The month with the lowest average high temperature is February (81.7°F).

  • Average low temperature in December: 82°F

The month with the highest average low temperature is June (83.3°F).
The coldest month (with the lowest average low temperature) is February (79.7°F).

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Average pressure in December
Hagåtña, GU

Average pressure in December - Hagåtña, GU
  • Average pressure in December: 29.83"Hg

The month with the highest atmospheric pressure is February (29.88"Hg).
The months with the lowest atmospheric pressure are August, September and October (29.79"Hg).

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Average wind speed in December
Hagåtña, GU

Average wind speed in December - Hagåtña, GU
  • Average wind speed in December: 15.7mph

The windiest month (with the highest average wind speed) is February (16.3mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).

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Average humidity in December
Hagåtña, GU

Average humidity in December - Hagåtña, GU
  • Average humidity in December: 78%

The months with the highest relative humidity are January, March, April, May, October, November and December (78%).
The month with the lowest relative humidity is August (76%).

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Average rainfall in December
Hagåtña, GU

Average rainfall in December - Hagåtña, GU
  • Average rainfall in December: 2.99"

The wettest month (with the highest rainfall) is September (10.28").
The driest month (with the least rainfall) is March (1.81").

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Average rainfall days in December
Hagåtña, GU

Average rainfall days in December - Hagåtña, GU
  • Average rainfall days in December: 22.8 days

The months with the highest number of rainy days are July and August (28.9 days).
The month with the least rainy days is February (17.5 days).

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Average sea temperature in December
Hagåtña, GU

Average sea temperature in December - Hagåtña, GU
  • Average sea temperature in December: 83.2°F

The best month for swimming (with the highest average sea temperature) is August (85.4°F).
The coldest month (with the lowest average sea temperature) is February (82°F).

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Average daylight in December /
Average sunshine in December
Hagåtña, GU

Average daylight in December / Average sunshine in December - Hagåtña, GU
  • Average daylight in December: 11h and 21min

The month with the longest days is June (Average daylight: 12h and 55min).
The month with the shortest days is December (Average daylight: 11h and 21min).

  • Average sunshine in December: 6h and 30min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is November (Average sunshine: 6h and 18min).

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Average sunshine days in December
Hagåtña, GU

Average sunshine days in December - Hagåtña, GU
  • Average sunshine days in December: 4.7 days

The month with the most sunshine days is March (6.6 days).
The month with the least sunshine days is September (1.1 days).

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Average UV index in December
Hagåtña, GU

Average UV index in December - Hagåtña, GU
  • Average UV index in December: 7

The months with the highest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 7).
The month with the lowest UV index is September (UV index 6).

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Average cloud cover in December
Hagåtña, GU

Average cloud cover in December - Hagåtña, GU
  • Average cloud cover in December: 44

The months with the most cloud cover are January, August and October (Cloud cover 46).
The months with the least cloud cover are May and June (Cloud cover 39).

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Average visibility in December
Hagåtña, GU

Average visibility in December - Hagåtña, GU
  • 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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