December weather forecastInarajan, GU
December
Weather in December
December in Inarajan, Guam, rounds off the year with the commencement of the cooler winter season. Although, 'cool' is a relative term as temperatures maintain a high degree, reflecting the tropical climate of the region. The rainfall drops to 2.99" (76mm) over 22.8 days, revealing a trend towards drier conditions. As the winds pick up their pace to 15.7mph (25.3km/h), they bring in a refreshing change in the otherwise warm climes. While daylight hours have reduced to 11.4, the brightness is not compromised, maintaining the cheerful spirit of the holiday season.Temperature
Inarajan, Guam, indicates an average high-temperature of a still warm 83.5°F (28.6°C) in December, showing minor variation from November's 84.2°F (29°C). An average low-temperature of 82°F (27.8°C) characterizes Inarajan's December nights.Heat index
The heat index in December is evaluated at a tropical 91.4°F (33°C). Take more safety measures, heat exhaustion and heat cramps are potential outcomes. Persistent activity might lead to heatstroke.Remember that heat index calculations are made for conditions in the shade with light wind. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', integrates the air's temperature and its humidity to showcase the felt temperature by people. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
Humidity
The months with the highest humidity are January, March through May, October through December, with an average relative humidity of 78%.Rainfall
In Inarajan, in December, it is raining for 22.8 days, with typically 2.99" (76mm) of accumulated precipitation. In Inarajan, during the entire year, the rain falls for 288.5 days and collects up to 60.08" (1526mm) of precipitation.Ocean temperature
In December, the average ocean temperature in Inarajan is 83.1°F (28.4°C).Note: In water temperatures ranging between 77°F (25°C) and 84.2°F (29°C), activities such as swimming and diving become highly pleasurable for long durations.
Daylight
With an average of 11h and 24min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 6:28 am and sunset at 5:52 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:04 pm ChST.
Sunshine
In Inarajan, the average sunshine in December is 6.5h.UV index
January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index in Inarajan. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.Note: An average maximum UV index of 7 in December leads to these recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Watch out! Sand and water enhance the UV exposure you receive.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Inarajan, 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).
Average pressure in December
Inarajan, 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).
Average wind speed in December
Inarajan, 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).
Average humidity in December
Inarajan, 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%).
Average rainfall in December
Inarajan, 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").
Average rainfall days in December
Inarajan, 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).
Average sea temperature in December
Inarajan, 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).
Average daylight in December /
Average sunshine in December
Inarajan, GU
- Average daylight in December: 11h and 24min
The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 24min).
- 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).
Average sunshine days in December
Inarajan, 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).
Average UV index in December
Inarajan, 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).
Average cloud cover in December
Inarajan, 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).
Average visibility in December
Inarajan, 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).
