December weather forecast
Inarajan, GU

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.