December weather forecast
Piti, GU

December in Piti, Guam, marks the culmination of the year with temperatures comfortably cooler compared to November. Despite a decrease in temperature, the weather remains pleasant enough for outdoor activities and beach visits. Transitioning from December to January, the weather retains its coolness, and a slight dip in temperatures is expected. The significant drop in rainfall with an average count of 2.99" (76mm) makes December one of the driest months in Piti, promising undisturbed, festive celebrations.

Temperature

Piti experiences an average high-temperature of a still moderately hot 83.5°F (28.6°C) with the onset of December, subtly varied from November's 84.2°F (29°C). December introduces a small decrease to a nighttime average of 82°F (27.8°C).

Heat index

The heat index value for December is appraised at a tropical 91.4°F (33°C). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', blends air temperature and moisture content to represent the felt temperature to humans. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.

Humidity

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

Rainfall

In Piti, in December, it is raining for 22.8 days, with typically 2.99" (76mm) of accumulated precipitation. In Piti, Guam, during the entire year, the rain falls for 288.5 days and collects up to 60.08" (1526mm) of precipitation.

Ocean temperature

In Piti, in December, the average water temperature is 83.1°F (28.4°C).
Note: Engaging in water activities, such as swimming or diving, in temperatures from 77°F (25°C) to 84.2°F (29°C) is very pleasurable for extended periods, without any discomfort.

Daylight

December has the shortest days of the year, with an average of 11h and 24min of daylight.
On the first day of the month, sunrise is at 6:28 am and sunset at 5:52 pm. On the last day of December, sunrise is at 6:43 am and sunset at 6:04 pm ChST.

Sunshine

The average sunshine in December 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 hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum UV index, 7 during December, leads to the following recommendations:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be on guard! The reflective nature of sand and water boosts UV exposure.