December weather forecast
Agat, GU

December brings the soothing cool weather to Agat, granting a relief from the comparatively hot climate witnessed through the year. Interestingly, even towards the end of the year, the minimum temperature stays at a comfortable 82°F (27.8°C), providing an enjoyable atmosphere. This month shows a marked decrease in rainfall from November, measuring at 2.99" (76mm), contributing to the pleasant climate of the town. As the year concludes, Agat offers the perfect tropical winter escape with warmer temperatures and lesser rainfall compared to most regions.

Temperature

Agat 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). Agat maintains a near steady average temperature of 82°F (27.8°C) during the nights of December, demonstrating little drop from daytime highs.

Heat index

The heat index value for December is computed to be a hot 91.4°F (33°C). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'feels like' or 'apparent temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.

Humidity

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

Rainfall

In December, the rain falls for 22.8 days. Throughout December, 2.99" (76mm) of precipitation is accumulated. In Agat, during the entire year, the rain falls for 288.5 days and collects up to 60.08" (1526mm) of precipitation.

Daylight

The month with the shortest days is December, with an average of 11h and 24min of daylight.
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 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 reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 7 during December translates into the following recommendations:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. During bright days, sunglasses that offer UVA and UVB defense are recommended.