December weather forecast
Merizo, GU

December conclusively concludes the volatile weather transition from the wet to the dry season. The lower rainfall value of 2.99" (76mm) underlines the approach towards the dry spell. Consequently, a considerable increase in wind speed to 15.7 MPH, coupled with a dip in sea temperature, further marks the shift from the rainy season. Despite these changes, December enjoys consistent humidity and pressure levels, typical of a tropical climate. As the year winds down, the weather conditions pave the way for welcoming visitors seeking a tropical winter escape.

Temperature

Merizo starts December with an average high-temperature of a still warm 83.5°F (28.6°C), hinting at a minimal fluctuation from November. December nights in Merizo register a minor temperature decline, steadying at a still moderately hot 82°F (27.8°C).

Heat index

For December, the heat index is evaluated at a hot 91.4°F (33°C). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.
Research indicates the heat index considers values in shaded locales and with light winds. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', ties air temperature with relative humidity to produce the perceived temperature sensation. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.

Humidity

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

Rainfall

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

Ocean temperature

In Merizo, in December, the average water temperature is 83.1°F (28.4°C).
Note: Between the temperatures of 77°F (25°C) and 84.2°F (29°C), water is considered very warm, providing pleasure in water activities without discomfort over lengthy periods.

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 6:05 pm ChST.

Sunshine

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. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the maximum UV index of 7 suggests this advice:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be on guard! The reflective nature of sand and water boosts UV exposure.