December weather forecast
Tinian International Airport, Northern Mariana Islands, USA

December witnesses similar climatic conditions as November, setting the ground for cooler weather and shortening daylight hours. The month forecasts rainfall of 4.8" (122mm) over 22 days, providing the region with a moist and tranquil atmosphere. The noticeable drop in the UV Index suggests that the intensity of sunlight is less harsh. Even in the closing month of the year, sea temperature stays agreeably warm. This month's weather conditions make it an ideal time for visitors to explore the city without concern for excessive heat.

Temperature

December in Tinian International Airport, Northern Mariana Islands, notes an average high-temperature of a still tropical 86°F (30°C), aligning with the previous month's conditions. Throughout the nights in December, an average low-temperature of 75.2°F (24°C) is noted in Tinian International Airport, Northern Mariana Islands.

Rainfall

In December, the rain falls for 22 days. Throughout December, 4.76" (121mm) of precipitation is accumulated. Throughout the year, there are 247 rainfall days, and 79.21" (2012mm) of precipitation is accumulated.

Ocean temperature

In Tinian International Airport, in December, the average water temperature is 82.9°F (28.3°C).
Note: Swimming, diving, and other water activities in temperatures ranging from 77°F (25°C) to 84.2°F (29°C) are highly enjoyable and provide prolonged comfort without unease.

Daylight

December has the shortest days of the year, with an average of 11h and 18min of daylight.
On the first day of the month, sunrise is at 6:27 am and sunset at 5:45 pm. On the last day of December, in Tinian International Airport, sunrise is at 6:42 am and sunset at 5:58 pm ChST.

Sunshine

The months with the least sunshine are August through December, with an average of 5h of sunshine.

UV index

The months with the lowest UV index are November and December, with an average maximum UV index of 9. A UV Index reading of 8 to 10 represents a very high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the UV index of 9 transforms into the following advice:
Ensure you're protected; unprotected eyes and skin can get hurt in moments. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Despite the overcast weather, sunscreen with SPF of at least 30 should be applied liberally and reapplied often, particularly after swimming or an outdoor workout. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.