December weather forecastPiti, GU
December
Weather in December
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Piti, GU
- Average high temperature in December: 83.5°F
The warmest months (with the highest average high temperature) are July and August (84.7°F).
The month with the lowest average high temperature is February (81.7°F).
- Average low temperature in December: 82°F
The month with the highest average low temperature is June (83.3°F).
The coldest month (with the lowest average low temperature) is February (79.7°F).
Average pressure in December
Piti, GU
- Average pressure in December: 29.83"Hg
The month with the highest atmospheric pressure is February (29.88"Hg).
The months with the lowest atmospheric pressure are August, September and October (29.79"Hg).
Average wind speed in December
Piti, GU
- Average wind speed in December: 15.7mph
The windiest month (with the highest average wind speed) is February (16.3mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).
Average humidity in December
Piti, GU
- Average humidity in December: 78%
The months with the highest relative humidity are January, March, April, May, October, November and December (78%).
The month with the lowest relative humidity is August (76%).
Average rainfall in December
Piti, GU
- Average rainfall in December: 2.99"
The wettest month (with the highest rainfall) is September (10.28").
The driest month (with the least rainfall) is March (1.81").
Average rainfall days in December
Piti, GU
- Average rainfall days in December: 22.8 days
The months with the highest number of rainy days are July and August (28.9 days).
The month with the least rainy days is February (17.5 days).
Average sea temperature in December
Piti, GU
- Average sea temperature in December: 83.2°F
The best month for swimming (with the highest average sea temperature) is August (85.4°F).
The coldest month (with the lowest average sea temperature) is February (82°F).
Average daylight in December /
Average sunshine in December
Piti, GU
- Average daylight in December: 11h and 24min
The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 24min).
- Average sunshine in December: 6h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is November (Average sunshine: 6h and 18min).
Average sunshine days in December
Piti, GU
- Average sunshine days in December: 4.7 days
The month with the most sunshine days is March (6.6 days).
The month with the least sunshine days is September (1.1 days).
Average UV index in December
Piti, GU
- Average UV index in December: 7
The months with the highest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 7).
The month with the lowest UV index is September (UV index 6).
Average cloud cover in December
Piti, GU
- Average cloud cover in December: 44
The months with the most cloud cover are January, August and October (Cloud cover 46).
The months with the least cloud cover are May and June (Cloud cover 39).
Average visibility in December
Piti, GU
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
