December weather forecastMaunaloa, HI
December
Weather in December
Throughout December, Maunaloa's weather displays characteristic patterns for year-end, with temperatures decreasing further to 75.9°F (24.4°C) and daylight shortening to 10.9 hours. Even as Christmas approaches, sunshine-hours remain ample enough for a warm winter holiday. Trade winds carry a touch of chill, validating the seasonal climate shift. A substantial increase in rainfall up to 1.22" (31mm) signifies the height of the wet season. Despite these transitions, sea temperatures stay relatively high at 77°F (25°C), ensuring continued enjoyment of water activities.Temperature
The arrival of December denotes a barely perceptible change in the average high-temperatures to a still warm 75.9°F (24.4°C) from November's 78.1°F (25.6°C). Maunaloa registers a gentle descent to an average nighttime low of 73.6°F (23.1°C) in December from its daytime highs.Humidity
The average relative humidity in December is 75%.Rainfall
In Maunaloa, during December, the rain falls for 11.4 days and regularly aggregates up to 1.22" (31mm) of precipitation. Throughout the year, there are 126.4 rainfall days, and 9.84" (250mm) of precipitation is accumulated.Ocean temperature
In Maunaloa, in December, the average water temperature is 77°F (25°C).Note: Water activities in temperatures ranging from 77°F (25°C) to 84.2°F (29°C) are pleasurable, without feeling uncomfortable even during extended periods.
Daylight
December has the shortest days of the year, with an average of 10h and 54min of daylight.On the first day of December, sunrise is at 6:50 am and sunset at 5:46 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:58 pm HST.
Sunshine
The month with the least sunshine is December, with an average of 6.8h of sunshine.UV index
The months with the lowest UV index are January through May, November and December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.Note: The UV index of 6 in December translates into these instructions:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Opt for tightly woven and loose clothing to enhance protection from the Sun. Attention! The reflection of both water and sand can increase the intensity of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Maunaloa, HI
- Average high temperature in December: 75.9°F
The warmest months (with the highest average high temperature) are August and September (80.2°F).
The month with the lowest average high temperature is February (74.3°F).
- Average low temperature in December: 73.6°F
The months with the highest average low temperature are September and October (77.2°F).
The coldest month (with the lowest average low temperature) is March (71.2°F).
Average pressure in December
Maunaloa, HI
- Average pressure in December: 29.99"Hg
The months with the highest atmospheric pressure are March and April (30.05"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).
Average wind speed in December
Maunaloa, HI
- Average wind speed in December: 12mph
The windiest month (with the highest average wind speed) is July (13.9mph).
The calmest month (with the lowest average wind speed) is January (10.8mph).
Average humidity in December
Maunaloa, HI
- Average humidity in December: 75%
The months with the highest relative humidity are April, May, June, July and August (76%).
The months with the lowest relative humidity are January and November (74%).
Average rainfall in December
Maunaloa, HI
- Average rainfall in December: 1.22"
The wettest month (with the highest rainfall) is March (1.3").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in December
Maunaloa, HI
- Average rainfall days in December: 11.4 days
The month with the highest number of rainy days is March (13.2 days).
The month with the least rainy days is July (8.5 days).
Average sea temperature in December
Maunaloa, HI
- Average sea temperature in December: 77°F
The best months for swimming (with the highest average sea temperature) are September and October (81°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (75°F).
Average daylight in December /
Average sunshine in December
Maunaloa, HI
- Average daylight in December: 10h and 54min
The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).
- Average sunshine in December: 6h and 48min
The month with the most sunshine is June (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in December
Maunaloa, HI
- Average sunshine days in December: 12.5 days
The month with the most sunshine days is July (16.1 days).
The month with the least sunshine days is November (10.8 days).
Average UV index in December
Maunaloa, HI
- Average UV index in December: 6
The months with the highest UV index are June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, February, March, April, May, November and December (UV index 6).
Average cloud cover in December
Maunaloa, HI
- Average cloud cover in December: 27
The months with the most cloud cover are February and March (Cloud cover 30).
The month with the least cloud cover is September (Cloud cover 23).
Average visibility in December
Maunaloa, HI
- 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).
