This report describes the typical weather at the Honolulu International Airport (Honolulu, Hawaii, United States) weather station over the course of an average December. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Honolulu, Hawaii has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by oceans and seas (97%) and built-up areas (3%).
The month of December is characterized by gradually falling daily high temperatures, with daily highs around 81°F throughout the month, exceeding 85°F or dropping below 77°F only one day in ten.
Over the course of December, the length of the day is essentially constant. The shortest day of the month is December 20 with 10:50 hours of daylight; the longest day is December 1 with 10:55 hours of daylight.
The earliest sunrise is at 6:53am on December 1; the latest sunset is at 6:01pm on December 31; the latest sunrise is at 7:10am on December 31; the earliest sunset is at 5:49pm on December 1.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 51% (partly cloudy) and does not vary substantially over the course of the month.
On December 16, a representative day, the sky is clear or mostly clear 31% of the time, partly cloudy 34% of the time, and mostly cloudy or overcast 35% of the time.
The average probability that some form of precipitation will be observed in a given day is 41%, with little variation over the course of the month.
Throughout December, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 62% of those days with precipitation. It is most likely around December 3, when it is observed during 27% of all days.
Moderate rain is the most severe precipitation observed during 26% of those days with precipitation. It is most likely around December 31, when it is observed during 11% of all days.
Either snow is exceptionally unlikely to fall at this location in December or this station does not reliably report precipitation types.
The relative humidity typically ranges from 56% (mildly humid) to 88% (very humid) over the course of a typical December, rarely dropping below 47% (comfortable) and reaching as high as 97% (very humid).
The air is driest around December 1, at which time the relative humidity drops below 61% (mildly humid) three days out of four; it is most humid around December 31, rising above 84% (humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical December, the dew point typically varies from 61°F (comfortable) to 68°F (muggy) and is rarely below 56°F (comfortable) or above 72°F (very muggy).
Over the course of December typical wind speeds vary from 0 mph to 17 mph (calm to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around December 3, at which time the average daily maximum wind speed is 17 mph (moderate breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around December 31, at which time the average daily maximum wind speed is 15 mph (moderate breeze).