This report describes the typical weather at the Honolulu International Airport (Honolulu, Hawaii, United States) weather station over the course of an average January. 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 January is characterized by essentially constant daily high temperatures, with daily highs around 80°F throughout the month, exceeding 83°F or dropping below 76°F only one day in ten.
Over the course of January, the length of the day is essentially constant. The shortest day of the month is January 1 with 10:51 hours of daylight; the longest day is January 31 with 11:12 hours of daylight.
The earliest sunrise is at 7:09am on January 31; the latest sunset is at 6:21pm on January 31; the latest sunrise is at 7:12am on January 16; the earliest sunset is at 6:01pm on January 1.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 50% (partly cloudy) and does not vary substantially over the course of the month.
On January 16, a representative day, the sky is clear or mostly clear 33% of the time, partly cloudy 34% of the time, and mostly cloudy or overcast 34% of the time.
The average probability that some form of precipitation will be observed in a given day is 38%, with little variation over the course of the month.
Throughout January, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 59% of those days with precipitation. It is most likely around January 1, when it is observed during 23% of all days.
Moderate rain is the most severe precipitation observed during 27% of those days with precipitation. It is most likely around January 1, when it is observed during 11% of all days.
Either snow is exceptionally unlikely to fall at this location in January 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 January, rarely dropping below 45% (comfortable) and reaching as high as 97% (very humid).
The air is driest around January 31, at which time the relative humidity drops below 62% (mildly humid) three days out of four; it is most humid around January 1, 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 January, the dew point typically varies from 59°F (comfortable) to 67°F (muggy) and is rarely below 53°F (very comfortable) or above 71°F (very muggy).
Over the course of January typical wind speeds vary from 0 mph to 16 mph (calm to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around January 25, at which time the average daily maximum wind speed is 16 mph (moderate breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around January 1, at which time the average daily maximum wind speed is 15 mph (moderate breeze).