Average Weather in January in Ko Olina Hawaii, United States
Daily high temperatures are around 81°F, rarely falling below 77°F or exceeding 83°F. The lowest daily average high temperature is 80°F on January 30.
Daily low temperatures are around 66°F, rarely falling below 60°F or exceeding 72°F. The lowest daily average low temperature is 66°F on January 31.
For reference, on August 21, the hottest day of the year, temperatures in Ko Olina typically range from 73°F to 88°F, while on January 28, the coldest day of the year, they range from 66°F to 80°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in January
The month of January in Ko Olina experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 23% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 22% on January 18.
The clearest day of the month is January 18, with clear, mostly clear, or partly cloudy conditions 78% of the time.
For reference, on October 31, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 42%, while on January 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 78%.
Cloud Cover Categories in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Ko Olina, the chance of a wet day over the course of January is essentially constant, remaining around 23% throughout.
For reference, the year's highest daily chance of a wet day is 25% on January 11, and its lowest chance is 7% on June 20.
Probability of Precipitation in January
The average sliding 31-day rainfall during January in Ko Olina is decreasing, starting the month at 2.8 inches, when it rarely exceeds 7.4 inches or falls below 0.2 inches, and ending the month at 2.3 inches, when it rarely exceeds 5.7 inches or falls below 0.1 inches.
The highest average 31-day accumulation is 2.8 inches on January 1.
Average Monthly Rainfall in January
Over the course of January in Ko Olina, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 20 minutes, implying an average daily increase of 40 seconds, and weekly increase of 4 minutes, 42 seconds.
The shortest day of the month is January 1, with 10 hours, 52 minutes of daylight and the longest day is January 31, with 11 hours, 12 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Ko Olina is 7:12 AM on January 16 and the earliest sunrise is 2 minutes, 38 seconds earlier at 7:10 AM on January 31.
The earliest sunset is 6:02 PM on January 1 and the latest sunset is 20 minutes later at 6:22 PM on January 31.
Daylight saving time is not observed in Ko Olina during 2018.
For reference, on June 21, the longest day of the year, the Sun rises at 5:51 AM and sets 13 hours, 26 minutes later, at 7:17 PM, while on December 21, the shortest day of the year, it rises at 7:05 AM and sets 10 hours, 50 minutes later, at 5:55 PM.
Sunrise & Sunset with Twilight in January
The chance that a given day will be muggy in Ko Olina is gradually decreasing during January, falling from 28% to 24% over the course of the month.
For reference, on October 10, the muggiest day of the year, there are muggy conditions 68% of the time, while on April 1, the least muggy day of the year, there are muggy conditions 19% of the time.
Humidity Comfort Levels in January
The average hourly wind speed in Ko Olina is essentially constant during January, remaining within 0.1 miles per hour of 12.3 miles per hour throughout.
For reference, on July 3, the windiest day of the year, the daily average wind speed is 16.4 miles per hour, while on January 10, the calmest day of the year, the daily average wind speed is 12.2 miles per hour.
The lowest daily average wind speed during January is 12.2 miles per hour on January 10.
Average Wind Speed in January
Wind Direction in January
Ko Olina is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Ko Olina is essentially constant during January, remaining around 76°F throughout.
Average Water Temperature in January
Temperatures in Ko Olina are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and the Growing Season in January
The average accumulated growing degree days in Ko Olina are rapidly increasing during January, increasing by 671°F, from 1°F to 672°F, over the course of the month.
Growing Degree Days in January
The average daily incident shortwave solar energy in Ko Olina is gradually increasing during January, rising by 0.5 kWh, from 4.4 kWh to 5.0 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Ko Olina are 21.340 deg latitude, -158.126 deg longitude, and 13 ft elevation.
The topography within 2 miles of Ko Olina contains very significant variations in elevation, with a maximum elevation change of 1,083 feet and an average elevation above sea level of 124 feet. Within 10 miles contains very significant variations in elevation (3,196 feet). Within 50 miles contains large variations in elevation (4,098 feet).
The area within 2 miles of Ko Olina is covered by water (39%), shrubs (30%), artificial surfaces (16%), and grassland (15%), within 10 miles by water (59%) and artificial surfaces (15%), and within 50 miles by water (92%).
This report illustrates the typical weather in Ko Olina year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Ko Olina.
For each station, the records are corrected for the elevation difference between that station and Ko Olina according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Ko Olina is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Ko Olina and a given station.
The stations contributing to this reconstruction are: Kalaeloa Airport (47%, 7 kilometers, southeast); Kalaeloa Airport (John Rodgers Field) (47%, 7 kilometers, southeast); Wheeler Army Airfield (4.6%, 19 kilometers, northeast); and Lihue Airport (0.5%, 145 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .