Average Weather in April in Royal Kunia Hawaii, United States
Daily high temperatures are around 81°F, rarely falling below 78°F or exceeding 85°F.
Daily low temperatures are around 68°F, rarely falling below 63°F or exceeding 71°F.
For reference, on August 21, the hottest day of the year, temperatures in Royal Kunia typically range from 73°F to 87°F, while on January 28, the coldest day of the year, they range from 65°F to 79°F.
Average High and Low Temperature in April
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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 April
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.
The month of April in Royal Kunia experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 32% throughout the month. The highest chance of overcast or mostly cloudy conditions is 34% on April 25.
The clearest day of the month is April 12, with clear, mostly clear, or partly cloudy conditions 70% 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 April
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Royal Kunia, the chance of a wet day over the course of April is essentially constant, remaining around 14% throughout.
For reference, the year's highest daily chance of a wet day is 26% on January 11, and its lowest chance is 7% on June 20.
Probability of Precipitation in April
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during April in Royal Kunia is gradually decreasing, starting the month at 1.7 inches, when it rarely exceeds 3.7 inches, and ending the month at 1.3 inches, when it rarely exceeds 3.8 inches.
Average Monthly Rainfall in April
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.
Over the course of April in Royal Kunia, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 33 minutes, implying an average daily increase of 1 minute, 9 seconds, and weekly increase of 8 minutes, 4 seconds.
The shortest day of the month is April 1, with 12 hours, 22 minutes of daylight and the longest day is April 30, with 12 hours, 56 minutes of daylight.
Hours of Daylight and Twilight in April
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
The latest sunrise of the month in Royal Kunia is 6:24 AM on April 1 and the earliest sunrise is 23 minutes earlier at 6:01 AM on April 30.
The earliest sunset is 6:47 PM on April 1 and the latest sunset is 10 minutes later at 6:57 PM on April 30.
Daylight saving time is not observed in Royal Kunia during 2018.
For reference, on June 21, the longest day of the year, the Sun rises at 5:50 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 April
The solar day over the course of April. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Royal Kunia is gradually increasing during April, rising from 18% to 21% over the course of the month.
For reference, on September 26, the muggiest day of the year, there are muggy conditions 71% of the time, while on March 9, the least muggy day of the year, there are muggy conditions 17% of the time.
Humidity Comfort Levels in April
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Royal Kunia is essentially constant during April, remaining within 0.3 miles per hour of 15.1 miles per hour throughout.
For reference, on July 3, the windiest day of the year, the daily average wind speed is 16.6 miles per hour, while on January 10, the calmest day of the year, the daily average wind speed is 12.3 miles per hour.
The highest daily average wind speed during April is 15.4 miles per hour on April 8.
Average Wind Speed in April
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The hourly average wind direction in Royal Kunia throughout April is predominantly from the east, with a peak proportion of 81% on April 29.
Wind Direction in April
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).
Royal Kunia 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 Royal Kunia is essentially constant during April, remaining around 76°F throughout.
Average Water Temperature in April
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
Temperatures in Royal Kunia 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 April
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing season.
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days in Royal Kunia are rapidly increasing during April, increasing by 688°F, from 1,946°F to 2,633°F, over the course of the month.
Growing Degree Days in April
The average growing degree days accumulated over the course of April, with 25th to 75th and 10th to 90th percentile bands.
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Royal Kunia is gradually increasing during April, rising by 0.6 kWh, from 6.7 kWh to 7.2 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in April
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
For the purposes of this report, the geographical coordinates of Royal Kunia are 21.394 deg latitude, -158.027 deg longitude, and 276 ft elevation.
The topography within 2 miles of Royal Kunia contains significant variations in elevation, with a maximum elevation change of 620 feet and an average elevation above sea level of 269 feet. Within 10 miles contains significant variations in elevation (3,415 feet). Within 50 miles also contains extreme variations in elevation (4,121 feet).
The area within 2 miles of Royal Kunia is covered by artificial surfaces (61%), cropland (17%), and grassland (12%), within 10 miles by trees (30%) and artificial surfaces (27%), and within 50 miles by water (92%).
This report illustrates the typical weather in Royal Kunia 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 Royal Kunia.
The estimated value at Royal Kunia is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Royal Kunia and a given station.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.