Daily high temperatures decrease by 3°F, from 76°F to 72°F, rarely falling below 69°F or exceeding 78°F.
Daily low temperatures decrease by 2°F, from 67°F to 65°F, rarely falling below 61°F or exceeding 71°F.
For reference, on February 12, the hottest day of the year, temperatures in Hanga Roa typically range from 71°F to 81°F, while on August 15, the coldest day of the year, they range from 62°F to 70°F.
Average High and Low Temperature in May
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 May. 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 May
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 May in Hanga Roa experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 54% to 58%.
The clearest day of the month is May 1, with clear, mostly clear, or partly cloudy conditions 46% of the time.
For reference, on June 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on February 5, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.
Cloud Cover Categories in May
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 Hanga Roa, the chance of a wet day over the course of May is essentially constant, remaining around 25% throughout.
For reference, the year's highest daily chance of a wet day is 27% on June 5, and its lowest chance is 5% on February 5.
Probability of Precipitation in May
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 May in Hanga Roa is essentially constant, remaining about 3.0 inches throughout, and rarely exceeding 5.7 inches or falling below 0.6 inches.
The highest average 31-day accumulation is 3.1 inches on May 24.
Average Monthly Rainfall in May
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 May in Hanga Roa, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 31 minutes, implying an average daily decrease of 1 minute, 2 seconds, and weekly decrease of 7 minutes, 11 seconds.
The shortest day of the month is May 31, with 10 hours, 33 minutes of daylight and the longest day is May 1, with 11 hours, 3 minutes of daylight.
Hours of Daylight and Twilight in May
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 Hanga Roa is 8:48 AM on May 12 and the earliest sunrise is 59 minutes earlier at 7:49 AM on May 13.
The latest sunset is 7:46 PM on May 1 and the earliest sunset is 1 hour, 15 minutes earlier at 6:31 PM on May 31.
Daylight saving time (DST) ends at 9:00 PM on May 12, 2018, shifting sunrise and sunset to be an hour earlier.
For reference, on December 21, the longest day of the year, the Sun rises at 7:20 AM and sets 13 hours, 51 minutes later, at 9:11 PM, while on June 21, the shortest day of the year, it rises at 8:06 AM and sets 10 hours, 26 minutes later, at 6:32 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in May
The solar day over the course of May. 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. The transitions to and from daylight saving time are indicated by the 'DST' labels.
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 Hanga Roa is rapidly decreasing during May, falling from 38% to 19% over the course of the month.
For reference, on February 9, the muggiest day of the year, there are muggy conditions 80% of the time, while on August 9, the least muggy day of the year, there are muggy conditions 5% of the time.
Humidity Comfort Levels in May
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 Hanga Roa is gradually increasing during May, increasing from 13.8 miles per hour to 14.5 miles per hour over the course of the month.
For reference, on July 24, the windiest day of the year, the daily average wind speed is 15.4 miles per hour, while on January 17, the calmest day of the year, the daily average wind speed is 11.6 miles per hour.
Average Wind Speed in May
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 Hanga Roa throughout May is predominantly from the east, with a peak proportion of 36% on May 1.
Wind Direction in May
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).
Hanga Roa 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 Hanga Roa is gradually decreasing during May, falling by 2°F, from 75°F to 72°F, over the course of the month.
Average Water Temperature in May
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 Hanga Roa 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 May
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 Hanga Roa are rapidly increasing during May, increasing by 587°F, from 6,188°F to 6,775°F, over the course of the month.
Growing Degree Days in May
The average growing degree days accumulated over the course of May, 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 Hanga Roa is gradually decreasing during May, falling by 0.9 kWh, from 3.9 kWh to 3.0 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in May
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 Hanga Roa are -27.155 deg latitude, -109.432 deg longitude, and 0 ft elevation.
The topography within 2 miles of Hanga Roa contains very significant variations in elevation, with a maximum elevation change of 961 feet and an average elevation above sea level of 193 feet. Within 10 miles also contains very significant variations in elevation (1,647 feet). Within 50 miles also contains very significant variations in elevation (1,647 feet).
The area within 2 miles of Hanga Roa is covered by water (100%), within 10 miles by water (100%), and within 50 miles by water (100%).
This report illustrates the typical weather in Hanga Roa 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 is only a single weather station, Mataveri International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Hanga Roa.
At a distance of 2 kilometer from Hanga Roa, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
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.