Average Weather in Adamstown Pitcairn Islands
The climate in Adamstown is comfortable, muggy, windy, and mostly cloudy. Over the course of the year, the temperature typically varies from 69°F to 78°F and is rarely below 66°F or above 80°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Adamstown, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Adamstown begins around June 16 and lasts for 3.3 months, ending around September 26. On August 26, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 53% of the time, and overcast or mostly cloudy 47% of the time.
The cloudier part of the year begins around September 26 and lasts for 8.7 months, ending around June 16. On December 1, the cloudiest day of the year, the sky is overcast or mostly cloudy 71% of the time, and clear, mostly clear, or partly cloudy 29% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Adamstown varies throughout the year.
The wetter season lasts 7.9 months, from May 3 to January 1, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 35% on December 11.
The drier season lasts 4.1 months, from January 1 to May 3. The smallest chance of a wet day is 24% on February 25.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 35% on December 11.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Adamstown experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Adamstown. The most rain falls during the 31 days centered around December 10, with an average total accumulation of 5.7 inches.
The least rain falls around March 9, with an average total accumulation of 3.0 inches.
Average Monthly Rainfall
The length of the day in Adamstown varies over the course of the year. In 2017, the shortest day is June 20, with 10 hours, 35 minutes of daylight; the longest day is December 21, with 13 hours, 42 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:42 AM on November 30, and the latest sunrise is 1 hour, 44 minutes later at 7:26 AM on July 3. The earliest sunset is at 5:58 PM on June 8, and the latest sunset is 1 hour, 37 minutes later at 7:35 PM on January 11.
Daylight saving time (DST) is not observed in Adamstown during 2017.
Sunrise & Sunset with Twilight
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.
Adamstown experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 8.3 months, from October 15 to June 23, during which time the comfort level is muggy, oppressive, or miserable at least 48% of the time. The muggiest day of the year is March 3, with muggy conditions 99% of the time.
The least muggy day of the year is August 30, with muggy conditions 30% of the time.
Humidity Comfort Levels
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 Adamstown experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 4.9 months, from May 24 to October 21, with average wind speeds of more than 7.5 miles per hour. The windiest day of the year is July 31, with an average hourly wind speed of 8.4 miles per hour.
The calmer time of year lasts for 7.1 months, from October 21 to May 24. The calmest day of the year is February 27, with an average hourly wind speed of 6.6 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Adamstown varies throughout the year.
The wind is most often from the north for 3.0 days, from June 19 to June 22 and for 3.0 days, from June 24 to June 27, with a peak percentage of 31% on June 20. The wind is most often from the east for 2.0 days, from June 22 to June 24 and for 12 months, from June 27 to June 19, with a peak percentage of 30% on June 22.
Adamstown 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 water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.3 months, from January 8 to April 18, with an average temperature above 78°F. The day of the year with the warmest water is March 1, with an average temperature of 80°F.
The time of year with cooler water lasts for 4.1 months, from June 30 to November 2, with an average temperature below 73°F. The day of the year with the coolest water is September 7, with an average temperature of 72°F.
Average Water Temperature
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 experiences significant seasonal variation over the course of the year.
The brighter period of the year lasts for 4.2 months, from October 28 to March 2, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is January 14, with an average of 6.8 kWh.
The darker period of the year lasts for 3.2 months, from May 3 to August 8, with an average daily incident shortwave energy per square meter below 3.8 kWh. The darkest day of the year is June 27, with an average of 3.0 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Adamstown are -25.066 deg latitude, -130.101 deg longitude, and 0 ft elevation.
The topography within 2 miles of Adamstown contains very significant variations in elevation, with a maximum elevation change of 1,047 feet and an average elevation above sea level of 64 feet. Within 10 miles also contains very significant variations in elevation (1,047 feet). Within 50 miles also contains very significant variations in elevation (1,047 feet).
The area within 2 miles of Adamstown 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 Adamstown, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Adamstown is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . 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 temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Adamstown, according to the International Standard Atmosphere .
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.