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Average Weather in Adamstown Pitcairn Islands

In Adamstown, the summers are warm, oppressive, and mostly cloudy; the winters are long, comfortable, humid, wet, and partly cloudy; and it is windy year round. 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.

Climate Summary

53%53%29%29%overcastclearprecipitation: 5.7 inprecipitation: 5.7 in3.0 in3.0 inmuggy: 99%muggy: 99%30%30%warmcomfortabletourism score: 7.1tourism score: 7.15.75.7JanFebMarAprMayJunJulAugSepOctNovDec
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Adamstown for warm-weather activities is from mid May to late September.

Temperature

The warm season lasts for 3.3 months, from January 6 to April 16, with an average daily high temperature above 77°F. The hottest day of the year is February 28, with an average high of 78°F and low of 77°F.

The cool season lasts for 3.8 months, from July 1 to October 26, with an average daily high temperature below 72°F. The coldest day of the year is September 5, with an average low of 69°F and high of 70°F.

Average High and Low Temperature

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 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

Average Hourly Temperature in AdamstownJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMwarmcomfortable
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.

Clouds

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 17 and lasts for 3.3 months, ending around September 25. 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 25 and lasts for 8.7 months, ending around June 17. 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

Cloud Cover Categories in AdamstownclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 2653%Aug 2653%Dec 129%Dec 129%Jun 1740%Jun 1740%Sep 2541%Sep 2541%partly cloudymostly cloudyclearovercastmostly clear
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.

Precipitation

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 8.0 months, from May 2 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 4.0 months, from January 1 to May 2. 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

Daily Chance of Precipitation in AdamstownwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 1135%Dec 1135%Feb 2524%Feb 2524%May 230%May 230%rain
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).

Rainfall

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 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.

Sun

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 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 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

Sunrise & Sunset with Twilight in AdamstownJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNov 305:42 AMNov 305:42 AM7:35 PMJan 117:35 PMJan 11Jun 85:58 PMJun 85:58 PM7:26 AMJul 37:26 AMJul 3daynightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. 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.

Humidity

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 14 to June 24, during which time the comfort level is muggy, oppressive, or miserable at least 47% 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

Humidity Comfort Levels in AdamstownmuggymuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 3030%Aug 3030%99%Mar 399%Mar 3Oct 1447%Oct 1447%Jun 2447%Jun 2447%humidhumidmuggymuggyoppressiveoppressivecomfortablecomfortabledrydry
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.

Wind

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 significant seasonal variation over the course of the year.

The windier part of the year lasts for 4.9 months, from May 25 to October 20, with average wind speeds of more than 13.9 miles per hour. The windiest day of the year is July 31, with an average hourly wind speed of 15.5 miles per hour.

The calmer time of year lasts for 7.1 months, from October 20 to May 25. The calmest day of the year is February 26, with an average hourly wind speed of 12.2 miles per hour.

Average Wind Speed

Average Wind Speed in AdamstownwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mph22 mphJul 3115.5 mphJul 3115.5 mphFeb 2612.2 mphFeb 2612.2 mphMay 2513.9 mphMay 2513.9 mphOct 2013.9 mphOct 2013.9 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

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 24 to June 27, with a peak percentage of 31% on June 24. The wind is most often from the east for 12 months, from June 27 to June 24, with a peak percentage of 57% on January 1.

Wind Direction

Wind Direction in AdamstownEEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%northeastwestsouth
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).

Water Temperature

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 9 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 4.0 months, from June 30 to November 1, 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

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Adamstown throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Adamstown for general outdoor tourist activities is from mid May to late September, with a peak score in the last week of August.

Tourism Score

Tourism Score in Adamstownbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.17.15.75.76.46.4 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Adamstown for hot-weather activities is from early January to late April, with a peak score in the last week of February.

Beach/Pool Score

Beach/Pool Score in Adamstownbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.66.64.24.2 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

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 Adamstown 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

Time Spent in Various Temperature Bands and the Growing Season in AdamstownJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%100%Jan 1100%Jan 1100%Jul 3100%Jul 3comfortablewarmcool
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.

Growing Degree Days

Growing Degree Days in AdamstownJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°F6,000°F7,000°F8,000°FDec 313,906°FDec 313,906°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 4.1 months, from October 29 to March 1, 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 3.1 months, from May 4 to August 7, 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

Average Daily Incident Shortwave Solar Energy in AdamstownbrightbrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJan 146.8 kWhJan 146.8 kWhJun 273.0 kWhJun 273.0 kWhOct 296.0 kWhOct 296.0 kWhMar 16.0 kWhMar 16.0 kWhMay 43.8 kWhMay 43.8 kWhAug 73.8 kWhAug 73.8 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

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%).

Data Sources

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.

Disclaimer

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.