Winter Weather in Adamstown Pitcairn Islands

Daily high temperatures are around 72°F, rarely falling below 68°F or exceeding 76°F.

Daily low temperatures are around 70°F, rarely falling below 66°F or exceeding 74°F.

For reference, on February 28, the hottest day of the year, temperatures in Adamstown typically range from 77°F to 78°F, while on September 4, the coldest day of the year, they range from 69°F to 70°F.

The figure below shows you a compact characterization of the hourly average winter temperatures. 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.

Playas, Ecuador (3,652 miles away) and Vila da Ribeira Brava, Cape Verde (7,674 miles) are the far-away foreign places with temperatures most similar to Adamstown (view comparison).

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The winter in Adamstown experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 60% to 49%. The lowest chance of overcast or mostly cloudy conditions is 47% on August 26.

The clearest day of the winter is August 26, with clear, mostly clear, or partly cloudy conditions 53% of the time.

For reference, on November 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 71%, while on August 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 53%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Adamstown, the chance of a wet day over the course of the winter is gradually decreasing, starting the season at 29% and ending it at 26%.

For reference, the year's highest daily chance of a wet day is 35% on December 11, and its lowest chance is 24% on February 25.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the winter in Adamstown is decreasing, starting the season at 4.1 inches, when it rarely exceeds 7.2 inches or falls below 1.3 inches, and ending the season at 3.5 inches, when it rarely exceeds 6.9 inches or falls below 0.5 inches.

The lowest average 31-day accumulation is 3.4 inches on July 13.

Over the course of the winter in Adamstown, the length of the day is increasing. From the start to the end of the season, the length of the day increases by 56 minutes, implying an average daily increase of 37 seconds, and weekly increase of 4 minutes, 19 seconds.

The shortest day of the winter is June 20, with 10 hours, 35 minutes of daylight and the longest day is August 31, with 11 hours, 36 minutes of daylight.

The latest sunrise of the winter in Adamstown is 7:26 AM on July 2 and the earliest sunrise is 34 minutes earlier at 6:52 AM on August 31.

The earliest sunset is 5:58 PM on June 6 and the latest sunset is 31 minutes later at 6:28 PM on August 31.

Daylight saving time is not observed in Adamstown during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:47 AM and sets 13 hours, 42 minutes later, at 7:29 PM, while on June 20, the shortest day of the year, it rises at 7:24 AM and sets 10 hours, 35 minutes later, at 5:59 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the winter of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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 Adamstown is very rapidly decreasing during the winter, falling from 53% to 31% over the course of the season.

The lowest chance of a muggy day during the winter is 30% on August 29.

For reference, on February 27, the muggiest day of the year, there are muggy conditions 99% of the time, while on August 21, the least muggy day of the year, there are muggy conditions 30% of the time.

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 is essentially constant during the winter, remaining within 0.7 miles per hour of 14.8 miles per hour throughout.

For reference, on July 30, the windiest day of the year, the daily average wind speed is 15.5 miles per hour, while on February 26, the calmest day of the year, the daily average wind speed is 12.2 miles per hour.

The highest daily average wind speed during the winter is 15.5 miles per hour on July 30.

The wind direction in Adamstown during the winter is predominantly out of the east from June 1 to June 23 and from June 26 to August 31 and the north from June 23 to June 26.

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 surface water temperature in Adamstown is gradually decreasing during the winter, falling by 3°F, from 75°F to 72°F, over the course of the 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.

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 Adamstown are very rapidly decreasing during the winter, decreasing by 6,669°F, from 7,884°F to 1,215°F, over the course of the season.

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 Adamstown is increasing during the winter, rising by 1.4 kWh, from 3.2 kWh to 4.6 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 3.0 kWh on June 26.

For the purposes of this report, the geographical coordinates of Adamstown are -25.066 deg latitude, -130.101 deg longitude, and 220 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%).