Summer Weather in British Indian Ocean Territory British Indian Ocean Territory

Daily high temperatures are around 87°F, rarely falling below 82°F or exceeding 91°F.

Daily low temperatures are around 78°F, rarely falling below 75°F or exceeding 81°F.

For reference, on March 24, the hottest day of the year, temperatures in British Indian Ocean Territory typically range from 79°F to 88°F, while on August 10, the coldest day of the year, they range from 76°F to 84°F.

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

© OpenStreetMap contributors

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The summer in British Indian Ocean Territory experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 75% throughout the season. The highest chance of overcast or mostly cloudy conditions is 79% on January 28.

The clearest day of the summer is December 2, with clear, mostly clear, or partly cloudy conditions 29% of the time.

For reference, on January 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 38%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In British Indian Ocean Territory, the chance of a wet day over the course of the summer is increasing, starting the season at 51% and ending it at 56%.

For reference, the year's highest daily chance of a wet day is 70% on January 21, and its lowest chance is 28% on July 30.

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 summer in British Indian Ocean Territory is increasing, starting the season at 6.6 inches, when it rarely exceeds 12.0 inches or falls below 1.6 inches, and ending the season at 7.1 inches, when it rarely exceeds 11.9 inches or falls below 2.5 inches.

The highest average 31-day accumulation is 11.1 inches on January 15.

Over the course of the summer in British Indian Ocean Territory, the length of the day is essentially constant. The shortest day of the summer is February 28, with 12 hours, 13 minutes of daylight and the longest day is December 21, with 12 hours, 28 minutes of daylight.

The earliest sunrise of the summer in British Indian Ocean Territory is 6:47 AM on December 1 and the latest sunrise is 30 minutes later at 7:17 AM on February 25.

The earliest sunset is 7:14 PM on December 1 and the latest sunset is 22 minutes later at 7:36 PM on January 31.

Daylight saving time is not observed in British Indian Ocean Territory during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 6:55 AM and sets 12 hours, 28 minutes later, at 7:24 PM, while on June 20, the shortest day of the year, it rises at 7:20 AM and sets 11 hours, 47 minutes later, at 7:06 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 summer 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 British Indian Ocean Territory is essentially constant during the summer, remaining around 100% throughout.

For reference, on January 11, the muggiest day of the year, there are muggy conditions 100% of the time, while on July 25, the least muggy day of the year, there are muggy conditions 97% 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 British Indian Ocean Territory is essentially constant during the summer, remaining within 1.2 miles per hour of 10.4 miles per hour throughout.

For reference, on August 8, the windiest day of the year, the daily average wind speed is 17.7 miles per hour, while on April 4, the calmest day of the year, the daily average wind speed is 8.5 miles per hour.

The wind direction in British Indian Ocean Territory during the summer is predominantly out of the east from December 1 to December 10 and the west from December 10 to February 28.

British Indian Ocean Territory 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 British Indian Ocean Territory is essentially constant during the summer, remaining around 83°F throughout.

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 British Indian Ocean Territory 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 British Indian Ocean Territory are very rapidly increasing during the summer, increasing by 2,819°F, from 4,648°F to 7,466°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 British Indian Ocean Territory is essentially constant during the summer, remaining within 0.4 kWh of 5.1 kWh throughout.

The lowest average daily incident shortwave solar energy during the summer is 4.7 kWh on January 28.

For the purposes of this report, the geographical coordinates of British Indian Ocean Territory are -6.000 deg latitude, 72.000 deg longitude, and 0 ft elevation.

The topography within 2 miles of British Indian Ocean Territory is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of British Indian Ocean Territory is covered by water (100%), within 10 miles by water (100%), and within 50 miles by water (100%).