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Spring Weather in British Indian Ocean Territory British Indian Ocean Territory

Daily high temperatures are around 85°F, rarely falling below 81°F or exceeding 90°F.

Daily low temperatures are around 77°F, rarely falling below 75°F or exceeding 80°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.

Average High and Low Temperature in the Spring in British Indian Ocean Territory

Average High and Low Temperature in the Spring in British Indian Ocean TerritorySepOctNov74°F74°F76°F76°F78°F78°F80°F80°F82°F82°F84°F84°F86°F86°F88°F88°F90°F90°F92°F92°F94°F94°F96°F96°F98°F98°F100°F100°FWinterSummerSep 184°FSep 184°F77°F77°FNov 3087°FNov 3087°F78°F78°FOct 185°FOct 185°F77°F77°FNov 186°FNov 186°F78°F78°F
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 spring 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.

Average Hourly Temperature in the Spring in British Indian Ocean Territory

Average Hourly Temperature in the Spring in British Indian Ocean TerritorySepOctNov12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMWinterSummerwarmhot
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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The spring in British Indian Ocean Territory experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 66% to 71%.

The clearest day of the spring is September 1, with clear, mostly clear, or partly cloudy conditions 34% 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%.

Cloud Cover Categories in the Spring in British Indian Ocean Territory

Cloud Cover Categories in the Spring in British Indian Ocean TerritorySepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummerSep 134%Sep 134%Nov 3029%Nov 3029%Oct 130%Oct 130%Nov 129%Nov 129%mostly clearpartly cloudymostly cloudyovercastclear
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

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 spring is very rapidly increasing, starting the season at 40% and ending it at 51%.

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.

Probability of Precipitation in the Spring in British Indian Ocean Territory

Probability of Precipitation in the Spring in British Indian Ocean TerritorySepOctNov0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%WinterSummerSep 140%Sep 140%Nov 3051%Nov 3051%Oct 153%Oct 153%Nov 158%Nov 158%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 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 spring in British Indian Ocean Territory is very rapidly increasing, starting the season at 4.4 inches, when it rarely exceeds 8.1 inches or falls below 1.0 inches, and ending the season at 6.6 inches, when it rarely exceeds 11.9 inches or falls below 1.7 inches.

Average Monthly Rainfall in the Spring in British Indian Ocean Territory

Average Monthly Rainfall in the Spring in British Indian Ocean TerritorySepOctNov0 in0 in5 in5 in10 in10 in15 in15 inWinterSummerSep 14.4 inSep 14.4 inNov 306.6 inNov 306.6 inOct 17.3 inOct 17.3 inNov 17.5 inNov 17.5 in
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 snowfall.

Over the course of the spring in British Indian Ocean Territory, the length of the day is gradually increasing. From the start to the end of the season, the length of the day increases by 27 minutes, implying an average daily increase of 18 seconds, and weekly increase of 2 minutes, 5 seconds.

The shortest day of the spring is September 1, with 12 hours, 0 minutes of daylight and the longest day is November 30, with 12 hours, 27 minutes of daylight.

Hours of Daylight and Twilight in the Spring in British Indian Ocean Territory

Hours of Daylight and Twilight in the Spring in British Indian Ocean TerritorySepOctNov0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrWinterSummerSep 2212 hr, 6 minSep 2212 hr, 6 mindaydaydaydaynightSep 112 hr, 0 minSep 112 hr, 0 minNov 3012 hr, 27 minNov 3012 hr, 27 minNov 112 hr, 19 minNov 112 hr, 19 min
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 spring in British Indian Ocean Territory is 7:12 AM on September 1 and the earliest sunrise is 27 minutes earlier at 6:44 AM on November 12.

The earliest sunset is 7:04 PM on October 20 and the latest sunset is 9 minutes later at 7:14 PM on November 30.

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.

Sunrise & Sunset with Twilight in the Spring in British Indian Ocean Territory

Sunrise & Sunset with Twilight in the Spring in British Indian Ocean TerritorySepOctNov2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMWinterSummer6:44 AM6:44 AMNov 127:07 PMNov 127:07 PM6:47 AM6:47 AMNov 307:14 PMNov 307:14 PM6:48 AM6:48 AMOct 207:04 PMOct 207:04 PM7:12 AM7:12 AMSep 17:11 PMSep 17:11 PM6:56 AM6:56 AMOct 17:06 PMOct 17:06 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the spring. 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 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.

Solar Elevation and Azimuth in the Spring in British Indian Ocean Territory

Solar Elevation and Azimuth in the Spring in British Indian Ocean TerritorySepOctNov12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMWinterSummer001020203030405050606070800010102030304040506060707080
northeastsouthwest
Solar elevation and azimuth in the the spring of 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for the spring 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.

Moon Rise, Set & Phases in the Spring in British Indian Ocean Territory

Moon Rise, Set & Phases in the Spring in British Indian Ocean TerritorySepOctNov12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMWinterSummerAug 45:14 PMAug 45:14 PMAug 2012:26 AMAug 2012:26 AMSep 37:56 AMSep 37:56 AMSep 188:35 AMSep 188:35 AMOct 312:50 AMOct 312:50 AMOct 175:27 PMOct 175:27 PMNov 16:48 PMNov 16:48 PMNov 163:29 AMNov 163:29 AMDec 112:22 PMDec 112:22 PMDec 153:02 PMDec 153:02 PMDec 314:28 AMDec 314:28 AM7:17 PM7:17 PM7:00 PM7:00 PM7:41 AM7:41 AM7:30 PM7:30 PM6:35 PM6:35 PM7:05 AM7:05 AM6:31 AM6:31 AM6:52 PM6:52 PM7:03 PM7:03 PM7:18 AM7:18 AM6:23 AM6:23 AM6:59 PM6:59 PM6:40 PM6:40 PM6:50 AM6:50 AM6:34 AM6:34 AM7:25 PM7:25 PM7:30 PM7:30 PM7:34 AM7:34 AM8:04 PM8:04 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil 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.

The chance that a given day will be muggy in British Indian Ocean Territory is gradually increasing during the spring, rising from 97% to 100% over the course of the season.

The highest chance of a muggy day during the spring is 100% on November 23. The lowest chance of a muggy day during the spring is 97% on September 16.

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.

Humidity Comfort Levels in the Spring in British Indian Ocean Territory

Humidity Comfort Levels in the Spring in British Indian Ocean TerritorySepOctNov0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%WinterSummerNov 23100%Nov 23100%Sep 1697%Sep 1697%Sep 197%Sep 197%Oct 198%Oct 198%Nov 1100%Nov 1100%miserablemiserableoppressiveoppressivemuggymuggy
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 very rapidly decreasing during the spring, decreasing from 17.1 miles per hour to 9.7 miles per hour over the course of the season.

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.

Average Wind Speed in the Spring in British Indian Ocean Territory

Average Wind Speed in the Spring in British Indian Ocean TerritorySepOctNov0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mphWinterSummerSep 117.1 mphSep 117.1 mphNov 309.7 mphNov 309.7 mphOct 114.7 mphOct 114.7 mphNov 112.2 mphNov 112.2 mph
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 British Indian Ocean Territory throughout the spring is predominantly from the east, with a peak proportion of 67% on September 6.

Wind Direction in the Spring in British Indian Ocean Territory

Wind Direction in the Spring in British Indian Ocean TerritoryEWSepOctNov0%100%20%80%40%60%60%40%80%20%100%0%WinterSummerwesteastsouthnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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 gradually increasing during the spring, rising by 3°F, from 80°F to 83°F, over the course of the season.

Average Water Temperature in the Spring in British Indian Ocean Territory

Average Water Temperature in the Spring in British Indian Ocean TerritorySepOctNov78°F78°F79°F79°F80°F80°F81°F81°F82°F82°F83°F83°F84°F84°F85°F85°FWinterSummerSep 180°FSep 180°FNov 3083°FNov 3083°FOct 181°FOct 181°FNov 182°FNov 182°F
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 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.

Time Spent in Various Temperature Bands and the Growing Season in the Spring in British Indian Ocean Territory

Time Spent in Various Temperature Bands and the Growing Season in the Spring in British Indian Ocean TerritorySepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummer100%Oct 16100%Oct 16warmhot
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 percentage of time spent in various temperature bands. 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 British Indian Ocean Territory are very rapidly increasing during the spring, increasing by 2,774°F, from 1,845°F to 4,619°F, over the course of the season.

Growing Degree Days in the Spring in British Indian Ocean Territory

Growing Degree Days in the Spring in British Indian Ocean TerritorySepOctNov2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°F4,000°F4,000°F4,500°F4,500°FWinterSummerSep 11,845°FSep 11,845°FNov 304,619°FNov 304,619°FOct 12,749°FOct 12,749°FNov 13,704°FNov 13,704°F
The average growing degree days accumulated over the course of the spring, 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 British Indian Ocean Territory is essentially constant during the spring, remaining within 0.1 kWh of 5.4 kWh throughout.

The highest average daily incident shortwave solar energy during the spring is 5.5 kWh on November 1.

Average Daily Incident Shortwave Solar Energy in the Spring in British Indian Ocean Territory

Average Daily Incident Shortwave Solar Energy in the Spring in British Indian Ocean TerritorySepOctNov0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhWinterSummerNov 15.5 kWhNov 15.5 kWhSep 15.4 kWhSep 15.4 kWhNov 305.4 kWhNov 305.4 kWhOct 15.3 kWhOct 15.3 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.

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%).

This report illustrates the typical weather in British Indian Ocean Territory, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

The details of the data sources used for this report can be found on the Diego Garcia page.

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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.

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