Average Weather in Vouani Comoros

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2. Comoros
3. Anjouan
4. Vouani

In Vouani, the wet season is hot and mostly cloudy; the dry season is warm, windy, and mostly clear; and it is oppressive year round. Over the course of the year, the temperature typically varies from 69°F to 85°F and is rarely below 67°F or above 88°F.

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.

In Vouani, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Vouani begins around April 12 and lasts for 7.6 months, ending around November 29. On August 22, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 88% of the time, and overcast or mostly cloudy 12% of the time.

The cloudier part of the year begins around November 29 and lasts for 4.4 months, ending around April 12. On January 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 82% of the time, and clear, mostly clear, or partly cloudy 18% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Vouani varies very significantly throughout the year.

The wetter season lasts 4.1 months, from December 14 to April 16, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 55% on February 3.

The drier season lasts 7.9 months, from April 16 to December 14. The smallest chance of a wet day is 4% on September 9.

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 55% on February 3.

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. Vouani experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.0 months, from October 29 to July 28, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around January 26, with an average total accumulation of 6.6 inches.

The rainless period of the year lasts for 3.0 months, from July 28 to October 29. The least rain falls around September 9, with an average total accumulation of 0.3 inches.

The length of the day in Vouani does not vary substantially over the course of the year, staying within 50 minutes of 12 hours throughout. In 2017, the shortest day is June 21, with 11 hours, 24 minutes of daylight; the longest day is December 21, with 12 hours, 51 minutes of daylight.

The earliest sunrise is at 5:26 AM on November 19, and the latest sunrise is 58 minutes later at 6:24 AM on July 12. The earliest sunset is at 5:43 PM on May 30, and the latest sunset is 52 minutes later at 6:35 PM on January 23.

Daylight saving time (DST) is not observed in Vouani during 2017.

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.

Vouani experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 10 months, from August 24 to June 30, during which time the comfort level is muggy, oppressive, or miserable at least 89% of the time. The muggiest day of the year is February 2, with muggy conditions 100% of the time.

The least muggy day of the year is July 20, with muggy conditions 85% 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 Vouani experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 3.4 months, from April 30 to August 12, with average wind speeds of more than 5.2 miles per hour. The windiest day of the year is June 24, with an average hourly wind speed of 6.4 miles per hour.

The calmer time of year lasts for 8.6 months, from August 12 to April 30. The calmest day of the year is March 26, with an average hourly wind speed of 4.1 miles per hour.

The predominant average hourly wind direction in Vouani varies throughout the year.

The wind is most often from the east for 1.1 months, from March 8 to April 11 and for 3.3 months, from September 4 to December 14, with a peak percentage of 72% on October 25. The wind is most often from the south for 4.8 months, from April 11 to September 4, with a peak percentage of 78% on July 14. The wind is most often from the north for 2.8 months, from December 14 to March 8, with a peak percentage of 55% on January 1.

Vouani 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 4.6 months, from December 17 to May 5, with an average temperature above 84°F. The day of the year with the warmest water is March 27, with an average temperature of 85°F.

The time of year with cooler water lasts for 3.2 months, from July 5 to October 11, with an average temperature below 79°F. The day of the year with the coolest water is August 17, with an average temperature of 78°F.

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 some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.5 months, from September 16 to December 1, with an average daily incident shortwave energy per square meter above 6.8 kWh. The brightest day of the year is October 26, with an average of 7.3 kWh.

The darker period of the year lasts for 3.1 months, from January 1 to April 4, with an average daily incident shortwave energy per square meter below 5.5 kWh. The darkest day of the year is February 23, with an average of 5.0 kWh.

For the purposes of this report, the geographical coordinates of Vouani are -12.244 deg latitude, 44.374 deg longitude, and 515 ft elevation.

The topography within 2 miles of Vouani contains large variations in elevation, with a maximum elevation change of 2,848 feet and an average elevation above sea level of 685 feet. Within 10 miles contains large variations in elevation (5,210 feet). Within 50 miles also contains extreme variations in elevation (5,253 feet).

The area within 2 miles of Vouani is covered by trees (55%) and water (40%), within 10 miles by water (62%) and trees (19%), and within 50 miles by water (97%).

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

Temperature and Dew Point

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Vouani.

For each station, the records are corrected for the elevation difference between that station and Vouani according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Vouani is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Vouani and a given station.

The stations contributing to this reconstruction are: Dzaoudzi Pamandzi International Airport (58%, 117 kilometers, southeast) and Prince Said Ibrahim International Airport (42%, 144 kilometers, northwest).

Other Data

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.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . 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.

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.