Average Weather in Ziroudani Comoros

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In Ziroudani, 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 68°F to 86°F and is rarely below 66°F or above 89°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 Ziroudani, 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 Ziroudani begins around April 11 and lasts for 7.6 months, ending around November 30. On August 20, 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 30 and lasts for 4.4 months, ending around April 11. On February 13, 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 Ziroudani varies very significantly throughout the year.

The wetter season lasts 4.0 months, from December 15 to April 15, with a greater than 29% 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 8.0 months, from April 15 to December 15. The smallest chance of a wet day is 3% on September 11.

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. Ziroudani experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.8 months, from November 5 to July 30, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around January 27, with an average total accumulation of 6.5 inches.

The rainless period of the year lasts for 3.2 months, from July 30 to November 5. The least rain falls around September 23, with an average total accumulation of 0.2 inches.

The length of the day in Ziroudani does not vary substantially over the course of the year, staying within 51 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 5:28 AM on November 20, and the latest sunrise is 58 minutes later at 6:27 AM on July 11. The earliest sunset is at 5:46 PM on May 30, and the latest sunset is 52 minutes later at 6:38 PM on January 23.

Daylight saving time (DST) is not observed in Ziroudani 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.

Ziroudani experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 9.7 months, from September 1 to June 23, during which time the comfort level is muggy, oppressive, or miserable at least 85% of the time. The muggiest day of the year is February 22, with muggy conditions 100% of the time.

The least muggy day of the year is August 15, with muggy conditions 79% 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 Ziroudani experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 3.6 months, from April 28 to August 16, with average wind speeds of more than 5.5 miles per hour. The windiest day of the year is July 4, with an average hourly wind speed of 7.0 miles per hour.

The calmer time of year lasts for 8.4 months, from August 16 to April 28. The calmest day of the year is March 25, with an average hourly wind speed of 4.1 miles per hour.

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

The wind is most often from the east for 1.0 months, from March 8 to April 8 and for 3.2 months, from September 8 to December 14, with a peak percentage of 68% on October 25. The wind is most often from the south for 5.0 months, from April 8 to September 8, with a peak percentage of 80% on June 10. The wind is most often from the north for 2.8 months, from December 14 to March 8, with a peak percentage of 54% on January 1.

Ziroudani 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 4.7 months, from December 14 to May 4, with an average temperature above 84°F. The day of the year with the warmest water is March 25, with an average temperature of 85°F.

The time of year with cooler water lasts for 3.1 months, from July 4 to October 8, with an average temperature below 79°F. The day of the year with the coolest water is August 14, 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 17 to December 2, with an average daily incident shortwave energy per square meter above 6.8 kWh. The brightest day of the year is October 28, with an average of 7.3 kWh.

The darker period of the year lasts for 3.2 months, from January 1 to April 6, 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 Ziroudani are -12.333 deg latitude, 43.778 deg longitude, and 571 ft elevation.

The topography within 2 miles of Ziroudani contains very significant variations in elevation, with a maximum elevation change of 1,647 feet and an average elevation above sea level of 783 feet. Within 10 miles contains very significant variations in elevation (2,605 feet). Within 50 miles contains large variations in elevation (7,782 feet).

The area within 2 miles of Ziroudani is covered by cropland (49%) and trees (37%), within 10 miles by water (76%) and cropland (11%), and within 50 miles by water (96%).

This report illustrates the typical weather in Ziroudani, 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 is only a single weather station, Prince Said Ibrahim International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Ziroudani.

At a distance of 105 kilometers from Ziroudani, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

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

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

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.