Average Weather in Antsohihy Madagascar

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In Antsohihy, the wet season is oppressive and overcast, the dry season is humid and mostly clear, and it is hot year round. Over the course of the year, the temperature typically varies from 65°F to 97°F and is rarely below 62°F or above 101°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 Antsohihy, 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 Antsohihy begins around April 12 and lasts for 7.3 months, ending around November 20. On September 2, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 89% of the time, and overcast or mostly cloudy 11% of the time.

The cloudier part of the year begins around November 20 and lasts for 4.7 months, ending around April 12. On January 20, the cloudiest day of the year, the sky is overcast or mostly cloudy 85% of the time, and clear, mostly clear, or partly cloudy 15% 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 Antsohihy varies very significantly throughout the year.

The wetter season lasts 4.4 months, from November 25 to April 6, with a greater than 46% chance of a given day being a wet day. The chance of a wet day peaks at 89% on February 8.

The drier season lasts 7.6 months, from April 6 to November 25. The smallest chance of a wet day is 1% on August 7.

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 89% on February 8.

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. Antsohihy experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.2 months, from October 8 to May 15, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around January 30, with an average total accumulation of 14.9 inches.

The rainless period of the year lasts for 4.8 months, from May 15 to October 8. The least rain falls around August 14, with an average total accumulation of 0.1 inches.

The length of the day in Antsohihy varies over the course of the year. In 2017, the shortest day is June 21, with 11 hours, 15 minutes of daylight; the longest day is December 21, with 13 hours, 1 minute of daylight.

The earliest sunrise is at 5:08 AM on November 23, and the latest sunrise is 1 hour, 7 minutes later at 6:14 AM on July 9. The earliest sunset is at 5:24 PM on June 1, and the latest sunset is 1 hour, 0 minutes later at 6:25 PM on January 20.

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

Antsohihy experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 8.1 months, from October 7 to June 11, during which time the comfort level is muggy, oppressive, or miserable at least 33% of the time. The muggiest day of the year is February 19, with muggy conditions 100% of the time.

The least muggy day of the year is August 15, with muggy conditions 9% 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 Antsohihy experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.1 months, from May 26 to September 30, with average wind speeds of more than 4.3 miles per hour. The windiest day of the year is July 24, with an average hourly wind speed of 5.8 miles per hour.

The calmer time of year lasts for 7.9 months, from September 30 to May 26. The calmest day of the year is March 24, with an average hourly wind speed of 2.9 miles per hour.

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

The wind is most often from the east for 8.3 months, from March 10 to November 20, with a peak percentage of 91% on July 31. The wind is most often from the west for 3.7 months, from November 20 to March 10, with a peak percentage of 48% on January 1.

Antsohihy 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 5.4 months, from December 2 to May 13, with an average temperature above 84°F. The day of the year with the warmest water is March 29, with an average temperature of 85°F.

The time of year with cooler water lasts for 2.9 months, from July 1 to September 27, with an average temperature below 79°F. The day of the year with the coolest water is August 7, 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 2.2 months, from September 11 to November 16, with an average daily incident shortwave energy per square meter above 6.9 kWh. The brightest day of the year is October 7, with an average of 7.3 kWh.

The darker period of the year lasts for 3.0 months, from April 29 to July 28, with an average daily incident shortwave energy per square meter below 5.6 kWh. The darkest day of the year is June 16, with an average of 5.2 kWh.

For the purposes of this report, the geographical coordinates of Antsohihy are -14.880 deg latitude, 47.988 deg longitude, and 62 ft elevation.

The topography within 2 miles of Antsohihy contains only modest variations in elevation, with a maximum elevation change of 180 feet and an average elevation above sea level of 62 feet. Within 10 miles also contains only modest variations in elevation (489 feet). Within 50 miles contains only modest variations in elevation (5,791 feet).

The area within 2 miles of Antsohihy is covered by grassland (75%) and trees (12%), within 10 miles by grassland (75%) and trees (14%), and within 50 miles by grassland (43%) and trees (25%).

This report illustrates the typical weather in Antsohihy, 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, Majunga, in our network suitable to be used as a proxy for the historical temperature and dew point records of Antsohihy.

At a distance of 196 kilometers from Antsohihy, further than our threshold of 150 kilometers, this station is deemed insufficiently nearby to be relied upon as our primary source for temperature and dew point records. Consequently, the station records are blended with interpolated values from NASA's MERRA-2 satellite-era reanalysis , and both are corrected for elevation differences according to the International Standard Atmosphere .

The weight assigned to the MERRA-2 value depends on the distance from Antsohihy to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 48%, making the weight assigned to the weather station 52%.

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.