Average Weather in Bwizibwera Uganda

1. World
2. Uganda
3. Western Region
4. Mbarara District
5. Bwizibwera

The climate in Bwizibwera is warm and overcast. Over the course of the year, the temperature typically varies from 59°F to 82°F and is rarely below 56°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 Bwizibwera, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Bwizibwera begins around June 9 and lasts for 3.5 months, ending around September 23. On August 15, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 55% of the time, and overcast or mostly cloudy 45% of the time.

The cloudier part of the year begins around September 23 and lasts for 8.5 months, ending around June 9. On April 11, the cloudiest day of the year, the sky is overcast or mostly cloudy 81% of the time, and clear, mostly clear, or partly cloudy 19% 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 Bwizibwera varies very significantly throughout the year.

The wetter season lasts 8.5 months, from September 6 to May 23, with a greater than 39% chance of a given day being a wet day. The chance of a wet day peaks at 66% on April 26.

The drier season lasts 3.4 months, from May 23 to September 6. The smallest chance of a wet day is 10% on July 4.

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 66% on April 26.

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. Bwizibwera experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Bwizibwera. The most rain falls during the 31 days centered around April 16, with an average total accumulation of 4.1 inches.

The least rain falls around July 1, with an average total accumulation of 0.7 inches.

The length of the day in Bwizibwera does not vary substantially over the course of the year, staying within 9 minutes of 12 hours throughout. In 2017, the shortest day is June 21, with 12 hours, 5 minutes of daylight; the longest day is December 21, with 12 hours, 10 minutes of daylight.

The earliest sunrise is at 6:36 AM on November 5, and the latest sunrise is 31 minutes later at 7:07 AM on February 12. The earliest sunset is at 6:45 PM on November 1, and the latest sunset is 31 minutes later at 7:15 PM on February 9.

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

Bwizibwera experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 7.8 months, from October 9 to June 3, during which time the comfort level is muggy, oppressive, or miserable at least 5% of the time. The muggiest day of the year is April 25, with muggy conditions 18% of the time.

The least muggy day of the year is July 28, when muggy conditions are essentially unheard of.

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 Bwizibwera experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.2 months, from May 4 to September 9, with average wind speeds of more than 3.2 miles per hour. The windiest day of the year is July 5, with an average hourly wind speed of 3.8 miles per hour.

The calmer time of year lasts for 7.8 months, from September 9 to May 4. The calmest day of the year is November 17, with an average hourly wind speed of 2.5 miles per hour.

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

The wind is most often from the north for 2.6 weeks, from January 1 to January 19, with a peak percentage of 35% on January 1. The wind is most often from the east for 3.3 months, from January 19 to April 29 and for 5.0 months, from August 2 to January 1, with a peak percentage of 55% on September 24. The wind is most often from the south for 3.1 months, from April 29 to August 2, with a peak percentage of 53% on July 3.

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 1.7 months, from January 19 to March 11, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is February 10, with an average of 6.1 kWh.

The darker period of the year lasts for 1.1 months, from April 12 to May 16, with an average daily incident shortwave energy per square meter below 5.1 kWh. The darkest day of the year is May 1, with an average of 4.9 kWh.

For the purposes of this report, the geographical coordinates of Bwizibwera are -0.592 deg latitude, 30.629 deg longitude, and 4,629 ft elevation.

The topography within 2 miles of Bwizibwera contains only modest variations in elevation, with a maximum elevation change of 459 feet and an average elevation above sea level of 4,680 feet. Within 10 miles contains only modest variations in elevation (1,644 feet). Within 50 miles contains very significant variations in elevation (4,203 feet).

The area within 2 miles of Bwizibwera is covered by grassland (55%), cropland (27%), and artificial surfaces (10%), within 10 miles by grassland (48%) and cropland (31%), and within 50 miles by cropland (33%) and grassland (30%).

This report illustrates the typical weather in Bwizibwera, 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 Bwizibwera.

For each station, the records are corrected for the elevation difference between that station and Bwizibwera 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 Bwizibwera is computed as the weighted average of the individual contributions from each station, in addition to a contribution from the MERRA-2 reconstruction, corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Bwizibwera.

The station weigths are proportional to the inverse of the distance between Bwizibwera and a given station.

The weight assigned to the MERRA-2 value depends on the distance from Bwizibwera to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 11%.

The stations contributing to this reconstruction are: Bukoba Airport (46%, 156 kilometers, southeast) and Kigali International Airport (44%, 163 kilometers, south).

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.