Average Weather in Zwedru Liberia
In Zwedru, the wet season is warm, oppressive, and mostly cloudy and the dry season is hot, muggy, and partly cloudy. Over the course of the year, the temperature typically varies from 68°F to 88°F and is rarely below 61°F or above 95°F.
Based on the beach/pool score, the best time of year to visit Zwedru for hot-weather activities is from late November to mid February.
The temperature in Zwedru varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.
Average High and Low Temperature
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.
Average Hourly Temperature
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
Sioguí Arriba, Panama (5,110 miles away); Villavicencio, Colombia (4,512 miles); and Ungaran, Indonesia (8,230 miles) are the far-away foreign places with temperatures most similar to Zwedru (view comparison).
In Zwedru, 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 Zwedru begins around October 8 and lasts for 4.3 months, ending around February 18. On December 24, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 63% of the time, and overcast or mostly cloudy 37% of the time.
The cloudier part of the year begins around February 18 and lasts for 7.7 months, ending around October 8. On April 25, the cloudiest day of the year, the sky is overcast or mostly cloudy 77% of the time, and clear, mostly clear, or partly cloudy 23% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Zwedru varies very significantly throughout the year.
The wetter season lasts 7.6 months, from March 25 to November 13, with a greater than 42% chance of a given day being a wet day. The chance of a wet day peaks at 76% on September 30.
The drier season lasts 4.4 months, from November 13 to March 25. The smallest chance of a wet day is 7% on January 19.
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 76% on September 30.
Daily Chance of Precipitation
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. Zwedru experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in Zwedru. The most rain falls during the 31 days centered around September 25, with an average total accumulation of 9.3 inches.
The least rain falls around January 12, with an average total accumulation of 0.5 inches.
Average Monthly Rainfall
The length of the day in Zwedru does not vary substantially over the course of the year, staying within 28 minutes of 12 hours throughout. In 2019, the shortest day is December 22, with 11 hours, 46 minutes of daylight; the longest day is June 21, with 12 hours, 29 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:16 AM on May 24, and the latest sunrise is 34 minutes later at 6:50 AM on February 2. The earliest sunset is at 6:12 PM on November 11, and the latest sunset is 39 minutes later at 6:51 PM on July 17.
Daylight saving time (DST) is not observed in Zwedru during 2019.
Sunrise & Sunset with 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.
Zwedru experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 11 months, from January 29 to December 23, during which time the comfort level is muggy, oppressive, or miserable at least 75% of the time. The muggiest day of the year is May 5, with muggy conditions 100% of the time.
The least muggy day of the year is January 11, with muggy conditions 67% of the time.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Zwedru experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 3.6 months, from June 13 to October 2, with average wind speeds of more than 5.8 miles per hour. The windiest day of the year is August 14, with an average hourly wind speed of 7.5 miles per hour.
The calmer time of year lasts for 8.4 months, from October 2 to June 13. The calmest day of the year is December 4, with an average hourly wind speed of 4.1 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Zwedru varies throughout the year.
The wind is most often from the south for 9.1 months, from March 20 to December 22, with a peak percentage of 82% on June 22. The wind is most often from the west for 2.9 months, from December 22 to March 20, with a peak percentage of 32% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Zwedru throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Zwedru for general outdoor tourist activities is from mid December to late January, with a peak score in the last week of December.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Zwedru for hot-weather activities is from late November to mid February, with a peak score in the last week of December.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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 Zwedru 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
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
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.
Growing Degree Days
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 per square meter does not vary significantly over the course of the year, remaining within 0.3 kilowatt-hours of 5.0 kilowatt-hours throughout.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Zwedru are 6.068 deg latitude, -8.136 deg longitude, and 719 ft elevation.
The topography within 2 miles of Zwedru contains only modest variations in elevation, with a maximum elevation change of 161 feet and an average elevation above sea level of 705 feet. Within 10 miles also contains only modest variations in elevation (433 feet). Within 50 miles contains only modest variations in elevation (2,195 feet).
The area within 2 miles of Zwedru is covered by grassland (31%), trees (24%), shrubs (24%), and cropland (21%), within 10 miles by trees (45%) and grassland (26%), and within 50 miles by trees (55%) and cropland (20%).
This report illustrates the typical weather in Zwedru, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Zwedru is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . 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.
The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Zwedru, according to the International Standard Atmosphere .
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.
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.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
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.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.