Climate and Average Weather Year Round in Leer South Sudan

In Leer, the wet season is hot, oppressive, and overcast and the dry season is sweltering and partly cloudy. Over the course of the year, the temperature typically varies from 70°F to 105°F and is rarely below 65°F or above 110°F.

Based on the beach/pool score, the best time of year to visit Leer for hot-weather activities is from late October to mid February.

The hot season lasts for 2.9 months, from January 27 to April 22, with an average daily high temperature above 101°F. The hottest month of the year in Leer is March, with an average high of 105°F and low of 77°F.

The cool season lasts for 3.6 months, from June 22 to October 10, with an average daily high temperature below 89°F. The coldest month of the year in Leer is August, with an average low of 71°F and high of 86°F.

In Leer, 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 Leer begins around September 6 and lasts for 6.2 months, ending around March 12.

The clearest month of the year in Leer is December, during which on average the sky is clear, mostly clear, or partly cloudy 48% of the time.

The cloudier part of the year begins around March 12 and lasts for 5.8 months, ending around September 6.

The cloudiest month of the year in Leer is April, during which on average the sky is overcast or mostly cloudy 73% 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 Leer varies very significantly throughout the year.

The wetter season lasts 5.7 months, from April 30 to October 21, with a greater than 34% chance of a given day being a wet day. The month with the most wet days in Leer is August, with an average of 20.7 days with at least 0.04 inches of precipitation.

The drier season lasts 6.3 months, from October 21 to April 30. The month with the fewest wet days in Leer is January, with an average of 0.1 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Leer is August, with an average of 20.7 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 69% on August 19.

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. Leer experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.4 months, from March 31 to November 12, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Leer is August, with an average rainfall of 5.8 inches.

The rainless period of the year lasts for 4.6 months, from November 12 to March 31. The month with the least rain in Leer is January, with an average rainfall of 0.0 inches.

The length of the day in Leer does not vary substantially over the course of the year, staying within 36 minutes of 12 hours throughout. In 2024, the shortest day is December 21, with 11 hours, 39 minutes of daylight; the longest day is June 20, with 12 hours, 36 minutes of daylight.

The earliest sunrise is at 5:39 AM on May 26, and the latest sunrise is 40 minutes later at 6:19 AM on January 30. The earliest sunset is at 5:36 PM on November 13, and the latest sunset is 46 minutes later at 6:22 PM on July 14.

Daylight saving time (DST) is not observed in Leer during 2024.

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

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.

Leer experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 7.5 months, from April 8 to November 24, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The month with the most muggy days in Leer is August, with 30.6 days that are muggy or worse.

The month with the fewest muggy days in Leer is January, with 0.1 days that are muggy or worse.

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 Leer experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.1 months, from November 25 to April 27, with average wind speeds of more than 7.2 miles per hour. The windiest month of the year in Leer is February, with an average hourly wind speed of 10.2 miles per hour.

The calmer time of year lasts for 6.9 months, from April 27 to November 25. The calmest month of the year in Leer is September, with an average hourly wind speed of 4.0 miles per hour.

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

The wind is most often from the east for 1.1 months, from March 1 to April 5 and for 2.4 months, from October 4 to December 15, with a peak percentage of 59% on November 25. The wind is most often from the south for 3.3 months, from April 5 to July 15 and for 1.7 weeks, from September 22 to October 4, with a peak percentage of 73% on May 29. The wind is most often from the north for 2.5 months, from December 15 to March 1, with a peak percentage of 63% on January 1.

To characterize how pleasant the weather is in Leer 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 Leer for general outdoor tourist activities is from mid November to early February, 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 Leer for hot-weather activities is from late October to mid February, with a peak score in the last week of December.

Methodology

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 Leer 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.

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.

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 2.6 months, from January 25 to April 12, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest month of the year in Leer is March, with an average of 6.4 kWh.

The darker period of the year lasts for 2.2 months, from June 19 to August 25, with an average daily incident shortwave energy per square meter below 5.0 kWh. The darkest month of the year in Leer is July, with an average of 4.8 kWh.

For the purposes of this report, the geographical coordinates of Leer are 8.303 deg latitude, 30.141 deg longitude, and 1,302 ft elevation.

The topography within 2 miles of Leer is essentially flat, with a maximum elevation change of 43 feet and an average elevation above sea level of 1,299 feet. Within 10 miles is also essentially flat (56 feet). Within 50 miles is essentially flat (135 feet).

The area within 2 miles of Leer is covered by cropland (41%), grassland (37%), and shrubs (21%), within 10 miles by shrubs (41%) and grassland (29%), and within 50 miles by shrubs (43%) and grassland (29%).