Average Weather in December in Tshaneni Swaziland
Daily high temperatures increase by 3°F, from 82°F to 84°F, rarely falling below 73°F or exceeding 92°F.
Daily low temperatures increase by 3°F, from 66°F to 68°F, rarely falling below 61°F or exceeding 73°F.
For reference, on January 19, the hottest day of the year, temperatures in Tshaneni typically range from 69°F to 85°F, while on July 6, the coldest day of the year, they range from 55°F to 74°F.
Average High and Low Temperature in December
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in December
The month of December in Tshaneni experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 43% to 35%. The highest chance of overcast or mostly cloudy conditions is 43% on December 2.
The clearest day of the month is December 31, with clear, mostly clear, or partly cloudy conditions 65% of the time.
For reference, on December 2, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 43%, while on July 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 93%.
Cloud Cover Categories in December
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. In Tshaneni, the chance of a wet day over the course of December is gradually decreasing, starting the month at 48% and ending it at 46%.
For reference, the year's highest daily chance of a wet day is 50% on December 18, and its lowest chance is 2% on July 8.
Probability of Precipitation in December
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during December in Tshaneni is essentially constant, remaining about 4.2 inches throughout, and rarely exceeding 6.7 inches or falling below 1.9 inches.
Average Monthly Rainfall in December
Over the course of December in Tshaneni, the length of the day is essentially constant. The shortest day of the month is December 1, with 13 hours, 39 minutes of daylight and the longest day is December 21, with 13 hours, 46 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Tshaneni is 4:53 AM on December 1 and the latest sunrise is 11 minutes later at 5:03 AM on December 31.
The earliest sunset is 6:31 PM on December 1 and the latest sunset is 17 minutes later at 6:48 PM on December 31.
Daylight saving time is not observed in Tshaneni during 2021.
For reference, on December 21, the longest day of the year, the Sun rises at 4:58 AM and sets 13 hours, 46 minutes later, at 6:44 PM, while on June 21, the shortest day of the year, it rises at 6:39 AM and sets 10 hours, 31 minutes later, at 5:10 PM.
Sunrise & Sunset with Twilight in December
The figure below presents a compact representation of key lunar data for December 2021. 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in December
The chance that a given day will be muggy in Tshaneni is rapidly increasing during December, rising from 41% to 59% over the course of the month.
For reference, on February 11, the muggiest day of the year, there are muggy conditions 68% of the time, while on July 19, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in December
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Tshaneni is essentially constant during December, remaining within 0.2 miles per hour of 8.1 miles per hour throughout.
For reference, on September 25, the windiest day of the year, the daily average wind speed is 9.7 miles per hour, while on April 27, the calmest day of the year, the daily average wind speed is 6.7 miles per hour.
Average Wind Speed in December
The hourly average wind direction in Tshaneni throughout December is predominantly from the east, with a peak proportion of 39% on December 22.
Wind Direction in December
Temperatures in Tshaneni 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 in December
The average accumulated growing degree days in Tshaneni are rapidly increasing during December, increasing by 722°F, from 2,808°F to 3,530°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Tshaneni is essentially constant during December, remaining within 0.2 kWh of 7.2 kWh throughout.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Tshaneni are -25.983 deg latitude, 31.717 deg longitude, and 958 ft elevation.
The topography within 2 miles of Tshaneni contains only modest variations in elevation, with a maximum elevation change of 223 feet and an average elevation above sea level of 988 feet. Within 10 miles contains only modest variations in elevation (1,900 feet). Within 50 miles contains very significant variations in elevation (6,276 feet).
The area within 2 miles of Tshaneni is covered by trees (48%), water (35%), and cropland (17%), within 10 miles by bare soil (47%) and cropland (22%), and within 50 miles by cropland (26%) and shrubs (23%).
This report illustrates the typical weather in Tshaneni, 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, Kruger Mpumalanga International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Tshaneni.
At a distance of 91 kilometers from Tshaneni, 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 Tshaneni 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.
Time zones for airports and weather stations are provided by AskGeo.com .