Why is pretoria warmer than johannesburg




















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Your privacy guaranteed. We won't share your contact details. In Pretoria, 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 Pretoria begins around March 28 and lasts for 6. The cloudier part of the year begins around October 10 and lasts for 5.

A wet day is one with at least 0. The chance of wet days in Pretoria varies very significantly throughout the year. The wetter season lasts 5.

The month with the most wet days in Pretoria is December , with an average of The drier season lasts 6. The month with the fewest wet days in Pretoria is July , with an average of 0. 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 Pretoria is December , with an average of To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding day period centered around each day of the year.

Pretoria experiences significant seasonal variation in monthly rainfall. The rainy period of the year lasts for 8. The month with the most rain in Pretoria is January , with an average rainfall of 3. The rainless period of the year lasts for 3. The month with the least rain in Pretoria is July , with an average rainfall of 0.

The length of the day in Pretoria varies over the course of the year. In , the shortest day is June 21 , with 10 hours, 32 minutes of daylight; the longest day is December 21 , with 13 hours, 45 minutes of daylight. The earliest sunrise is at AM on November 30 , and the latest sunrise is 1 hour, 47 minutes later at AM on July 2.

The earliest sunset is at PM on June 9 , and the latest sunset is 1 hour, 40 minutes later at PM on January The figure below presents a compact representation of key lunar data for 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. 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 Pretoria experiences mild seasonal variation over the course of the year. The windier part of the year lasts for 4. The windiest month of the year in Pretoria is September , with an average hourly wind speed of 8. The calmer time of year lasts for 8. The calmest month of the year in Pretoria is March , with an average hourly wind speed of 6.

The wind is most often from the east for 3. The wind is most often from the south for 2. The wind is most often from the north for 5.

To characterize how pleasant the weather is in Pretoria throughout the year, we compute two travel scores. Based on this score, the best times of year to visit Pretoria for general outdoor tourist activities are from late February to mid May and from mid August to late October , with a peak score in the second week of September. Based on this score, the best time of year to visit Pretoria for hot-weather activities is from mid December to mid March , with a peak score in the second week of February.

For each hour between AM and PM of each day in the analysis period to , 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. Temperatures in Pretoria 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.

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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 4. The brightest month of the year in Pretoria is December , with an average of 7. The darker period of the year lasts for 2. The darkest month of the year in Pretoria is June , with an average of 4. For the purposes of this report, the geographical coordinates of Pretoria are The topography within 2 miles of Pretoria contains significant variations in elevation, with a maximum elevation change of feet and an average elevation above sea level of 4, feet.

Within 10 miles contains significant variations in elevation 1, feet. Within 50 miles contains very significant variations in elevation 2, feet. This report illustrates the typical weather in Pretoria, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, to December 31, There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Pretoria.

For each station, the records are corrected for the elevation difference between that station and Pretoria 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 Pretoria is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Pretoria and a given station.

To get a sense of how much these sources agree with each other, you can view a comparison of Pretoria and the stations that contribute to our estimates of its temperature history and climate.



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