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SA now experiencing half-year summers

12 October 2020 | Story Leonie Bolleurs | Photo Supplied

Although several international studies have used temperature metrics to statistically classify their seasonal divisions, a study in which Adriaan van der Walt was involved, would be the first known publication in a South African context using temperature as classification metric.

Gone are the days when we as South Africans would experience a three-month spring season, easing into summer, and then cooling off for three months before we hit winter.

Adriaan van der Walt, Lecturer in the Department of Geography at the University of the Free State (UFS), focuses his research on biometeorology (a specialist discipline exploring the role and climate change in physical and human environments) as well as climatology and geographic information systems.

He recently published an article: ‘Statistical classification of South African seasonal divisions on the basis of daily temperature data’ in the South African Journal of Science.

In this study, which Van der Walt undertook with Jennifer Fitchett, a colleague from the University of the Witwatersrand, data on daily maximum and minimum temperatures was collected from 35 meteorological stations of the South African Weather Service, covering the period between 1980 and 2015.

They went to great lengths to ensure that they had a complete set of data before presenting it to demonstrate seasonal brackets.

First for South Africa

Their statistical seasonal brackets indicate that South Africans now experience longer summers (from October to March), autumn in April and May, winter from June to August, and spring in September.

Although considerable work has been done using rainfall to determine seasonality in Southern Africa, Van der Walt believes that these methods did not work well as there are too many inconsistencies in this approach, as identified by Roffe et al. (2019, South African Geographical Journal). To make matters more complicated – as a semi-arid region, and with desert conditions along the west coast – some regions do not have enough rainfall to use as a classifier.

Temperature, on the other hand, worked well in this study. “Temperature, by contrast, is a continuous variable, and in Southern Africa has sufficient seasonal variation to allow for successful classification,” says Van der Walt.

He continues: “Although several international studies used temperature metrics to statistically classify their seasonal divisions, this study would be the first known publication in a South African context using temperature as classification metric.”

Van der Walt says what we understand as seasons largely relates to phenology – the appearance of blossoms in spring, the colouration and fall of leaves in autumn, and the migration of birds as a few examples. “These phenological shifts are more sensitive to temperature than other climatic variables.”

Seasonal brackets

According to Van der Walt, they believe that a clearly defined and communicated method should be used in defining seasons, rather than just assigning months to seasons.

“One of the most important arguments of our work is that one needs to critically consider breaks in seasons, rather than arbitrarily placing months into seasons, and so we welcome any alternate approaches,” he says.

A number of sectors apply the temperature-based division to their benefit. “For example, in the tourism sector it is becoming increasingly important to align advertising with the season most climatically suitable for tourism,” says Van der Walt.

Temperature-based division is also used to develop adaptive strategies to monitor seasonal changes in temperature under climate change. However, Van der Walt points out that each sector will have its own way of defining seasons. “Seasonal boundaries should nevertheless be clearly communicated with the logic behind them,” he says.

News Archive

Ms Oprah Winfrey to receive an honorary doctorate in Education from our university

2011-06-10

Ms Oprah Winfrey

Invitation to the public (PDF document)

Invitation to UFS staff and students (PDF document)

Media accreditation (PDF document)

Street closures on 23 and 24 June 2011 (Bloemfontein Campus)

Map from the Bloemfontein Airport to the UFS (PDF document)

Map of the UFS (PDF document)

For more information, please contact:
Tel: 051 401 3000
E-mail: info@ufs.ac.za

Staff and students from our Qwaqwa Campus, please contact:
Dr Elias Malete's office

Our university will be awarding an honorary doctorate in Education to the global media icon, philanthropist and public educator, Ms Oprah Winfrey, on its Bloemfontein Campus on Friday, 24 June 2011.

Both the Council and Senate of our university gave strong support to awarding the honorary doctorate to Ms Winfrey.

By awarding the honorary doctorate, we want to recognise Ms Winfrey’s accomplishments and unparalleled work as a global media leader, as well as a philanthropist with vision and foresight in the field of education and development.

“It is a great privilege for us to be the first South African university to honour Ms Winfrey in this way and to be able to recognise a global icon of her stature,” says Prof. Jonathan Jansen, Vice-Chancellor and Rector of our university.

Ms Winfrey already holds honorary doctorates from Princeton University as well as Duke University in the United States, among others.

Reaching millions of viewers in more than 150 countries with her award-winning programme, “The Oprah Winfrey Show,” she has brought genuine change into the lives of ordinary people during its 25-year run.

Capitalising on the power of the media and her standing as a global icon, Ms Oprah Winfrey has brought a range of critical social and educational matters to the attention of her viewers. In 2000, she expanded her media reach through the successful creation of O, The Oprah Magazine, which then debuted in South Africa in 2002. Earlier this year, she extended her media influence through the launch of a US cable channel, OWN: Oprah Winfrey Network.

Her Book Club has had a dramatic and profound impact on the reading habits of America and those of people in other parts of the world, while her public charity, Oprah’s Angel Network, collected approximately $80 million over a period of twelve years in aid of building schools, women’s shelters and youth centres across the globe.

Through her private charity, The Oprah Winfrey Foundation, hundreds of grants have been awarded in support of empowering women, children and families, and The Oprah Winfrey Scholars Program, supports hundreds of university students, in the United States and elsewhere, who are committed to giving back and making a difference in their communities and country.

During a December 2000 visit to former president Nelson Mandela, Ms Winfrey pledged to build a school for girls in South Africa. This gift was to become the Oprah Winfrey Leadership Academy for Girls, which opened in 2007.

The Academy embodies her strong belief in the power of education to change the future. The Academy provides a unique educational opportunity to over 400 young girls, in Grades 7 through 12, from all over South Africa. These young women come from small rural towns and the big cities, but they share a common background in that they all come from poor families.

Ms Winfrey believes that the Academy can contribute to the development of a new generation of women leaders, deeply imbued with a sense of public service. The Academy stands as a beacon of hope in the educational landscape of this country.

More recently, Ms Winfrey has turned her attention to the failing public-school system in the United States and has brought the impact thereof on the lives of many people in America to the attention of the American public and policy-makers. Even more profoundly, she has highlighted how poor education entrenches poverty and social exclusion. In this sense, Ms Winfrey demonstrates the interconnection between education struggles in the USA and South Africa in powerful ways.

Both the Interim Director of our university’s International Institute for Studies in Race, Reconciliation and Social Justice, Mr John Samuel, and Prof. Jansen have worked for and with Ms Winfrey on matters of education at her school in Johannesburg, and in South Africa more broadly.

The South African public is invited to share in this occasion, and attend the award ceremony. A limited number of tickets will be available to the public from Wednesday, 15 June 2011 to Wednesday, 22 June 2011, and can be purchased from Computicket at an administrative cost of R10 a ticket.

Media Release
11 June 2011
Issued by: Lacea Loader
Director: Strategic Communication
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: news@ufs.ac.za

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