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August 2018 Climate Summary

The Western Cape experienced most of its rain in the West Coast, Cape Winelands and Overberg (slide 1).  The southern coastal parts of the province also recorded reasonable rains while the Karoo regions had to be contented with poor rain.  When adding the perspective of long term average rainfall (slide 2), then the eastern side of the province clearly indicated below normal rains (more severely in the Karoo regions), while the western side showed normal to above normal rainfall for August.  In comparison to last year, August this year experienced better rains in the western parts of the province, last year being mostly below normal.  The southern coastal parts in general did not benefit that much as compared to August last year.

 

Slide 3 (data from ±35 weather stations indicating total monthly rainfall, mean monthly maximum (Tmax) and minimum temperatures (Tmin) and historical long term means) showed that rainfall for August this year on average compared reasonably well with the long term mean.  The highest total monthly rainfall (106mm) occurred near Mossel Bay.  Conversely towns more to the eastern side of the province received less than half of their normal rainfall quota included De Rust, Oudtshoorn, Murraysburg, Rietbron, Prince Albert and Merweville.

slide 1

Slide1

slide 2

Slide2

Maximum (Tmax) and minimum (Tmin) temperatures (Celsius) in August (slide 3) resulted in temperatures averaging about one degrees less than the long term mean.  The monthly mean Tmax ranged between 13.9 (De Keur, near Ceres) to 21.2 (Klawer) degrees.  The monthly mean Tmin for August (4.8) averaged 1.3 degrees below the long term mean, while ranging between -2.8 (Murraysburg) to 7.8 degrees (Klawer).

 

Rainfall during August increased the overall water level of provincial state dams (slide 4) from last month’s 50% to 58% (3rd September).  Water level of dams in the Karoo regions remained poor.

 

The good rains occurring in the western side of the province resulted in good growing conditions in the Swartland and Overberg (slide 5).  The eastern side of the province remain a major concern in terms of poor growing conditions due to lack of sufficient and follow-up rains.

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 Download Slide 3 PDF

slide 3

Slide 3

slide 4

Slide4

slide 5

Slide5


The latest rainfall forecasts (slides 6 & 7) favour above normal rains for the Western Cape during the following months, however these forecasts are not supported by appropriate confidence levels (ROC area maps).  


slide 6

Slide6

Slide 7

Slide7


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Agri-Oulook July 2018

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