November 2017 Climate Summary

Rainfall during November (slide1) occurred over most of the province, though more to even higher intensity in the southern coastal areas.  When viewing rainfall against the historical long term means (slide 2), then normal to above normal rainfall occurred over most of the province (green and blue shading).    

Slide 1

Slide1

Slide 2

Slide2

Slide 3 presents data from specific weather stations, containing total monthly rainfall, mean monthly maximum (Tmax) and minimum temperatures (Tmin) for November 2017, including corresponding historical long term means (LTA).  Rainfall for November on average was reasonably normal, i.e. the overall mean of all these weather stations was 36mm (long term mean 32mm), 17mm more than October, and 30mm more than November 2016.  Half of these weather stations each recorded a total monthly rainfall ranging between 3 (Vredendal) to 29mm (eg. Citrusdal).  Conversely, the weather station near Heidelberg recorded the highest monthly rainfall (110mm), which was well above average, followed by Mossel Bay (88mm), George (79mm) and Swellendam (70mm).

 

As for temperatures (slide 3): November experienced normal monthly Tmax’s (Celsius), resulting in an overall average of 26.7 degrees, ranging from 21.1 (George, LTA 21.5) to 31.6 degrees (Citrusdal, LTA 31.8).  Monthly Tmax anomalies ranged between -1 (Ashton) to 1.3 degrees (Oudtshoorn).  

 

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Slide 3

Slide 3

Monthly early morning temperatures (Tmin) for November obtained from the various weather stations presented an overall average of 11.7 degrees (LTA12.1), with Tmin’s at the various weather stations ranging between between 8.9 (Murraysburg) to 15.0 degrees (Klawer), both less than their LTA’s.  As in the case of Tmax, Monthly Tmin anomalies ranged between -1 to 0.8 degrees, clearly indicating no extreme outliers.

Overall water level of the provincial state dams remained poor at 34% (27th November), compared to last year’s 54% (slide 4).  It can clearly be seen that the dams situated in the southern coastal areas benefited from the good rains, while in the western side those dams actually decreased in water content.

Rains in the southern coastal areas during the past few months have resulted in some restoration in growing conditions (slide 5).  The Swartland and Ruêns wheat production areas clearly show crops maturing and becoming ready for harvesting, or even parts where crops have already been harvested.  However large parts still indicate persistent drought conditions. 

Predictions indicate that La Nina will at least be present during the February to April 2018, implying increased probability for above normal rainfall in the summer rainfall areas.  According to the SAWS forecast of 26th November for the period Dec-Jan-Feb, the Western Cape is to experience above normal temperatures.

Slide 4

Slide4

Slide 5

Slide5


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Agri-Oulook April 2017

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