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January 2018 Climate Summary

The total monthly rainfall for January (slide1) indicated higher rainfall (green shading) to the eastern side of the province while the western side experienced a typical dry period - extreme low rainfall conditions (≤10mm) prevailed over most of the western side (red and orange shading).  When viewing rainfall against the historical long term means (slide 2), then above normal rainfall occurred over the central to eastern side of the province.  Below normal rainfall was noted in the southern parts of the West Coast including the western side of the Cape Winelands district.  The northern side on the West Coast also appeared to have experienced above normal rainfall. 

slide 1

Slide1

slide 2

Slide2

A similar trend to the above description was found from data of specific weather stations (slide 3) containing total monthly rainfall, mean monthly maximum (Tmax) and minimum temperatures (Tmin) for January 2018, including corresponding historical long term means (LTA).  Rainfall for January on average was reasonably normal, i.e. overall mean of these weather stations averaged 17mm (LTA 20mm).  Half of the weather stations each recorded a total monthly rainfall ≤5mm.  The highest monthly rainfall was recorded at George (89mm versus LTA 74mm), 7 weather stations recorded ≤1mm rain (mainly in the Swartland and Cape Winelands), while 18 weather stations ≥ LTA rainfall (South Coast and Karoo regions).

As for temperatures (slide 3): January experienced normal monthly Tmax (Celsius), resulting in an overall average of 31.0 degrees, ranging from 25.5 (Bredasdorp) to 36.2 degrees (Prince Albert).  Monthly Tmax anomaly at Oudtshoorn was 2.5 degrees.

 

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slide 3

Slide 3

slide 4

Slide4

Monthly mean early morning temperatures (Tmin) for January obtained from the weather stations resulted in a normal overall average of 16.0 degrees, with Tmin’s ranging between 13.5 (Barrydale) to 19.7 degrees (Prince Albert).

Overall water level of provincial state dams on 29th January (slide 4) was 24%.  The water content of dams in the southern coastal parts increased due to better rainfall conditions in that area.


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Agri-Oulook January 2018

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