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Updated : 21/9/2014

Climate - Benoni

Source : SaExplorer
Benoni normally receives about 579mm of rain per year, with most rainfall occurring during summer. The chart below (lower left) shows the average rainfall values for Benoni per month. It receives the lowest rainfall (0mm) in July and the highest (110mm) in January. The monthly distribution of average daily maximum temperatures (centre chart below) shows that the average midday temperatures for Benoni range from 16.4C in June to 26C in January. The region is the coldest during July when the mercury drops to 0.4C on average during the night. Consult the chart below (lower right) for an indication of the monthly variation of average minimum daily temperatures.
Move mouse over chart bars for monthly values
Average rainfall (mm)
110  
 
0  
J F M A M J J A S O N D
Average midday temperature (C)
026  
 
16  
J F M A M J J A S O N D
Average night-time temperature (C)
014  
 
0  
J F M A M J J A S O N D

Hardiness Rating


 

Temperature scale of hardiness zones, showing the average annual minimum temperature in degrees Celsius. The main factors determining average minimum temperature are elevation, latitude and proximity to the coast.

A hardiness zone (a subcategory of Vertical Zonation) is a geographically defined area in which a specific category of plant life is capable of growing, as defined by climatic conditions, including its ability to withstand the minimum temperatures of the zone (see the scale on the left). For example, a plant that is described as "hardy to zone 10" means that the plant can withstand a minimum temperature of -1C. A more resilient plant that is "hardy to zone 9" can tolerate a minimum temperature of -7C.

Based on the scale and the average temperatures shown above Benoni has a hardiness rating of H10 and is therefore suitable for the growing of plant of hardiness rating H1 to H10.

 

 

Distribution of Average First Date of Heavy Frost

Source : http://planet.botany.uwc.ac.za/nisl/Invasives/Assignments/GARP/atlas/atlas_toc.htm

On average first frost occurs in May over most of the interior of South Africa. However, the high lying Drakensberg and Maluti mountains already experience their first heavy frosts as early as February/March. Relevant statistics on first heavy frost occurrences appear in the table below. If the Free State is taken by way of example, results imply that on average by 11 May, 20% of the Free State has experienced a severe frost, by 16 May 50% has had its first severe frost and by 22 May, 80% of the Free State has had its first severe frost. Computations by this equation were terminated on July 3 (hence the "Early July" designation) after which a "Last Severe Frost Date" equation came in operation.

 

First Date of Heavy Frost
Province/Country Date by which at least x % of province or country will experience First Heavy Frost on Average

20 %

50 % 80%
Northern Province 8 June 19 June Early July
Mpumalanga 17 May 29 May 1 July
North-West 22 May 26 May 2 June
Northern Cape 16 May 26 May 3 June
Gauteng 19 May 24 May 1 June
Free State 11 May 16 May 22 May
KwaZulu-Natal Frost Free 2 June Early July
Eastern Cape 8 May 26 May 30 June
Western Cape 21 May 9 June Early July
Swaziland 20 June Early July Early July
Lesotho 12 March 24 April 8 May

Distribution of Average Last Date of Heavy Frost

Source : http://planet.botany.uwc.ac.za/nisl/Invasives/Assignments/GARP/atlas/atlas_toc.htm

Patterns of average last date of heavy frost are, effectively, a reversal of those of the first heavy frost date. Most of the interior experiences last frosts towards the end of August and early September, but in the high Drakensberg frosts are predicted to persist into early December. The statistics show that Swaziland is effectively frost free by mid-July, the Northern Province by the end of July, while 80% of the Free State and Eastern Cape have heavy frosts persisting into the second half of September.

Last Date of Heavy Frost
Province/Country Date by which at least x % of province or country will experience Last Heavy Frost on Average

20 %

50 % 80%
Northern Province Early July 13 July 1 August
Mpumalanga Early July 13 August 2 September
North-West 17 August 29 August 2 September
Northern Cape 15 August 31 August 14 September
Gauteng 15 August 27 August 3 September
Free State 5 September 11 September 19 September
KwaZulu-Natal Frost Free 21 July 22 September
Eastern Cape 14 July 31 August 24 August
Western Cape 11 July 17 August 10 September
Swaziland Early July Early July 14 July
Lesotho 24 September 14 October *1 December

*Unreliable : Extrapolated beyond last observed date of 22 November

Using the Gauteng extremes of the above tables for first and last frost dates then Benoni will have between 261 and 291 frost free growing days with a mean of 272 days.

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