Common use of Climate Clause in Contracts

Climate. Xxxxx Power Station is situated in a summer rainfall area with an average annual precipitation of about 750 mm falling almost entirely during the months of October to April. The average rainfall per month generally exceeds 40 mm during this period, although drought periods do occur which can last for 20 days or longer. Drought periods occur most frequently during the months of October/November and March/April. January is statistically the highest rainfall month with an average monthly rainfall of about 130 mm. June has the lowest rainfall with an average monthly rainfall of about 7 mm. Approximately 85% of the annual rainfall occurs in the summer months and heavy falls of 125 to 150 mm occasionally occur in a single day. The annual average number of thunderstorms is about 75. These storms are often violent with severe lightning and strong (but short-lived) gusty winds and are sometimes accompanied by hail. This region has among the highest hail frequencies in South Africa; about 4 to 7 occurrences (depending mainly on altitude) may be expected annually. January is normally the hottest month with an average daily maximum temperature of 27°C with a mean daily temperature in winter being about 16°C. Winter average daily temperatures vary from 18, 5°C maximum to -1°C minimum. The extreme temperatures recorded range from 34, 7°C to minus 12, 4°C for the period 1920 - 1984. (Source: Weather Bureau, Pretoria) Winds are generally light to moderate except during thunderstorms. Generally the prevailing wind directions are from the North West during the day and from the east at night. During daytime, the prevailing winds are from the north-western direction. During night-time, the prevailing winds are from the north-eastern direction. The highest recorded average wind speed is 17, 6 km/hour. The average wind velocity over the year is 14, 5 km/hour.

Climate. Xxxxx Power Station is situated in a summer rainfall area with an average annual precipitation of about 750 mm falling almost entirely during the months of October to April. The average rainfall per month generally exceeds 40 mm during this period, although drought periods do occur which can last for 20 days or longer. Drought periods occur most frequently during the months of October/November and March/April. January is statistically the highest rainfall month with an average monthly rainfall of about 130 mm. June has the lowest rainfall with an average monthly rainfall of about 7 mm. Approximately 85% of the annual rainfall occurs in the summer months and heavy falls of 125 to 150 mm occasionally occur in a single day. The annual average number of thunderstorms is about 75. These storms are often violent with severe lightning and strong (but short-lived) gusty winds and are sometimes accompanied by hail. This region has among the highest hail frequencies in South Africa; about 4 to 7 occurrences (depending mainly on altitude) may be expected annually. January is normally the hottest month with an average daily maximum temperature of 27°C with a mean daily temperature in winter being about 16°C. Winter average daily temperatures vary from 18, 5°C maximum to -1°C minimum. The extreme temperatures recorded range from 34, 7°C to minus 12, 4°C for the period 1920 - 1984. (Source: Weather Bureau, Pretoria) Winds are generally light to moderate except during thunderstorms. Generally the prevailing wind directions are from the North West during the day and from the east at night. During daytime, the prevailing winds are from the north-western direction. During night-time, the prevailing winds are from the north-eastern direction. The highest recorded average wind speed is 17, 6 km/hour. The average wind velocity over the year is 14, 5 km/hour. (Source: Xxxxxx & Xxxxxx, 1996, Reference 4, page 2.5.) The assumed 1 in 10 year rainfall figures are: Month Cumulative rain (mm) No of days with rainfall > 10mm January 200 6 February 150 6 March 120 5 April 110 4 May 40 3 June 20 2 July 30 2 August 30 2 September 60 3 October 140 6 November 160 7 December 170 6 1 This total is required by the Employer for budgeting purposes only. Actual amounts due will be assessed in terms of the conditions of contract.

Climate. Xxxxx Power Station is situated in a summer rainfall area with an average annual precipitation of about 750 750-mm falling almost entirely during the months of October to April. The average rainfall per month generally exceeds 40 mm during this period, although drought periods do occur which can last for 20 days or longer. Drought periods occur most frequently during the months of October/November and March/April. January is statistically the highest rainfall month with an average monthly rainfall of about 130 130-mm. June has the lowest rainfall with an average monthly rainfall of about 7 mm. Approximately 85% of the annual rainfall occurs in the summer months and heavy falls of 125 to 150 mm occasionally occur in a single day. The annual average number of thunderstorms is about 75. These storms are often violent with severe lightning and strong (but short-lived) gusty winds and are sometimes accompanied by hail. This region has among the highest hail frequencies in South Africa; about 4 to 7 occurrences (depending mainly on altitude) may be expected annually. January is normally the hottest month with an average daily maximum temperature of 27°C with a mean daily temperature in winter being about 16°C. Winter average daily temperatures vary from 18, 518,5°C maximum to -1°C minimum. The extreme temperatures recorded range from 34, 734,7°C to minus 12, 412,4°C for the period 1920 - 1984. (Source: Weather Bureau, Pretoria) Winds are generally light to moderate except during thunderstorms. Generally the prevailing wind directions are from the North West during the day and from the east at night. During daytime, the prevailing winds are from the north-western direction. During night-time, the prevailing winds are from the north-eastern direction. The highest recorded average wind speed is 17, 6 km/hour. The average wind velocity over the year is 14, 5 km/hour. (Source: MSN weather & Weather 24, average records 2008 - 2009.)  The assumed 1 in 10 year rainfall figures are: January 200 6 February 150 6 March 120 5 April 110 4 May 40 3 June 20 2 July 30 2 August 30 2 September 60 3 October 140 6 November 160 7 December 170 6 Records for Bethal (2008 - 2009) The average relative humidity on an annual base are as follows: 08:00 = 80% 14:00 = 52% 20:00 = 73% Records for Bethal (2008 - 2009) Winds are mostly north-westerly except for February and March when they are easterly to south- easterly. The highest wind speeds are recorded from the south-east: on average 14km/h. Records for Bethal (2008 - 2009) Thunder occurs mostly from November to January with average of 35.7 days annually.

Climate. Xxxxx Power Station is situated in a summer rainfall area with an average annual precipitation of about 750 750-mm falling almost entirely during the months of October to April. The average rainfall per month generally exceeds 40 mm during this period, although drought periods do occur which can last for 20 days or longer. Drought periods occur most frequently during the months of October/November and March/April. January is statistically the highest rainfall month with an average monthly rainfall of about 130 130-mm. June has the lowest rainfall with an average monthly rainfall of about 7 mm. Approximately 85% of the annual rainfall occurs in the summer months and heavy falls of 125 to 150 mm occasionally occur in a single day. The annual average number of thunderstorms is about 75. These storms are often violent with severe lightning and strong (but short-lived) gusty winds and are sometimes accompanied by hail. This region has among the highest hail frequencies in South Africa; about 4 to 7 occurrences (depending mainly on altitude) may be expected annually. January is normally the hottest month with an average daily maximum temperature of 27°C with a mean daily temperature in winter being about 16°C. Winter average daily temperatures vary from 18, 518,5°C maximum to -1°C minimum. The extreme temperatures recorded range from 34, 734,7°C to minus 12, 4Minus 12,4°C for the period 1920 - 1984. (Source: Weather Bureau, Pretoria) Winds are generally light to moderate except during thunderstorms. Generally the prevailing wind directions are from the North West during the day and from the east at night. During daytime, the prevailing winds are from the north-western direction. During night-time, the prevailing winds are from the north-eastern direction. The highest recorded average wind speed is 17, 6 17,6 km/hour. The average wind velocity over the year is 14, 5 14,5 km/hour. (Source: Xxxxxx & Xxxxxx, 1996, Reference 4, page 2.5.) The assumed 1 in 10 year rainfall figures are: Month Cumulative rain (mm) No of days with rainfall > 10mm January 200 6 February 150 6 March 120 5 April 110 4 May 40 3 June 20 2 July 30 2 August 30 2 September 60 3 October 140 6 November 160 7 December 170 6 Records for Bethal (2008 - 2009) The average relative humidity on an annual base as follows: Records for Bethal (2008 - 2009) Winds are mostly north-westerly except for February and March when they are easterly to south-easterly. The highest wind speeds are recorded from the south-east: on average 14km/h.

Climate. Xxxxx Power Station is situated in a summer rainfall area with an average annual precipitation of about 750 750- mm falling almost entirely during the months of October to April. The average rainfall per month generally exceeds 40 mm during this period, although drought periods do occur which can last for 20 days or longer. Drought periods occur most frequently during the months of October/November and March/April. January is statistically the highest rainfall month with an average monthly rainfall of about 130 130-mm. June has the lowest rainfall with an average monthly rainfall of about 7 mm. Approximately 85% of the annual rainfall occurs in the summer months and heavy falls of 125 to 150 mm occasionally occur in a single day. The annual average number of thunderstorms is about 75. These storms are often violent with severe lightning and strong (but short-lived) gusty winds and are sometimes accompanied by hail. This region has among the highest hail frequencies in South Africa; about 4 to 7 occurrences (depending mainly on altitude) may be expected annually. January is normally the hottest month with an average daily maximum temperature of 27°C with a mean daily temperature in winter being about 16°C. Winter average daily temperatures vary from 18, 518,5°C maximum to -1°C minimum. The extreme temperatures recorded range from 34, 734,7°C to minus 12, 412,4°C for the period 1920 - 1984. (Source: Weather Bureau, Pretoria) Winds are generally light to moderate except during thunderstorms. Generally the prevailing wind directions are from the North West during the day and from the east at night. During daytime, the prevailing winds are from the north-western direction. During night-time, the prevailing winds are from the north-eastern direction. The highest recorded average wind speed is 17, 6 km/hour. The average wind velocity over the year is 14, 5 km/hour. (Source: MSN weather & Weather 24, average records 2008 - 2009.)  The assumed 1 in 10 year rainfall figures are: January 200 6 February 150 6 March 120 5 April 110 4 May 40 3 June 20 2 July 30 2 August 30 2 September 60 3 October 140 6 November 160 7 December 170 6 Records for Bethal (2008 - 2009) The average relative humidity on an annual base are as follows:

Climate. Xxxxx Power Station is situated in a summer rainfall area with an average annual precipitation of about 750 750-mm falling almost entirely during the months of October to April. The average rainfall per month generally exceeds 40 mm during this period, although drought periods do occur which can last for 20 days or longer. Drought periods occur most frequently during the months of October/November and March/April. January is statistically the highest rainfall month with an average monthly rainfall of about 130 130-mm. June has the lowest rainfall with an average monthly rainfall of about 7 mm. Approximately 85% of the annual rainfall occurs in the summer months and heavy falls of 125 to 150 mm occasionally occur in a single day. The annual average number of thunderstorms is about 75. These storms are often violent with severe lightning and strong (but short-lived) gusty winds and are sometimes accompanied by hail. This region has among the highest hail frequencies in South Africa; about 4 to 7 occurrences (depending mainly on altitude) may be expected annually. January is normally the hottest month with an average daily maximum temperature of 27°C with a mean daily temperature in winter being about 16°C. Winter average daily temperatures vary from 18, 518,5°C maximum to -1°C minimum. The extreme temperatures recorded range from 34, 734,7°C to minus 12, 412,4°C for the period 1920 - 1984. (Source: Weather Bureau, Pretoria) Winds are generally light to moderate except during thunderstorms. Generally the prevailing wind directions are from the North West during the day and from the east at night. During daytime, the prevailing winds are from the north-western direction. During night-time, the prevailing winds are from the north-eastern direction. The highest recorded average wind speed is 17, 6 km/hour. The average wind velocity over the year is 14, 5 km/hour. (Source: MSN weather & Weather 24, average records 2008 - 2009.)