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Sydney

                                                                                                   

Climate Overview

                             

Maps and graphs provide a summary of the rainfall, evaporation and temperature data for the reporting period.

 

Rainfall

The total area-averaged rainfall over the Sydney region during 2009–10 was 789 mm, which is below the mean annual rainfall of 890 mm. This can be partially attributed to the influence of the 2009–10 El Niño event. Rainfall was average to below average level for most of the region (Figure C1). Only the southernmost tip of the region recorded above average rainfall.

 Figure C1. Map of annual rainfall deciles for the Sydney region during 2009-10

Figure C1. Annual rainfall deciles for the Sydney region during 2009–10

During 2009–10, rainfall across the Sydney region was highest along the coastline, particularly south of Wollongong. Rainfall was lowest in the southwestern part of the region around Goulburn (Figure C2). This distribution of rainfall across the region during the reporting period is similar to the long-term average rainfall pattern (Figure C3).

Figure C2. Map of total annual rainfall for the Sydney region during 2009-10

Figure C2. Total annual rainfall for the Sydney region during 2009–10

Figure C3. Map of average annual rainfall for the Sydney region, based on data collected between 1961-1990 

Figure C3. Average annual rainfall for the Sydney region, based on data collected 1961–90

The area-averaged monthly rainfall for 2009–10 shows that average to below average rainfall occurred throughout most of the year for the Sydney region (Figure C4). Moist onshore flow and troughs brought substantial rainfall to the region during February, which resulted in well above average rainfall during this month.

Figure C4. Graph of total monthly rainfall for the Sydney region during 2009-10 compared against the long-term percentiles for the region 

Figure C4. Total monthly rainfall for the Sydney region during 2009–10 compared against the long-term percentiles for the region 

Evaporation

The total area-averaged evapotranspiration (ET) over the Sydney region during 2009–10 was 783 mm, which is above the mean annual ET of 715 mm. Figure C5 shows that ET was above average to very much above average across most of the northern part of the Sydney region during the reporting period. Throughout the southern part of the region, ET was generally equivalent to average conditions.

Figure C5. Map of annual evapotranspiration deciles for the Sydney region during 2009-10 

Figure C5. Annual evapotranspiration deciles for the Sydney region during 2009–10 

During 2009–10, ET was highest in the southeastern part of the region along the coast south of Wollongong and lowest in the southwestern part of the region around Goulburn (Figure C6). The distribution of ET across the Sydney region during 2009–10 is similar to the long-term average ET pattern (Figure C7). 

Figure C6. Map of total annual evapotranspiration for the Sydney region during 2009-10 

Figure C6. Total annual evapotranspiration for the Sydney region during 2009–10 

Figure C7. Map of average annual evapotranspiration for the Sydney region, based on modelled data from 1911-2010 

Figure C7. Average annual evapotranspiration for the Sydney region, based on data collected 1911–2010

Temperature

Figure C8 shows that the entire Sydney region experienced above average maximum daily temperatures during 2009–10. This can be attributed to the influence of the El Niño event yielding hotter conditions across the region. The eastern half of the region experienced the highest maximum daily temperatures on record.

Figure C8. Map of annual maximum daily temperature deciles for the Sydney region during 2009-10 

Figure C8. Annual maximum daily temperature deciles for the Sydney region during 2009–10  

During 2009–10, maximum daily temperatures across the Sydney region were highest in the northeastern part of the region around Camden and Richmond. Temperatures were lowest inland along the western boundary of the region (Figure C9). This temperature pattern across the region during the reporting period is similar to the long-term average conditions (Figure C10). 

Figure C9. Map of annual mean maximum daily temperature for the Sydney region during 2009-10

Figure C9. Annual mean maximum daily temperature for the Sydney region during 2009–10

Figure C10. Map of average annual maximum daily temperature for the Sydney region based on data collected between 1961-1990 

Figure C10. Average annual maximum daily temperature for the Sydney region, based on data collected 1961–90

The area-averaged monthly maximum daily temperatures were generally above average throughout most of the year (Figure C11) and were well above average during November. Several stations within the region recorded their highest November temperatures in history.

Figure C11. Graph of average monthly maximum daily temperature for the Sydney region during 2009-10 compared with the long-term percentiles for the region 

Figure C11. Average monthly maximum daily temperatures for the Sydney region during 2009–10 compared against the long-term percentiles for the region