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Melbourne

                                                                                                   

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 Melbourne region during 2009–10 was 874 mm, which is only slightly above the mean annual rainfall of 864 mm. Figure C.1 shows that the region experienced average rainfall across almost the entire region. Only over small areas in the south around Cranbourne and in the northwest of the region was rainfall above average.

Figure C.1 Map of annual rainfall deciles for the Melbourne region during 2009–10

Figure C.1 Map of annual rainfall deciles for the Melbourne region during 2009–10

During 2009–10, annual rainfall across the Melbourne region ranged from more than 1500 mm in the northeast to less than 600 mm in the west of the region around Melton (Figure C.2). This distribution of rainfall across the region during the reporting period is similar to the long-term average rainfall pattern (Figure C.3).

Figure C.3 Map of average annual rainfall for the Melbourne region, based on data collected between 1961–90

Figure C.2. Map of total annual rainfall for the Melbourne region during 2009–10

Figure C.2 Map of total annual rainfall for the Melbourne region during 2009–10

Figure C.3. Map of average annual rainfall for the Melbourne region, based on data collected between 1961–90

The area-averaged monthly rainfall for 2009–10 shows that generally average rainfall occurred throughout most of the year for the Melbourne region (Figure C.4). Rainfall during November and March was above average as a result of a single high magnitude storm event occurring in each of these months.

Figure C.4 Graph of total monthly rainfall for the Melbourne region during 2009–10 compared against the long-term percentiles for the region

Figure C.4. Graph of total monthly rainfall for the Melbourne region during 2009–10 compared against the long-term percentiles for the region

 

Evapotranspiration

The total area-averaged evapotranspiration (ET) over the Melbourne region during 2009–10 was 639 mm, which is slightly below the mean annual ET of 646 mm. Figure C.5 shows that ET was generally average to below average across most of the region during 2009–10. ET was only above average over a small area to the east of the region.

Figure C.5 Map of annual evapotranspiration deciles for the Melbourne region during 2009–10

Figure C.5 Map of annual evapotranspiration deciles for the Melbourne region during 2009–10

 

During 2009–10 there was a strong gradient in annual ET across the region (Figure C.6), ranging from more than 850 mm in the east to less than 450 mm in the west of the region south of Melton. The distribution of ET across the Melbourne region during 2009–10 is consistent with the long-term average ET pattern (Figure C.7).

Figure C.6 Map of total annual evapotranspiration for the Melbourne region during 2009–10

Figure C.6 Map of total annual evapotranspiration for the Melbourne region during 2009–10

Figure C.7 Map of average annual evapotranspiration for the Melbourne region, based on data collected between 1911–2010

Figure C.7 Map of average annual evapotranspiration for the Melbourne region, based on data collected between 1911–2010

 

Temperature

Figure C.8 shows that the entire Melbourne region experienced very much above average maximum daily temperatures during 2009–10.

Figure C.8 Map of annual maximum daily temperature deciles for the Melbourne region during 2009–10 

Figure C.8 Map of annual maximum daily temperature deciles for the Melbourne region during 2009–10

Daily maximum temperatures across the Melbourne region during 2009–10 were highest in the southwest of the region around the city of Melbourne and lowest in the northeast (Figure C.9). This temperature pattern across the region during the reporting period is consistent with long-term average conditions (Figure C.10).

Figure C.9 Map of annual mean maximum daily temperature for the Melbourne region during 2009–10

Figure C.9 Map of annual mean maximum daily temperature for the Melbourne region during 2009–10

Figure C.10 Map of average annual maximum daily temperature for the Melbourne region, based on data collected between 1961–90

Figure C.10 Map of average annual maximum daily temperature for the Melbourne region based on data collected between 1961–90

 

The area-averaged monthly maximum daily temperatures were also generally well above average for most of the year (Figure C.11). Maximum daily temperatures during November were the highest on record for the region as a result of an exceptionally prolonged heatwave that affected central and south-eastern Australia.

Figure C.11 Graph of average monthly maximum daily temperatures for the Melbourne region during 2009–10 compared against the long-term percentiles for the region

Figure C.11 Graph of average monthly maximum daily temperature for the Melbourne region during 2009–10 compared with the long-term percentiles for the region