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Adelaide

                                                                                                   

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 Adelaide region during 2009–10 was 643 mm, which is slightly above the long-term mean annual rainfall of 633 mm. Figure C1 shows that rainfall across most of the region was average during the reporting period. Only over a small area in the southwest of the region near Victor Harbor was rainfall above average.

Figure C1. Map of annual rainfall deciles for the Adelaide region during 2009–10

Figure C1. Map of annual rainfall deciles for the Adelaide region during 2009–10

There was a strong rainfall gradient in annual rainfall across the region during 2009–10 (Figure C2), ranging from more than 850 mm in the area around Mount Lofty to less than 400 mm over the Adelaide Plains in the northwest of the region. This distribution of rainfall across the region during 2009–10 was very similar to the long-term average rainfall pattern (Figure C3).

 Figure C2. Map of annual rainfall for the Adelaide region during 2009–10

Figure C2. Map of annual rainfall for the Adelaide region during 2009–10

Figure C3. Map of mean annual rainfall for the Adelaide region based on data collected between 1961-1990

Figure C3. Map of mean annual rainfall for the Adelaide region based on data collected between 1961–90

Area-averaged monthly rainfall during 2009–10 for the Adelaide region was generally around the median for most months of the year (Figure C4). Only in July was rainfall well above average, which can be attributed to a persistent southwesterly airstream associated with a negative phase of the Southern Annular Mode at this time. 

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

Figure C4. Graph of total monthly rainfall for the Adelaide region during 2009–10 compared with the long-term percentiles for the region

 

Evapotranspiration

The total area-averaged evapotranspiration (ET) over the Adelaide region during 2009–10 was 629 mm, which is above the long-term mean annual ET of 567 mm. Figure C5 shows that ET was above average to very much above average across most of the region during 2009–10. However, on the Adelaide Plains in the northwest of the region, ET was equivalent to average conditions.

Figure C5. Map of annual evapotranspiration deciles for the Adelaide region during 2009–10

Figure C5. Map of annual evapotranspiration deciles for the Adelaide region during 2009–10

Evapotranspiration was highest along the Mount Lofty Ranges in 2009–10, from the northeast of the region to the southern tip of the Fleurieu Peninsula, and lowest on the Adelaide Plains in the northwest of the region (Figure C6). This distribution of ET across the region during 2009–10 was similar to the long-term average ET pattern (Figure C7).

Figure C6. Map of annual evapotranspiration for the Adelaide region during 2009–10

Figure C6. Map of annual evapotranspiration for the Adelaide region during 2009–10

Figure C7. Map of mean annual evapotranspiration for the Adelaide region based on modelled data from 1961-1990

Figure C7. Map of mean annual evapotranspiration for the Adelaide region based on modelled data from 1961–90

 

Temperature

The Adelaide region experienced area-averaged daily temperatures that were in the 'highest on record' category across the region (Figure C8).

Figure C8. Map of daily maximum temperature deciles for the Adelaide region during 2009–10

Figure C8. Map of daily maximumtemperature deciles for the Adelaide region during 2009–10

Average daily maximum temperatures across the Adelaide region during 2009–10 were highest on the Adelaide Plains in the northwest of the region and lowest around Mount Lofty and the southern tip of the Fleurieu Peninsula (Figure C9). This strong temperature gradient across the region during the reporting period is typical for the region (Figure C10).

Figure C9. Map of daily maximum temperature for the Adelaide region during 2009–10

Figure C9. Map of daily maximum temperature for the Adelaide region during 2009–10

Figure C10. Map of mean daily maximum temperature for the Adelaide region based on data collected between 1961-1990

Figure C10. Map of mean daily maximum temperature for the Adelaide region based on data collected between 1961–90

Area-averaged monthly maximum daily temperatures were also generally well above average for most of the year (Figure C11). Daily maximum temperatures during November were the highest on record for the region. Central and southeastern Australia were affected by an exceptionally prolonged heatwave during this month; Adelaide experienced eight consecutive days above 35°C.

Figure C11. Graph of monthly daily maximum temperature for the Adelaide region during 2009–10 compared against the long-term percentiles for the region

Figure C11. Graph of monthly dailymaximum temperature for the Adelaide region during 2009–10 compared with the long-term percentiles for the region