Greater Sydney in winter 2018: Warm and dry

Days were generally warm across Greater Sydney in winter 2018, particularly in July. July and August were dry across Greater Sydney, after average rainfall in June. Night time temperatures were below average away from the coast.

A drier than average winter

  • Most of Greater Sydney received average rainfall in June, through several systems affecting the New South Wales coastal area
  • In contrast, July and August were below average, as Greater Sydney was influenced by the warm and dry conditions affecting the rest of New South Wales
  • As a result of the differing climate influences, only two Greater Sydney sites recorded their lowest winter rainfall in at least 20 years
  • A narrow storm band brought 105.8 mm to Norah Heads AWS in the 24 hours to 9 am 11 June. This was the only site to record above average winter rainfall

Warm days and cool nights

Sydney (Observatory Hill)

  • Total rainfall for Sydney (Observatory Hill) was 194.6 mm, which is 63% of the long-term average of 310.2 mm
  • The mean daily maximum temperature for Sydney (Observatory Hill) was 18.9 °C, which is 1.8 °C above the long-term average of 17.1 °C. The warmest day was 25.6 °C on 11 Aug, and the coolest day was on 27 Aug when the temperature reached 14.5 °C
  • The mean daily minimum temperature for Sydney (Observatory Hill) was 9.2 °C, which is 0.4 °C above the long-term average of 8.8 °C. The coldest morning was 4.6 °C on 16 Jul, and the warmest morning was on 16 Aug when the minimum temperature was 14.6 °C

Further information

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Extremes in winter 2018
Hottest day 26.7 °C at Camden Airport AWS on 11 Aug
Warmest days on average 19.6 °C at Richmond RAAF
Coolest days on average 10.6 °C at Mount Boyce AWS
Coldest day 3.9 °C at Mount Boyce AWS on 17 Jun
Coldest night -4.9 °C at Camden Airport AWS on 16 Jul
Coolest nights on average 2.8 °C at Mount Boyce AWS
Warmest nights on average 10.6 °C at Sydney Harbour (Wedding Cake West)
Warmest night 14.8 °C at Sydney Harbour (Wedding Cake West) on 16 Aug
Warmest on average overall 14.5 °C at Norah Head AWS
Coolest on average overall 6.7 °C at Mount Boyce AWS
Wettest overall 403.2 mm at Norah Head AWS
Driest overall 39.8 mm at Penrith Lakes AWS
Wettest day 105.8 mm at Norah Head AWS on 11 Jun
Strongest wind gust 106 km/h at Wattamolla AWS on 18 Jun

Lowest winter total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
winter
Springwood (Valley Heights) 42.0 9.6 in 1995* 186.3
Darkes Forest (Kintyre) 108.0 85.6 in 1995* 332.5

* note: there are gaps in the historical record at this site, so it is possible a lower value has gone unreported




Record highest winter mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Bankstown Airport AWS 19.3 = 19.3 in 2013 48 18.0



Record lowest winter temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Mangrove Mountain AWS -0.8 on 30 Aug -0.5 on 26 Jun 2016 25 6.6
Canterbury Racecourse AWS -1.6 on 16 Jul = -1.6 on 3 Jul 2002 23 6.5
Penrith Lakes AWS -1.8 on 16 Jul -1.4 on 12 Jul 2002 23 6.2



Record lowest winter mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
winter
Canterbury Racecourse AWS 5.6 = 5.6 in 2004 22 6.5



Summary statistics for winter 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
winter
2018
Diff
from
average
Highest for
winter
2018
Mean for
winter
2018
Diff
from
average
Lowest for
winter
2018
Total for
winter
2018
Average
for
winter
Rank of
winter
2018
Fraction of
winter
average
Badgerys Creek AWS 18.7 +0.6 26.5 11 Aug 4.4 -0.4 -3.6 16 Jul 60.0 119.4 average 50%
Bankstown Airport AWS 19.3 +1.3 26.3 11 Aug 5.4 -0.6 -1.4 16 Jul 85.0 174.0 low 49%
Camden Airport AWS 18.8 +0.8 26.7 11 Aug 3.4 -0.4 -4.9 16 Jul 56.0 146.8 low 38%
Campbelltown (Mount Annan) 18.7 +0.6 26.3 11 Aug 4.1 -0.7 -3.7 16 Jul 69.0 162.8 v low 42%
Canterbury Racecourse AWS 18.7 +0.5 25.5 11 Aug 5.6 -0.9 -1.6 16 Jul 124.0 227.9 low 54%
Cooranbong (Lake Macquarie AWS) 19.3   25.2 6 Jul 4.3   -3.4 16 Jul 138.0 198.1 average 70%
Gosford AWS 18.5   25.0 6 Jul 6.8   0.9 22 Jul 243.2
Holsworthy (Defence) 18.1   26.0 11 Aug 5.5   -0.4 23 Jul 154.6
Holsworthy Aerodrome AWS 18.4   25.8 11 Aug 5.5   -1.8 16 Jul 92.4
Horsley Park Equestrian Centre AWS 18.6 +0.6 25.6 11 Aug 5.8 -0.7 -1.7 16 Jul 54.6 149.1 low 37%
Mangrove Mountain AWS 17.3 +1.0 23.1 11 Aug 5.9 -0.7 -0.8 30 Aug 122.0 208.3 average 59%
Mount Boyce AWS 10.6 +0.3 17.3 10 Aug 2.8 -0.3 -2.6 15 Jul 85.4 174.0 low 49%
Norah Head AWS 18.8 +0.7 24.2 15 Aug 10.1 -0.4 5.1 15 Jul 403.2 305.9 high 132%
Parramatta North (Masons Drive) 19.0 +0.9 25.6 11 Aug 6.5 -0.5 0.0 16 Jul 84.6 193.4 low 44%
Penrith Lakes AWS 19.5 +0.9 26.4 11 Aug 5.4 -0.8 -1.8 16 Jul 39.8 106.1 v low 38%
Richmond RAAF 19.6 +1.2 26.6 11 Aug 3.8 -0.6 -4.3 15 Jul 50.4 116.0 low 43%
Springwood (Valley Heights) 17.2 +0.6 24.2 11 Aug 7.3 +0.2 1.6 15 Jul 42.0 186.3 v low 23%
Sydney (Observatory Hill Comparison) 19.0   25.0 11 Aug 9.1   4.0 16 Jul 193.2
Sydney (Observatory Hill) 18.9 +1.8 25.6 11 Aug 9.2 +0.4 4.6 16 Jul
Sydney Airport AMO 19.1 +1.4 26.6 11 Aug 8.9 +0.8 4.2 16 Jul 183.4 269.6 average 68%
Sydney Harbour (Wedding Cake West) 17.7 +0.1 24.9 15 Aug 10.6 -0.5 6.1 16 Jul
Sydney Olympic Park AWS (Archery Centre) 19.1   25.5 11 Aug 6.2   -0.9 16 Jul 115.2
Terrey Hills AWS 17.2 +0.4 23.9 15 Aug 8.0 -0.3 1.3 16 Jul 98.8 250.6 v low 39%

Notes

The Seasonal climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater Sydney using the most timely and accurate information available on the date of publication; it will generally not be updated. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

This summary includes data from observing sites in or near the Greater Sydney “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.

This statement has been prepared based on information available at 12 pm on Monday 3 September 2018. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

Averages for individual sites are long-term means based on observations from all available years of record, which vary widely from site to site. They are not shown for sites with less than 10 years of record, as they cannot then be calculated reliably.
The median is sometimes more representative than the mean of long-term average rain.

The Rank indicates how rainfall this time compares with the climate record for the site, based on the decile ranking (very low rainfall is in decile 1, low in decile 2 or 3, average in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a percentage of the long-term mean.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Further information

Media
(03) 9669 4057
Enquiries