Greater Sydney in spring 2018: a wet season

Rainfall totals for Greater Sydney were above average for spring, and record high in some locations. Maximum temperatures were mostly below average, whilst minimum temperatures were mostly above average.

A wet spring for Sydney

Cool days but mild nights

  • Maximum temperatures were below average for most sites in Greater Sydney, typically by around half a degree; for many sites it was the coolest spring since 2010
  • Minimum temperatures were above average for almost all sites in Greater Sydney, by about half to one degree

Sydney (Observatory Hill)

  • Total rainfall for Sydney (Observatory Hill) was 394.8 mm, which is 172% of the long-term average of 229.6 mm and the wettest spring since 1995
  • The mean daily maximum temperature for Sydney (Observatory Hill) was 22.4 °C, which is 0.4 °C above the long-term average of 22.0 °C but the coolest for spring since 2010
  • The warmest day at Observatory Hill was 37.1 °C on 2 November, and the coolest day was on 8 September when the temperature reached 15.4 °C
  • The mean daily minimum temperature for Sydney (Observatory Hill) was 14.4 °C, which is 0.9 °C above the long-term average of 13.5 °C
  • The coldest morning was 7.8 °C on 17 September, and the warmest morning was on 7 November when the minimum temperature was 22.5 °C

Further information

Media
(03) 9669 4057
Enquiries

Extremes in spring 2018
Hottest day 38.9 °C at Sydney Airport AMO on 2 Nov
Warmest days on average 25.2 °C at Penrith Lakes AWS
Coolest days on average 17.9 °C at Mount Boyce AWS
Coldest day 7.2 °C at Katoomba (Murri St) on 3 Sep
Coldest night -1.1 °C at Mount Boyce AWS on 16 Sep
Coolest nights on average 7.8 °C at Mount Boyce AWS
Warmest nights on average 15.1 °C at Sydney Harbour (Wedding Cake West)
Warmest night 24.8 °C at Cooranbong (Lake Macquarie AWS) on 3 Nov
Warmest on average overall 18.8 °C at Penrith Lakes AWS
Coolest on average overall 12.8 °C at Mount Boyce AWS
Wettest overall 522.8 mm at Katoomba (Murri St)
Driest overall 180.0 mm at Campbelltown (Kentlyn)
Wettest day 130.0 mm at Faulconbridge (Great Western Hwy) on 29 Nov
Strongest wind gust 98 km/h at Wattamolla AWS on 7 Oct and 10 Oct

Record highest spring daily rainfall
New record
(mm)
Old
record
Years of
record
Box Hill (McCall Gardens) 74.0 on 28 Nov 65.0 on 7 Sep 2006 26
Mount Boyce AWS 105.0 on 29 Nov 69.0 on 25 Sep 1995 25
Penrith Lakes AWS 89.0 on 29 Nov 62.0 on 15 Nov 2000 24



Record highest spring total rainfall
New record
(mm)
Old
record
Years of
record
Average for
spring
Bankstown Airport AWS 352.2 333.6 in 1969 51 181.2
Macquarie Park (Willandra Village) 451.7 436.2 in 2004 36 231.4
Castle Hill (Kathleen Ave) 385.0 376.0 in 2004 28 206.9
Mount Boyce AWS 439.0 386.4 in 1999 25 225.7
Box Hill (McCall Gardens) 298.0 265.4 in 1999 23 142.6

Highest spring total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
spring
Seven Hills (Collins St) 328.7 495.5 in 1970* 198.5
Katoomba (Murri St) 522.8 593.6 in 1985 272.8
Cooranbong (Avondale) 361.0 635.6 in 1985* 204.9
Mona Vale Golf Club 418.2 477.3 in 1987* 221.6
Avalon Beach (Avalon (Palmgrove Rd)) 392.2 444.0 in 1969* 244.3
Marrickville Golf Club 371.0 507.2 in 1961* 188.7
Prospect Reservoir 301.0 321.3 in 1995* 178.6
Sydney (Observatory Hill) 394.8 453.4 in 1995* 229.6
Pennant Hills (Yarrara Road) 467.3 644.3 in 1961* 207.3

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




Summary statistics for spring 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
spring
2018
Diff
from
average
Highest for
spring
2018
Mean for
spring
2018
Diff
from
average
Lowest for
spring
2018
Total for
spring
2018
Average
for
spring
Rank of
spring
2018
Fraction of
spring
average
Badgerys Creek AWS 23.8 -0.9 33.9 3 Nov 11.1 +0.6 1.8 21 Sep 233.4 157.1 high 149%
Bankstown Airport AWS 23.9 +0.2 37.4 2 Nov 12.1 +0.4 4.6 21 Sep 352.2 181.2 highest 194%
Camden Airport AWS 24.3 +0.1 37.6 2 Nov 10.5 +0.6 1.3 17 Sep 235.8 175.6 high 134%
Campbelltown (Mount Annan) 24.1 -0.7 37.2 2 Nov 10.6 +0.2 2.1 21 Sep 201.0 141.3 high 142%
Canterbury Racecourse AWS 22.5 -1.0 36.9 2 Nov 12.1 0.0 4.5 21 Sep
Cooranbong (Lake Macquarie AWS) 23.3 -1.2 36.2 3 Nov 11.6 +0.6 2.5 21 Sep 347.2 251.1 high 138%
Gosford AWS 22.4   36.3 2 Nov 12.8   4.7 21 Sep 393.2
Holsworthy (Defence) 23.1   38.8 2 Nov 11.2   2.9 17 Sep 324.6
Holsworthy Aerodrome AWS 23.1   37.9 2 Nov 11.8   3.1 21 Sep 220.0
Horsley Park Equestrian Centre AWS 23.8 -0.7 36.9 2 Nov 11.9 +0.1 4.0 21 Sep 280.6 162.6 high 173%
Mangrove Mountain AWS 22.2 -0.4 34.8 2 Nov 11.1 -0.4 2.4 17 Sep 369.8 239.8 high 154%
Mount Boyce AWS 17.9 +0.3 28.9 2 Nov 7.8 +0.2 -1.1 16 Sep 439.0 225.7 highest 195%
Norah Head AWS 22.2 -0.3 35.4 3 Nov 14.8 0.0 9.3 17 Sep 425.2 218.1 v high 195%
Parramatta North (Masons Drive) 23.5 -0.3 37.0 2 Nov 11.8 0.0 4.0 17 Sep 309.0 204.4 v high 151%
Penrith Lakes AWS 25.2 -0.3 38.0 2 Nov 12.4 +0.2 4.0 17 Sep 339.4 169.3 v high 200%
Richmond RAAF 25.0 -0.1 37.4 2 Nov 11.4 +0.3 1.2 21 Sep 226.6 171.0 high 133%
Springwood (Valley Heights) 22.4 -1.2 36.0 2 Nov 11.5 -0.2 5.4 21 Sep 331.0 224.9 high 147%
Sydney (Observatory Hill) 22.4 +0.4 37.1 2 Nov 14.4 +0.9 7.8 17 Sep 394.8 229.6 v high 172%
Sydney Airport AMO 22.9 +0.4 38.9 2 Nov 14.3 +1.2 7.4 17 Sep 301.8 211.2 high 143%
Sydney Harbour (Wedding Cake West) 20.2 -0.9 35.6 2 Nov 15.1 -0.2 9.5 17 Sep
Sydney Olympic Park AWS (Archery Centre) 23.3   37.0 2 Nov 12.5   4.2 17 Sep 392.0
Terrey Hills AWS 21.3 -1.2 35.2 2 Nov 12.8 -0.4 5.5 17 Sep 417.0 238.7 v high 175%

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 9 am on Monday 3 December 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