Monday, 2 March 2015 - Seasonal Climate Summary for Sydney - Product code IDCKGC25L0
Sydney in summer 2014-15: Warm nights and thunderstorms
Rainfall was generally average to above average across the Sydney region during summer, with most of the rain falling during periods of thunderstorm activity. There were 17 days with thunder heard at Sydney Airport, well above average for summer and the most since summer 1985-6, including a record 7 consecutive days between 2 and 8 December. These contributed to locally heavy rain, with daily totals exceeding 50 mm on multiple occasions across the city. The heaviest rain fell between 27 and 29 January, with totals to 9 am on the 28th including 57 mm at Observatory Hill and 105.2 mm at Duffys Forest.
Minimum temperatures were well above average across the Sydney region, associated with above average rainfall and sea surface temperatures. At Observatory Hill the mean minimum temperature was 1.6 °C above average and the sixth-warmest on record. There were 52 nights that remained above 20 °C, more than double the historical average of 21 nights. This is the equal-second-greatest number of warm nights on record, behind 64 nights in summer 1990-91. This included 17 consecutive warm nights between 9 and 25 February, the second-longest warm spell on record for Sydney behind 18 days in summer 2009-10.
In comparison, maximum temperatures were generally close to average in western Sydney, with very cool days at the end of January, but 1.2 °C above average at Observatory Hill. Only seven days reached at least 30 °C during the summer, below the historical average of 9 days. However, only 21 days were below 25 °C, half the average of 41 cool days and the equal-fourth-fewest on record.
- Persistent thunderstorms cause locally heavy rain
- Sixth-warmest summer on record for mean minimum temperatures
- Mild summer with few cool days
- Second-longest spell of warm nights on record
|Extremes in summer 2014-15|
|Hottest day||37.7 °C at Richmond RAAF on 3 Dec 2014|
|Warmest days on average||29.4 °C at Penrith Lakes AWS|
|Coolest days on average||25.6 °C at Terrey Hills AWS|
18.5 °C at Springwood (Valley Heights) on 19 Jan 2015|
18.5 °C at Terrey Hills AWS on 28 Jan 2015
|Coldest night||10.2 °C at Camden Airport AWS on 30 Jan 2015|
|Coolest nights on average||16.9 °C at Campbelltown (Mount Annan)|
|Warmest nights on average||20.1 °C at Sydney Airport AMO|
|Warmest night||23.4 °C at Sydney Airport AMO on 23 Jan 2015|
|Warmest on average overall||24.0 °C at Penrith Lakes AWS|
|Coolest on average overall||21.8 °C at Terrey Hills AWS|
|Wettest overall||530.6 mm at Turramurra (Kissing Point Road)|
|Driest overall||276.0 mm at Willmot (Resolution Ave)|
|Wettest day||105.2 mm at Duffys Forest (Namba Rd) on 28 Jan 2015|
|Strongest wind gust||
89 km/h at Camden Airport AWS on 7 Dec 2014|
89 km/h at Richmond RAAF on 22 Dec 2014
|Summary statistics for summer 2014-15|
|Badgerys Creek AWS||28.6||-0.2||36.5||3 Dec 2014||17.6||+1.2||11.9||30 Jan 2015||307.0||248.8||high||123%|
|Bankstown Airport AWS||28.5||+0.7||37.0||25 Jan 2015||18.5||+0.9||11.5||30 Jan 2015||338.6||265.3||high||128%|
|Camden Airport AWS||28.7||-0.1||37.3||8 Feb 2015||17.0||+0.8||10.2||30 Jan 2015||330.8||239.4||high||138%|
|Campbelltown (Mount Annan)||28.4||36.2||3 Dec 2014||16.9||10.7||30 Jan 2015||264.6|
|Canterbury Racecourse AWS||26.9||-0.2||35.9||25 Jan 2015||18.1||+0.3||10.3||30 Jan 2015|
|Holsworthy Aerodrome AWS||28.0||37.3||25 Jan 2015||17.9||10.6||30 Jan 2015||242.2|
|Horsley Park Equestrian Centre AWS||28.1||-0.7||35.8||9 Jan 2015||17.6||+0.4||10.6||30 Jan 2015||349.6||247.9||high||141%|
|Parramatta North (Masons Drive)||27.8||-0.1||36.5||25 Jan 2015||17.9||+0.8||12.3||30 Jan 2015||445.0||303.5||high||147%|
|Penrith Lakes AWS||29.4||-0.4||37.3||8 Feb 2015||18.6||+0.7||13.7||30 Jan 2015||351.8||277.9||high||127%|
|Prospect Reservoir||28.5||+0.6||36.0||3 Dec 2014||18.0||+0.7||12.1||30 Jan 2015||434.3||265.7||high||163%|
|Richmond RAAF||29.1||-0.1||37.7||3 Dec 2014||18.1||+1.0||11.9||30 Jan 2015||467.6||283.7||v high||165%|
|Sydney (Observatory Hill)||26.8||+1.2||35.7||17 Jan 2015||20.0||+1.6||14.6||29 Jan 2015||341.8||296.7||average||115%|
|Sydney Airport AMO||27.6||+1.4||36.6||25 Jan 2015||20.1||+1.6||14.3||30 Jan 2015||283.6||279.9||average||101%|
|Terrey Hills AWS||25.6||-0.2||33.4||17 Jan 2015||17.9||+0.4||13.0||14 Dec 2014||403.8||321.7||high||126%|
A Seasonal Climate Summary is prepared to list the main features of the weather in Sydney using the most timely and accurate information available on the date of publication; it will generally not be updated. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review, usually published in the fourth week of the month.
A Climate Summary is generally published on the first working day of each month.
This statement has been prepared based on information available at 8 am on Monday 2 March 2015. Some checks have been made on the data, but it is possible that results will change as new information becomes available.
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
(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.
The ACORN-SAT dataset is used for temperature area averages.