Sydney has about 1200mm of rain in an average year, with the majority falling during the Winter period, although the difference between seasons appears minimal.
- 620mm During the April to September period which includes Winter
- 580mm During the October to March period which includes Summer
The average number of rain days is about 138 per year. However, a rain day may actually include a day when 3mm dropped in the middle of the night.
There have been some years where the Sydney rainfall averages have been well and truly broken, and some of these are:
Record Rainfall in Sydney (Daily)
191.0 mm – 17 January 1988
243.6 mm – 3 February 1990
280.7 mm – 28 March 1942
191.0 mm – 29 April 1860
212.3 mm – 28 May 1889
150.6 mm – 11 June 1991
198.1 mm – 7 July 1931
327.6 mm – 6 August 1986
144.5 mm – 10 September 1879
161.8 mm – 13 October 1902
234.6 mm – 9 November 1984
126.0 mm – 9 December 1970
Record Rainfall in Sydney (Monthly)
387.1 mm – January 1911
630.6 mm – February 1990
521.4 mm – March 1942
622.1 mm – April 1861
585.0 mm – May 1919
642.7 mm – June 1950
336.1 mm – July 1950
482.6 mm – August 1998
355.8 mm – September 1879
285.0 mm – October 1987
517.2 mm – November 1961
401.9 mm – December 1920
Source: Bureau of Meteorology