Perth in autumn 2011: A record hot and sunny autumn

  • Rainfall: Mostly below average.
  • Maximum temperature: Highest on record at several sites.
  • Minimum temperature: Above to very much above average.

Rainfall

Rainfall across the Perth metropolitan area during autumn 2011 was generally below average, with moderate to heavy rainfall confined to late April, and during the middle and latter part of May. Autumn rainfall totals over the Perth coastal plain were mostly in the 80 to 120 mm range, and generally below average. Pearce RAAF observed a very low 59.2 mm over the autumn period, while Bickley recorded 142.2 mm, some 67.1 mm below the long-term average.

March rainfall in the Perth area was very much below average, with several sites (including Perth Metro), observing no rainfall for the month. April rainfall was generally below average across the Perth area with much of the recorded rainfall falling late in the month over the Easter weekend and following few days as cold fronts crossed the Perth region. Strong cold fronts crossed the southwest of WA during the middle and latter parts of May, with moderate to heavy rainfall observed across Perth. For more information regarding individual months, please refer to the reports and summaries web page.

Moderate to heavy rainfall was reported in eastern parts of the Perth metropolitan area in the 24 hours to 9am on 1 March 2011, though this rain fell during severe thunderstorms in the afternoon of 28 February. Mundaring, in the Perth hills, observed its second highest March daily rainfall on record during this event, and the highest daily total for autumn 2011, with the 82.0 mm in the 24 hours to 9am on the 1 March, only behind the 91.4 mm observed on 9 March 1934. Mundaring also observed its 5th highest March monthly rainfall, largely due to the heavy rain during the afternoon of 28 February. Aside from this event, the wettest day for most sites during autumn 2011 was 30 May when a cold front crossed the Perth area late on the 29th and on the morning of the 30th, with Madina Research Station observing 46.4 mm in the 24 hours to 9am on the 30th.

A cold front on 20 May brought moderate to heavy rainfall through the Perth area, with Perth Metro observing 20.4 mm in 41 minutes (between 0811 WST and 0852 WST), which equates to 1 in 2 to 5 year event. Rainfall totals and rates around the Perth area were similar, with Champion Lakes observing the highest 24 hour total to 9am with 30.2 mm. Localised minor flooding was reported in the Perth Metropolitan area, primarily due to blocked drainage systems.

Perth Metro received 104.4 mm on 14 rain days over autumn 2011, below the average of 181.1 mm on 22.5 rain days. Individual monthly totals for autumn 2011 were: nil rainfall in March (average 19.5 mm); 19.4 mm in April (average 44.1 mm); and 85.0 mm in May (average 117.5 mm). The wettest day at Perth Metro during autumn 2011 was 25.0 mm observed in the 24 hours to 9am on 30 May. Last autumn (2010), Perth Metro recorded 154.0 mm on 15 rain days, with 40.2 mm of this total falling during the March 22 hailstorm.

Maximum temperature

A particularly hot March and begining of April resulted in a number of sites breaking their highest autumn mean daily maximum temperature records in 2011. Daytime temperatures across Perth during autumn were 1.5 °C to 2.5 °C above normal across the Perth metropolitan region.

March in Perth was very hot, with heatwave conditions observed late in the month, and a number of sites breaking their highest March records. The hottest autumn 2011 day at a number of sites was on 25 March during an extended run of hot weather with Gosnells City observing the hottest maximum temperature of 37.5 °C. Hot conditions continued into the first week of April and returned at times during the month to see mean maxima around 2 °C above normal, whilst May saw above average maximum temperatures continue for the first half of the month before a rapid transition toward the cooler season, though mean maxima for May were approximately 1 °C above average. For more information regarding individual months, please refer to the reports and summaries web page.

Perth Metro's mean daily maximum temperature during autumn 2011 was 27.5 °C, breaking the previous record of 27.2 °C set in 1978. The autumn average is 25.8 °C. Daily maxima during autumn 2011 at Perth Metro ranged from a cool 17.7 °C on 21 May to a hot 36.4 °C on 25 March.

During autumn 2011, Perth Metro observed a total of 32 days when the maximum temperature was 30 °C or higher, breaking the previous record of 28 days observed in 1978. The average for the number of days at 30 °C or higher in autumn is 17.5 at Perth Metro, from observations beginning in 1897. The majority of these days were experienced during March and early April.

Minimum temperature

Minimum temperatures across Perth during autumn 2011 were above to very much above average, with most sites 1.0 °C to 1.5 °C above average. Rottnest Island observed its highest autumn mean daily minimum temperature in 129 years of record, while Jandakot, Bickley and Swanbourne all equalled their highest autumn mean minima.

Most of the unusually warm nights were observed through March and early April, with March minima across Perth approximately 2 °C above normal, April minima just over 1 °C above normal, and May minima approximately 0.5 °C above normal, as overnight temperatures cooled significantly in May. The warmest autumn night in the Perth metropolitan area was recorded at Pearce RAAF on 4 March with a minimum of 24.2 °C, whilst the coldest autumn night was observed at Jandakot on 21 May with 1.6 °C.

Perth Metro's mean daily minimum temperature in autumn 2011 was 14.8 °C, which is the warmest since 14.9 °C was recorded in 2005. The average for autumn is 13.6 °C. Daily minima at Perth Metro during autumn 2011 ranged from a a warm 22.8 °C on 15 March to a cold 4.5 °C on 21 May.

Wind and Sunshine

A cold front crossed the Perth region during the morning of 20 May with reports of roof and power line damage in Canning Vale at around 0800 WST. Severe wind gusts were observed at Rottnest Island from 1200 to 1300 WST, and a maximum wind gust of 96 km/h was observed at 1235 WST, which was the highest wind gust observed in the Perth region during autumn 2011.

Perth’s average daily sunshine hours during autumn 2011 was 9.2 hours, breaking the record of 8.9 hours set in 2009 mainly due to both the sunniest March and sunniest April on record. The autumn average is 8.2 hours of sunshine per day.

Further information

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Enquiries

Extremes in autumn 2011
Hottest day 37.5 °C at Gosnells City on 25 Mar
Warmest days on average 28.1 °C at Perth Airport
Coolest days on average 25.2 °C at Rottnest Island
Coldest day 15.3 °C at Bickley on 21 May
Coldest night 1.6 °C at Jandakot Aero on 21 May
Coolest nights on average 13.4 °C at Bickley
Warmest nights on average 18.3 °C at Rottnest Island
Warmest night 24.2 °C at Pearce RAAF on 4 Mar
Wettest overall 184.2 mm at Mundaring
142.2 mm at Bickley
Wettest day 82.0 mm at Mundaring on 1 Mar
46.4 mm at Medina Research Centre on 30 May
Highest wind gust 96 km/h at Rottnest Island on 20 May


Record highest autumn mean daily maximum temperature
Mean daily maximum
temperature
for autumn 2011 (°C)
Previous warmest
for autumn
Years of
record
Average for
autumn
Perth Airport 28.1 27.6 in 1994 66 25.6
Rottnest Island 25.2 25.1 in 1890 129 23.5
Jandakot Aero 27.9 27.0 in 2009 20 25.7
Bickley 25.3 25.1 in 1994 17 23.6
Perth Metro* 27.5 27.2 in 1978 114 25.8
Swanbourne 27.4 26.3 in 1994 17 25.4



Record highest autumn mean daily minimum temperature
Mean daily minimum
temperature
for autumn 2011 (°C)
Previous warmest
for autumn
Years of
record
Average for
autumn
Rottnest Island 18.3 18.1 in 1994 129 17.0
Jandakot Aero 13.8 = 13.8 in 1991 20 12.3
Bickley 13.4 = 13.4 in 2005 17 12.4
Swanbourne 16.0 = 16.0 in 2003 17 15.0


Summary statistics for autumn 2011
Maximum temperatures
for autumn
(°C)
Minimum temperatures
for autumn
(°C)
Rainfall
for autumn
(millimetres)
Mean for
autumn
2011
Diff
from
average
Highest for
autumn
2011
Mean for
autumn
2011
Diff
from
average
Lowest for
autumn
2011
Total for
autumn
2011
Average
for
autumn
Rank of
autumn
2011
Fraction of
autumn
average
Bickley 25.3 +1.7 34.2 25 Mar 13.4 +1.0 6.0 21 May 142.2 209.3 low 68%
Champion Lakes 27.0   35.1 25 Mar 16.2   6.0 21 May 114.6
Garden Island HSF 25.8   36.2 1 Mar 17.2   11.0 21 May 99.6 131.3 average 76%
Jandakot Aero 27.8 +2.2 36.1 25 Mar 13.8 +1.5 1.6 21 May 119.8 165.8 low 72%
Medina Research Centre 27.7 +2.1 36.5 16 Apr 14.7 +1.5 4.0 21 May 106.9 159.7 low 67%
Pearce RAAF 28.3 +2.1 37.0 4 Mar 14.9 +1.5 3.4 21 May 59.2 134.8 v low 44%
Perth Airport 28.1 +2.5 37.0 25 Mar 14.6 +1.5 3.1 21 May 82.0 157.0 low 52%
Perth Metro* 27.5 +1.7 36.4 25 Mar 14.8 +1.2 4.5 21 May 104.4 181.1 low 58%
Rottnest Island 25.2 +1.7 34.4 1 Mar 18.3 +1.3 11.8 21 May 100.0 156.7 low 64%
Swanbourne 27.4 +2.0 37.0 1 Mar 16.0 +1.0 7.3 21 May 114.4 147.6 average 78%

Daily maximum temperature
Central Coast (09) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Bickley 32.3 30.0 32.0 33.5 28.6 26.1 27.4 29.8 32.5 32.4 26.7 25.8 28.1 32.4 33.1 30.4 30.8 30.4 28.2 27.1 29.2 31.3 31.6 32.5 34.2 33.0 32.7 32.2 30.7 29.9 29.0 28.9 27.7 29.1 30.9 32.6 30.2 19.9 21.1 23.3 26.4 22.0 21.5 22.7 24.4 28.2 33.2 25.2 22.9 24.2 23.2 26.2 30.2 25.8 22.9 24.3 24.6 18.7 17.8 20.4 20.7 22.2 22.7 23.3 24.0 22.8 20.2 22.0 26.6 24.5 22.2 20.4 20.4 20.3 19.8 19.9 21.4 20.0 18.9 21.4 16.2 15.3 17.7 18.8 17.0 17.9 18.0 19.9 22.3 22.4 18.1 17.6
Champion Lakes 34.2 32.1 33.8 33.9 28.3 26.4 27.6 30.3 33.4 32.0 27.2 27.0 29.8 34.3 34.2 32.1 31.9 31.0 28.3 29.5 30.8 31.9 34.9 35.1 34.8 33.9 33.0 32.6 32.4 30.9 30.2 29.7 30.9 32.7 33.6 30.3 21.8 23.0 25.1 28.4 23.9 23.7 24.4 25.8 30.3 34.2 26.3 24.6 26.3 24.9 28.2 31.2 26.1 24.7 25.7 25.3 22.0 19.9 23.0 22.3 23.7 24.8 25.6 26.3 24.3 22.9 24.9 28.4 25.5 24.4 22.8 22.6 22.3 21.6 22.4 23.8 22.2 20.5 23.9 18.0 17.4 19.5 21.7 19.6 19.6 20.4 22.2 25.3 24.0 20.9 20.9
Garden Island HSF 36.2 33.9 32.5 33.3 25.6 24.2 24.0 24.8 25.6 26.5 25.7 23.3 29.7 32.7 34.9 34.7 27.8 27.1 24.2 23.6 30.4 29.8 25.2 27.9 30.2 32.8 31.2 26.9 28.4 30.9 29.4 32.6 31.2 29.1 32.6 33.7 26.9 22.4 21.3 26.3 28.6 24.8 24.8 22.6 24.0 30.5 33.3 23.8 23.4 21.7 24.1 28.1 30.2 26.4 24.7 25.0 25.2 21.5 20.1 20.2 21.2 22.6 21.7 25.3 24.8 24.6 20.8 25.8 28.4 21.5 24.9 23.7 23.4 23.6 22.0 23.3 24.2 21.6 21.7 23.7 20.2 17.5 19.1 19.4 21.5 21.8 22.3 21.2 22.2 23.7 21.5 21.8
Gosnells City 35.3 35.8 36.5 30.0 26.0 29.2 32.0 34.4 33.9 29.0 31.4 36.6 33.9 32.0 32.5 32.4 33.2 33.2 36.4 37.5 37.0 35.5 34.8 34.2 33.5 31.5 33.0 34.3 35.8 32.2 23.0 24.5 26.5 30.2 25.5 25.0 25.8 27.0 31.5 36.6 30.7 26.2 27.2 25.8 32.5 28.0 27.0 28.0 26.9 23.0 21.3 25.0 23.5 25.0 26.1 26.6 27.5 26.0 23.7 26.1 30.6 26.5 25.8 24.0 24.2 24.0 23.0 23.4 25.7 23.3 22.2 25.5 18.5 18.0 21.2 22.2 20.3 21.2 21.5 24.0 26.0 25.8 22.6 21.7
Jandakot Aero 36.0 33.7 35.2 35.9 29.8 27.6 28.1 30.8 32.7 32.2 27.9 27.8 31.1 35.9 36.1 34.6 31.2 30.8 29.1 29.2 31.5 33.0 32.1 35.4 36.1 35.6 34.4 33.5 33.8 33.0 32.5 31.9 30.8 32.2 33.7 35.3 30.4 23.1 23.6 26.6 29.7 25.5 24.8 25.9 26.4 31.5 36.0 26.5 25.7 25.9 26.0 29.0 31.1 28.0 25.6 26.2 26.2 22.9 20.5 23.3 23.4 24.6 25.1 26.3 26.2 25.8 23.1 25.8 29.5 25.9 25.2 23.6 23.5 23.4 22.4 23.5 25.0 23.3 21.2 24.8 18.3 17.9 20.6 22.1 20.6 21.0 21.3 23.2 24.8 25.0 22.3 22.6
Medina Research Centre 36.1 33.9 35.7 36.4 28.0 26.7 27.3 29.0 31.3 32.0 26.8 26.8 31.2 35.1 36.3 34.3 30.7 30.0 27.8 28.5 31.8 32.5 30.3 35.2 35.3 36.0 34.2 31.6 33.4 32.8 32.0 32.3 31.2 31.8 34.5 36.4 22.3 23.8 26.2 29.1 26.2 25.2 24.9 25.1 31.6 36.5 25.9 25.2 25.1 25.8 29.5 31.1 28.3 26.9 27.0 27.2 23.0 21.2 23.3 23.0 23.7 25.0 27.6 27.0 26.2 23.6 26.4 30.5 25.5 24.0 23.6 23.9 22.1 23.2 25.9 22.8 22.5 25.6 18.5 18.0 21.0 22.0 21.9 21.0 21.9 24.0 24.8 23.1
Pearce RAAF 35.2 33.1 34.8 37.0 30.3 28.5 30.0 32.4 34.9 35.2 29.1 28.9 30.9 35.2 35.8 33.8 34.0 32.8 30.6 30.5 32.5 34.1 35.2 36.2 36.2 35.1 34.4 34.8 34.2 32.9 32.1 31.2 30.0 31.6 33.9 36.0 33.4 24.1 24.2 25.9 30.1 25.7 25.9 25.7 27.0 31.3 36.1 28.6 25.2 27.5 26.3 29.8 34.3 30.4 27.5 27.8 28.1 23.5 20.9 23.1 23.5 24.7 25.6 26.1 26.4 26.0 23.4 25.2 29.8 26.8 25.4 23.8 23.5 23.3 21.9 21.0 24.2 22.9 21.5 24.9 18.1 18.1 21.2 21.5 19.6 20.2 20.3 22.4 26.0 25.8 21.3
Perth Airport 35.6 33.1 35.1 36.4 29.4 28.0 28.7 31.4 33.3 32.7 28.6 28.3 31.1 35.4 35.6 33.8 32.7 31.2 29.7 29.7 32.1 34.0 32.0 36.0 37.0 35.6 34.8 34.9 33.9 32.9 32.4 31.7 30.7 31.9 33.6 35.8 31.0 23.8 24.1 26.4 30.5 25.0 25.5 25.9 26.8 31.4 36.3 27.9 26.4 27.0 26.1 29.3 32.7 28.2 25.7 26.7 27.2 22.3 20.5 24.1 23.6 24.6 26.0 26.7 26.9 25.7 23.4 25.7 29.9 26.7 25.6 23.7 23.6 23.3 22.9 22.3 24.8 23.1 21.7 25.4 18.2 18.2 21.9 22.0 19.9 20.8 21.1 23.1 25.3 25.6 21.9 21.2
Perth Metro 34.8 33.0 34.3 35.1 29.0 26.6 28.0 29.7 32.2 32.0 27.6 27.0 30.8 34.9 35.4 33.4 32.0 29.9 28.1 27.8 31.5 32.1 31.2 35.2 36.4 35.1 34.2 33.7 32.9 32.5 31.7 31.1 30.3 31.4 33.6 34.7 30.5 22.4 23.5 26.0 29.3 24.8 24.6 24.8 25.8 30.8 35.7 27.2 26.3 25.3 25.6 28.9 32.3 27.2 25.6 26.6 26.1 22.2 20.6 23.1 23.0 24.2 25.3 26.5 26.5 25.0 23.0 25.2 30.0 25.3 25.3 23.5 23.3 23.0 22.6 21.8 24.0 22.4 20.9 24.8 18.5 17.7 20.6 21.2 20.5 20.5 21.5 22.8 24.8 24.6 21.7 21.2
Rottnest Island 34.4 30.2 32.9 31.9 26.4 25.2 24.6 25.5 26.2 26.9 25.4 24.5 27.4 31.0 33.0 31.3 27.3 27.3 25.4 23.9 28.3 27.9 27.5 30.9 32.3 30.5 26.4 26.8 29.2 28.5 29.4 29.1 30.3 32.0 31.9 26.3 22.5 21.1 24.8 28.4 24.8 24.8 23.0 23.8 29.8 31.5 24.3 22.6 22.0 22.9 26.0 28.3 26.0 25.5 24.6 24.8 21.6 20.2 20.4 21.3 21.9 22.5 25.2 24.5 24.1 20.0 24.0 27.4 21.7 23.5 21.9 21.2 22.0 21.1 21.9 23.0 21.6 20.9 23.4 19.5 16.9 18.8 19.0 21.4 19.6 20.3 20.8 22.6 23.0 21.9 22.0
Swanbourne 37.0 34.3 35.5 28.2 27.0 26.7 28.2 29.2 30.0 26.9 26.7 31.9 36.8 36.8 34.8 30.0 28.1 26.9 27.1 32.2 30.0 27.5 33.1 36.0 33.1 32.7 28.9 31.0 33.6 32.4 32.6 31.0 32.7 33.7 34.6 27.4 22.6 24.5 26.2 30.5 25.6 24.9 24.9 27.1 31.7 34.5 27.1 26.7 24.9 26.5 29.9 33.2 27.1 26.1 25.6 25.6 22.9 21.1 23.9 23.1 25.0 25.8 26.5 25.3 25.1 23.8 26.0 29.6 24.8 26.2 24.4 24.3 23.9 22.9 22.3 24.5 23.2 22.4 24.5 19.4 18.4 20.0 21.3 21.8 21.3 22.0 23.4 23.4 23.8 22.2 22.5

This table is very wide; you may have to scroll sideways to see all the days, and you may need to set the paper to 'landscape' to print.
The temperatures in this table are coloured by
their difference from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C difference from average


Daily minimum temperature
Central Coast (09) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Bickley 17.6 16.9 15.9 19.4 19.0 15.6 13.7 14.2 15.0 17.8 14.4 13.7 12.6 15.0 18.7 15.7 17.5 17.3 17.0 13.6 13.1 17.8 18.5 17.1 16.8 17.8 17.2 18.0 15.5 15.1 14.8 14.7 13.4 15.1 15.2 16.6 19.3 13.0 8.6 8.6 11.8 15.3 14.5 11.9 10.5 11.6 16.2 19.6 15.8 10.2 11.4 12.3 12.8 17.4 19.0 14.0 13.2 14.2 8.7 9.0 9.7 10.5 10.4 10.5 11.4 11.6 10.4 8.5 11.7 14.0 11.5 10.4 7.7 8.6 9.3 12.0 13.1 14.1 11.1 8.9 12.8 6.0 8.9 8.8 9.7 9.6 9.6 7.9 8.5 10.1 13.4 11.8
Champion Lakes 21.5 21.0 20.1 24.0 22.2 16.7 17.5 17.8 18.8 20.2 17.0 17.6 16.5 19.4 22.8 20.0 21.5 21.1 17.4 16.6 17.2 20.6 20.9 20.7 21.6 19.6 19.8 19.2 19.2 18.9 18.3 17.5 19.6 19.0 18.4 16.8 15.5 10.7 12.4 16.2 18.5 17.0 13.8 14.4 15.4 20.9 19.9 18.9 13.7 14.6 15.1 16.9 18.1 20.8 14.9 14.3 17.2 10.8 11.1 12.5 12.5 14.1 14.2 14.1 12.0 12.8 12.7 15.8 13.7 15.2 14.5 11.9 12.9 13.5 16.4 16.8 14.5 11.6 10.9 16.8 6.0 7.7 9.5 10.7 13.2 12.3 12.0 11.5 11.5 15.4 14.2
Garden Island HSF 22.0 21.5 20.6 22.6 22.6 19.1 17.8 18.7 18.9 21.5 18.9 17.4 16.7 19.8 23.2 20.5 21.3 20.2 20.6 18.1 17.6 22.0 20.6 20.5 21.4 20.8 18.0 18.4 19.8 19.3 19.8 19.3 18.2 19.8 20.3 17.5 16.5 15.1 13.5 13.4 17.1 20.1 19.7 17.0 16.8 16.1 20.4 20.0 18.1 13.9 14.8 16.5 18.3 17.0 21.6 18.1 16.1 18.4 15.4 12.4 13.5 13.8 14.7 15.0 14.7 13.0 14.1 13.5 17.0 16.7 15.4 14.3 12.9 13.8 14.5 17.1 16.8 15.7 14.3 14.1 17.1 11.0 11.2 13.3 11.6 14.5 13.1 13.3 11.6 12.9 15.9 16.5
Gosnells City 20.7 22.7 20.4 22.0 16.5 17.0 16.9 19.0 19.9 16.1 16.7 19.6 20.0 21.5 16.0 15.5 16.5 19.8 21.4 21.5 18.0 17.1 19.2 19.2 18.2 19.8 20.4 11.0 15.0 18.0 15.9 12.6 13.1 15.0 21.0 19.7 18.7 13.9 15.2 15.4 17.5 16.0 14.0 13.4 16.9 10.4 9.2 9.5 10.0 10.2 17.9 11.6 9.2 12.8 12.4 15.4 12.0 12.6 11.0 12.1 10.2 17.2 5.0 6.0 7.8 9.8 12.2 12.4 9.0 9.0 9.0 13.9
Jandakot Aero 21.4 21.1 19.7 19.6 21.5 15.4 15.2 16.3 18.2 17.0 12.9 14.9 15.9 19.4 22.6 19.9 20.7 17.2 16.6 14.9 16.8 20.1 17.5 18.7 20.2 19.6 13.2 13.8 17.2 18.7 18.6 17.4 17.1 17.8 15.5 11.2 12.6 15.0 5.4 10.0 16.3 18.8 17.8 9.9 10.6 10.7 19.6 17.6 18.5 13.1 8.9 9.7 16.4 15.5 18.9 13.3 10.2 17.4 10.3 6.6 7.2 6.7 9.2 12.1 7.7 6.3 8.6 11.2 15.7 11.3 14.7 13.4 9.3 12.2 12.7 16.1 11.9 11.7 7.8 5.2 15.1 1.6 2.6 4.2 6.9 7.7 10.0 11.8 5.0 5.0 15.3 12.3
Medina Research Centre 21.6 21.0 19.9 21.5 22.3 14.7 16.2 17.0 16.5 15.5 14.0 15.4 16.4 18.8 22.8 20.2 20.6 16.8 20.4 20.8 21.1 16.0 13.4 18.9 19.1 18.6 17.9 16.9 20.0 18.6 13.0 13.7 14.4 9.0 11.8 16.6 19.8 19.2 11.9 12.6 13.2 15.5 17.7 12.9 10.3 13.0 17.0 14.1 20.3 14.3 12.3 17.7 11.5 7.0 9.5 8.2 11.8 12.0 10.8 8.4 10.4 12.5 16.0 14.0 13.6 8.4 12.5 12.1 16.7 14.0 12.7 11.1 9.9 15.4 4.0 5.4 6.4 7.4 11.5 11.6 11.2 8.7 6.5 15.1
Pearce RAAF 21.8 21.8 20.5 24.2 21.8 16.0 15.9 17.0 17.9 15.1 15.8 16.1 16.9 20.6 22.9 19.9 20.9 17.5 15.6 13.9 17.4 21.7 14.4 18.4 21.2 22.0 14.4 11.4 17.6 18.6 19.4 18.7 18.5 20.0 21.2 14.8 13.0 15.2 10.3 13.3 16.9 17.9 15.8 14.2 10.6 9.2 21.2 18.3 19.3 13.5 13.3 15.6 18.5 16.5 17.9 12.4 10.5 15.2 10.9 9.8 7.2 7.0 10.0 9.9 10.1 7.0 12.7 14.0 16.5 9.9 15.9 13.4 10.5 11.3 11.6 15.8 15.6 14.9 8.3 13.2 17.3 3.4 3.8 6.2 7.5 13.1 14.0 13.3 8.6 7.5 15.5
Perth Airport 21.3 20.5 19.6 21.5 22.2 16.4 17.4 18.1 18.0 17.1 13.9 17.5 16.5 18.8 22.8 19.3 20.7 19.0 15.7 16.6 16.8 20.9 16.2 19.5 20.9 21.8 15.6 12.5 19.1 18.5 18.5 16.6 17.2 15.9 17.5 13.3 13.9 14.4 7.5 11.2 16.1 18.4 17.2 11.1 11.5 10.9 20.6 18.1 19.3 14.1 11.4 11.7 17.0 17.7 18.8 13.5 12.0 15.7 9.6 7.4 6.5 7.4 10.3 10.5 10.2 9.8 14.1 11.5 15.2 9.7 15.2 14.0 9.1 11.4 12.7 14.8 15.7 12.4 8.8 10.5 15.6 3.1 4.1 4.4 6.8 12.2 11.5 12.0 10.8 8.0 15.3 12.6
Perth Metro 21.3 20.7 19.5 20.8 22.3 17.8 17.1 15.3 17.7 17.3 16.7 16.9 16.2 19.1 22.8 19.4 20.7 17.6 18.1 16.9 16.7 19.4 19.7 20.6 20.9 20.6 14.1 14.4 18.7 18.5 18.4 18.1 17.1 16.9 14.8 13.1 15.4 14.7 9.0 12.3 16.6 19.3 19.4 13.3 12.8 11.1 20.5 18.9 19.1 14.0 11.1 10.3 16.7 17.4 19.2 14.3 12.8 17.1 12.9 8.0 7.9 8.3 10.5 11.3 9.8 8.9 12.3 12.4 15.5 12.9 15.3 13.4 10.9 12.2 12.8 15.0 14.0 14.5 9.7 7.5 15.6 4.5 4.9 5.4 6.9 10.3 12.2 11.6 7.2 6.7 15.2 12.0
Rottnest Island 22.2 22.0 21.1 23.8 22.5 20.0 18.5 19.0 19.4 22.2 20.2 18.6 17.2 20.3 23.6 20.8 21.2 21.6 21.7 18.5 18.0 21.2 21.1 21.2 22.8 22.6 22.0 21.2 20.3 19.8 20.3 20.1 19.3 21.0 22.1 21.6 22.0 15.6 15.3 14.2 16.8 19.9 19.2 17.7 17.8 17.3 20.5 22.3 18.6 15.8 16.5 17.4 19.2 20.8 22.2 18.5 19.0 17.2 14.3 14.4 15.1 15.6 15.7 16.5 17.4 17.7 15.2 14.4 16.5 18.9 16.1 14.8 15.0 15.2 15.5 16.1 17.4 17.9 15.3 16.3 16.9 11.8 13.9 14.0 13.3 15.1 15.2 14.3 15.2 16.4 16.5 16.2
Swanbourne 21.8 20.9 20.2 22.1 21.7 17.8 17.3 16.1 17.2 19.0 16.8 15.9 15.8 19.1 23.4 19.7 20.7 19.2 18.1 16.5 16.7 20.1 19.6 20.6 21.9 21.5 18.5 16.4 18.6 18.9 18.9 18.1 17.5 19.3 19.5 17.9 17.9 14.1 11.7 12.6 16.8 19.3 18.9 14.4 14.7 13.2 21.1 19.9 18.2 13.9 13.3 13.3 17.4 19.1 21.1 15.3 14.8 18.4 14.5 10.4 11.3 10.7 12.9 13.0 13.1 12.8 11.6 12.7 15.5 14.7 15.0 13.3 12.0 12.6 13.3 15.4 14.8 15.3 12.1 10.7 16.4 7.3 8.2 10.0 9.7 11.9 12.0 12.2 10.8 9.2 15.1 16.7

This table is very wide; you may have to scroll sideways to see all the days, and you may need to set the paper to 'landscape' to print.
The temperatures in this table are coloured by
their difference from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C difference from average


Daily rainfall
Central Coast (09) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Bickley 4.2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 0.6 4.4 - - 3.8 0.8 - - - - - - - - - - - - 2.2 - 6.4 15.8 - - - - - - - - - - - - - - - - 0.2 - - 4.4 0.2 27.8 25.4 - - - - - - - - 28.2 17.8
Champion Lakes 19.2 0.2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2.4 - - - 1.0 - 0.2 0.2 - - - - - - - - - - 0.4 0.2 4.0 19.8 - - - - - - - - - - - - - - - - - 0.8 0.2 4.8 0.2 30.2 10.6 - - - - - - - - 17.8 2.4
Garden Island HSF - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4.2 0.2 - - - 0.2 0.2 - - - - - - - - - - 0.8 3.0 0.2 7.2 3.4 1.0 0.2 - - - - - - - - - - - - - - - - 3.4 11.4 - 10.8 9.8 - - - - - - - - 37.4 6.2
Gosnells City 19.0 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2.0 0.6 - - 3.6 0.6 - - - - - - - - - - - 1.0 - - 9.0 11.0 - - - - - - - - - - - - - - - »» »» 1.2 0.4 5.8 0.1 19.0 8.7 1.0 1.0 - - - - - - 18.0 5.4
Jandakot Aero - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2.2 0.8 - - 2.8 0.4 - - - - - - - - - - - 4.2 5.0 - 4.0 14.2 0.6 - - - - - - 0.6 0.2 - - - - - - - - 1.0 - 6.6 - 29.4 9.6 - - - - - - - - 35.0 3.2
Jarrahdale 9.6 - - - - - - - - - - - - - - - - - - 0.2 - 0.4 - - - - - - - - - - - - - - - 3.6 4.4 - - 0.8 0.4 - 0.2 0.2 - - - 0.2 - - - - - 9.0 0.2 11.0 23.0 0.2 0.2 - 0.4 0.2 0.2 - 0.2 0.2 - - - - - - - - - 0.2 3.2 0.2 23.2 18.8 0.4 0.2 - - - - 0.2 0.2 24.4 4.0
Medina Research Centre 0.2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3.4 1.1 - - 1.6 1.4 - 0.2 - - - - - - - - - - 1.2 - 4.8 5.4 2.6 - - - - - - - - - - - - - - - - 0.4 0.8 8.8 - 11.6 11.2 - - - - - - - - 46.4 5.8
Mundaring 82.0 - - - - - - - - - - - - - - - - - 0.2 - - 0.2 - - - - - - - - - - - - - - - 1.0 0.4 - - 3.8 2.8 - 0.2 - - 0.4 - - - - - - - 1.6 0.2 9.2 17.2 - 0.2 0.2 0.2


0.2



0.2


0.4 1.4 0.8 5.0 0.2 4.0 23.2 0.2 0.2 0.2




23.0 5.4
Pearce RAAF - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 0.8 0.4 »» »» 2.4 0.4 - - - - - - - - - - - - - - 1.6 11.8 - - - - - - - 0.8 -
- - - - - - - - 0.4 5.2 - 1.2 10.6 - - - - - - - - 21.4 2.2
Perth Airport - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1.0 0.2 - - 2.2 0.6 - - - - - - - - - - - 3.0 0.2 - 6.2 12.0 - - - - - - - - - - - - - - - - - 0.2 0.4 4.8 - 16.4 11.6 - - - - - - - - 18.2 5.0
Perth Metro - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2.0 0.2 - - 2.2 - - - - - - - - - - - - 0.4 0.8 - 9.6 4.2 - - - - - - - - - - - - - - - - - 0.8 1.6 8.2 - 24.2 14.6 - - - - - - - - 25.0 10.6
Roleystone 2.6 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1.2 1.4 - - 3.8 1.2 0.2 - - - 0.2 - - - - - - - 3.0 - 8.8 26.0 - -













0.2 0.4 0.2













Rottnest Island - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 0.2 4.2 - - - 0.4 - - - - - - - - - - - - - 1.0 - 6.6 1.4 - - - - - - - - - - - - - - - - - 0.2 2.4 12.0 - 15.8 9.2 - - - - - - - - 45.4 1.2
Serpentine 0.4 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2.4 4.6 - - 2.6 0.2 - - - - - 0.2 - - - - - 0.2 6.8 - 6.2 7.6 0.2 - - - - - - - - - - - - - - - - 0.2 - 4.8 - 15.2 12.8 - - - - - - - - 34.6 8.8
Swanbourne - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3.2 - - - 3.4 0.4 - - - - - - - - - - 0.2 1.0 0.6 - 4.2 6.6 0.2 - - - - - - - - - - - - - - - - 0.6 8.4 11.2 - 28.2 13.4 - 0.2 - - - - - - 28.0 4.6

Most values are the precipitation in the 24 hours to 9 am on the day indicated. Days marked with »» are part of a longer accumulation, which is marked like this on the final day. Values over 100 mm have been rounded to the nearest whole millimetre. Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell).
This table is very wide; you may have to scroll sideways to see all the days, and you may need to set the paper to 'landscape' to print.


Notes

This statement was prepared before all data for the period were available. This may affect some of the statistics presented.

A Seasonal Climate Summary is prepared to list the main features of the weather in Perth 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.

This statement has been prepared based on information available at 2 pm on Wednesday 1 June 2011. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Averages 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.
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.

Records in this summary are based on sites with at least 10 years of data.

*Official Perth observations have been recorded at several different sites with varying instrumentation over the years, and these changes can affect the continuity of the climate record. For the current Mt Lawley site, the most significant changes of this kind relate to minimum temperature and rain days.

For that reason, current mean temperature and rain-day data quoted here are based only on readings from the Mt Lawley site, which commenced observations in 1993. Sunshine recordings are from Perth Airport and for similar reasons current means use only Perth Airport data, which commenced in 1993.

For PDF files of Perth Metro climate statistics for other months, please click here for extremes and here for averages.

Further information

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