Perth in June 2011: An average June

This statement was prepared before all data for the period were available. This may affect some of the statistics presented.
  • Rainfall: Near average to above average for most sites.
  • Maximum temperature: Near average across the Perth area.
  • Minimum temperature: Above average for most sites.

Rainfall

Rainfall in June 2011 was near average for most of sites, with monthly rainfall totals across the metropolitan area generally in the 100-200 mm range.

A strong cold front produced moderate to heavy rainfall at the start of June, with daily rainfall totals of 20 to 40 mm recorded in the 24 hours to 9 am on the 2nd on the mainland. Some damage was reported in Perth, mainly due to flash flooding. After a lengthy break, a series of cold fronts passed through the Perth area in the second half of June bringing much anticipated rainfall. The most significant falls occurred in the late afternoon of the 24th through to the early morning of the 25th, with many sites registering daily rainfall totals in the 50 to 60 mm range. As a result, flash flooding caused some property damage. Swanbourne recorded 32.6 mm in 30 minutes (between 1745 WST and 1814 WST) on the 24th, which equates to a 1 in 50 to 1 in 100 year event, whilst Swanbourne's 24 hour rainfall total of 63.8 mm to 9 am on the 25th exceeded the previous highest daily total for June in 18 years of record, which was 53.0 mm on 4 June 2002.

Perth Metro recorded 171.4 mm of rainfall on 14 days during June 2011, which is the wettest June for 6 years since 251.0 mm was recorded on 19 rain days in 2005. Despite this, the total rainfall for the six months from January to June 2011 at Perth Metro was still below average, with 306.4 mm recorded on 35 rain days. The long-term average for this period is 379.0 mm on about 42 days, while the total for the same period last year was 205.6 mm on 23 days.

Maximum temperature

Daytime temperatures during June 2011 were near average across the Perth metropolitan area. Mean daily maximum temperatures were in the 19 to 20 °C range for most sites, and generally less than 1 °C above normal. The warmest day of the month was the 27th, with daily maximum temperatures in low to mid 20s, as Gosnells City recorded the highest daily maximum in the Perth metropolitan area for June 2011 with 24.8 °C.

Perth Metro's mean maximum temperature in June 2011 was 19.5°C, which is near the average of 19.3 °C. Daily maxima ranged from a cool 14.2 °C on the 14th, which was Perth Metro's coolest June day since 12.8 °C was recorded on 23 June 2009, to 24.3 °C on the 27th.

Perth Metro's mean maximum temperature for the 6 months (January to June ) period was 28.1 °C, which is the warmest January to June period since records commenced in Perth in 1897. The previous record for the same period was 27.6 °C in 1978, whilst the average is 26.5 °C.

Minimum temperature

Overnight temperatures during June 2011 were above average across the Perth area. Mean daily minimum temperatures were in the 9 to 14 °C range, and generally 1 to 2 °C above normal. The coldest night of the month for many sites was on the 6th, with several sites registering daily minima temperatures 5 °C or lower, and Jandakot Aerodrome recorded the lowest minimum in Perth in June 2011 with 1.3°C.

Perth Metro's mean minimum temperature in June was 10.0 °C, which is above the average of 8.5 °C, and the warmest June for 7 years, since 10.6 °C was recorded in 2004. Minima at Perth Metro ranged from a cold 3.3 °C on the 6th, to a mild 15.0 °C on the 20th, the highest overnight minimum for June at Perth Metro in three years, since 15.1 °C was recorded on 1 June 2008.

Wind and sunshine

Severe wind gusts were observed at Rottnest Island in the early morning on the 14th as a maximum wind gust of 91 km/h was observed at 0653 WST when a cold front crossed the Perth region. The was the strongest wind gust reported in the region in June 2011.

Perth recorded an average daily sunshine of 5.6 hours in June 2011, which is the least sunshine hours for Perth in June for 6 years, since 4.8 hours per day was recorded in 2005. The average sunshine for Perth in June is 6.0 hours per day.

Further information

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Extremes in June 2011
Hottest day 24.8 °C at Gosnells City on the 27th
Warmest days on average 20.0 °C at Gosnells City
20.0 °C at Swanbourne
Coolest days on average 16.4 °C at Bickley
Coldest day 11.4 °C at Bickley on the 14th
Coldest night 1.3 °C at Jandakot Aero on the 6th
Coolest nights on average 9.0 °C at Bickley
Warmest nights on average 14.1 °C at Rottnest Island
11.5 °C at Champion Lakes (mainland)
Warmest night 16.4 °C at Garden Island HSF on the 20th
16.3 °C at Medina Research Centre on the 20th (mainland)
Wettest overall 211.4 mm at Jarrahdale
Wettest day 63.8 mm at Swanbourne on the 25th
Highest wind gust 91 km/h at Rottnest Island on the 14th
87 km/h at Pearce RAAF on the 24th

Record highest June daily rainfall
Highest daily rainfall
in June 2011 (mm)
Previous highest
for June
Years of
record
Swanbourne 63.8 on the 25th 57.0 on the 19th in 1996 18



Summary statistics for June 2011
Maximum temperatures
for June
(°C)
Minimum temperatures
for June
(°C)
Rainfall
for June
(millimetres)
Mean for
June
2011
Diff
from
average
Highest for
June
2011
Mean for
June
2011
Diff
from
average
Lowest for
June
2011
Total for
June
2011
Average
for
June
Rank of
June
2011
Fraction of
June
average
Bickley 16.4 +0.4 20.8 27th 9.0 +1.0 6.2 11th 196.8 205.1 average 96%
Champion Lakes 19.0   23.3 27th 11.5   7.9 8th 158.8
Garden Island HSF 19.4   22.5 27th 13.0   8.9 6th 126.8 120.0 average 106%
Gosnells City 20.0 +0.4 24.8 27th 11.2 +1.5 7.7 17th 179.0 175.2 average 102%
Jandakot Aero 19.7 +0.8 24.4 27th 9.3 +2.0 1.3 6th 203.2 162.2 high 125%
Medina Research Centre 19.7 +0.4 24.4 27th 10.8 +1.9 4.0 6th 159.4 148.1 average 108%
Pearce RAAF 19.5 +0.7 23.7 27th 10.4 +1.0 5.2 8th 112.4 136.1 average 83%
Perth Airport 19.8 +0.9 24.3 27th 10.0 +1.0 4.2 6th 137.6 162.4 average 85%
Perth Metro* 19.6 +0.3 24.3 27th 10.0 +1.6 3.3 6th 171.4 175.7 average 98%
Rottnest Island 19.1 +0.5 21.8 27th 14.1 +0.9 12.1 4th 118.8 148.9 average 80%
Swanbourne 20.0 +0.7 24.5 27th 11.5 +1.0 7.4 6th 183.2 130.2 high 141%

Daily maximum temperature
Central Coast (09)123456789101112131415161718192021222324252627282930
Bickley17.116.515.914.215.416.715.116.516.517.517.017.614.011.415.916.916.316.716.616.617.117.919.019.416.216.920.813.615.0
Champion Lakes20.618.718.216.818.518.817.419.319.519.719.220.118.313.919.119.518.820.218.619.019.520.120.522.118.619.323.316.217.7
Garden Island HSF21.718.317.916.718.919.719.520.920.219.919.520.517.918.119.119.318.820.719.219.418.919.719.821.618.718.922.518.417.0
Gosnells City21.219.619.217.019.520.418.920.220.620.820.521.518.114.420.220.021.020.520.420.521.621.923.019.220.524.816.318.7
Jandakot Aero21.119.318.617.318.719.919.320.620.220.719.821.417.814.420.020.019.220.720.220.119.920.520.922.619.119.324.417.017.0
Medina Research Centre20.819.318.917.019.419.919.420.620.019.720.021.217.514.619.919.718.721.219.120.320.021.220.022.618.719.924.417.8
Pearce RAAF21.619.818.917.319.118.019.519.620.019.620.817.814.120.119.220.219.819.620.320.320.822.122.518.419.023.715.717.0
Perth Airport21.019.819.417.218.819.718.319.820.320.619.821.018.214.019.520.120.020.720.020.720.920.922.223.118.820.424.315.618.2
Perth Metro21.419.418.517.018.619.818.819.919.920.119.820.817.514.219.619.420.320.919.719.820.521.121.322.619.219.524.316.218.4
Rottnest Island21.318.117.516.017.518.417.819.119.118.619.620.418.517.719.819.618.720.619.220.119.119.520.821.519.018.621.818.218.4
Swanbourne21.420.019.317.619.620.419.220.320.520.319.921.317.416.420.220.020.520.620.320.521.220.720.422.319.220.224.517.318.7

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 minimum temperature
Central Coast (09)123456789101112131415161718192021222324252627282930
Bickley13.111.07.76.96.96.66.57.49.57.46.27.17.87.77.910.18.211.110.812.111.08.210.612.99.29.27.612.18.98.5
Champion Lakes15.113.79.69.89.09.49.47.913.212.012.012.812.610.611.112.59.212.012.113.612.510.612.014.610.710.811.114.511.010.9
Garden Island HSF16.214.812.710.510.38.910.712.113.112.312.513.513.011.812.614.611.814.516.116.413.412.714.615.014.512.212.415.911.710.1
Gosnells City14.713.88.410.510.38.08.28.613.411.711.012.012.310.310.87.712.512.013.811.99.210.910.410.411.814.410.713.2
Jandakot Aero14.111.55.65.91.81.37.74.612.79.410.410.68.810.210.411.95.412.310.414.910.86.810.913.19.19.76.414.810.18.0
Medina Research Centre15.012.68.26.54.44.08.15.613.09.411.211.510.610.411.411.87.812.413.116.312.58.813.513.514.010.310.515.411.0
Pearce RAAF13.814.08.710.09.67.69.35.212.810.311.011.610.010.110.911.07.211.111.013.010.57.36.511.69.99.012.214.611.010.2
Perth Airport14.413.46.67.97.04.28.35.113.210.711.210.310.09.910.311.68.012.111.311.910.67.98.014.09.68.68.813.910.29.5
Perth Metro14.613.87.77.04.63.35.86.012.310.010.412.08.810.110.212.76.611.711.315.011.48.710.313.311.09.47.914.310.99.8
Rottnest Island16.315.614.212.112.512.212.212.613.813.213.514.013.612.912.814.614.314.815.915.815.014.716.016.113.513.414.515.512.913.6
Swanbourne14.713.09.48.68.07.48.08.612.810.410.811.811.49.810.014.49.313.315.515.412.810.211.915.012.710.610.715.411.210.9

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)123456789101112131415161718192021222324252627282930
Bickley 8.6 39.8 - - - - - - - - - - - 11.0 12.6 9.2 0.2 2.6 3.2 2.8 1.0 - - 0.4 53.2 - 0.2 14.6 36.2 1.2
Champion Lakes 6.8 22.2 - - - - - - - - - - - 7.6 9.6 3.8 - 3.8 1.2 3.6 0.4 - - 0.2 54.6 0.2 - 14.4 29.4 1.0
Garden Island HSF 5.2 5.2 0.2 - - - - - - - - - - 6.0 11.4 4.8 - 0.6 3.2 1.4 - 0.2 1.2 13.4 26.8 8.2 - 21.2 14.6 3.2
Gosnells City 6.8 37.6 0.2 - - - - - - - - - - 9.6 7.2 »» 6.2 1.4 8.6 1.8 0.4 - 1.0
53.0 0.5 0.2 15.2 27.2 2.1
Jandakot Aero 28.0 27.8 - - 0.2 - - - - - - - - 7.8 16.2 3.0 - 4.6 2.8 5.2 0.2 - - 1.4 54.4 1.2 - 17.8 30.2 2.4
Jarrahdale 9.4 43.4 0.2 0.2 0.4 - 0.2 0.4 - - - - - 8.2 11.2 5.0 0.2 4.6 9.2 4.8 1.2 0.2 - 3.8 51.2 1.6 0.2 22.2 32.8 0.8
Medina Research Centre 9.8 20.7 - - - - - - - - - - - 6.4 12.6 8.6 0.1 1.6 6.0 1.6 0.4 - - 3.2 30.2 5.8 - 18.4 34.0
Mundaring 12.2 37.0
0.2 0.2
0.2 0.2 0.2



10.0 17.2 13.4 0.6 0.4 7.2 4.4 0.6 0.2 0.2 0.4 37.6 0.2
11.2 34.4 1.0
Pearce RAAF 4.0 29.0 - - -
- - - - - - - 4.0 3.4 5.4 - - 5.0 1.0 0.4 - - - 21.8 1.4 - 5.2 31.2 0.6
Perth Airport 8.6 22.4 - - - - - - - - - - - 7.4 9.4 9.0 - 0.4 5.4 1.0 0.2 - - - 36.2 0.4 - 11.4 24.4 1.4
Perth Metro 8.6 30.2 - - - - - - - - - - - 7.4 9.0 8.8 - 0.6 2.8 3.0 - - - 0.6 57.0 - 0.2 14.2 26.8 2.2
Roleystone












10.8 11.2 15.0






1.4 52.8

14.6 31.4 1.6
Rottnest Island 4.4 5.8 - - - - - - - - - - - 3.4 10.6 0.8 - 1.8 2.6 0.2 0.2 - - 7.0 25.2 8.4 - 31.6 13.8 3.0
Serpentine 10.0 17.8 0.2 - - - - - - - - - - 7.6 10.8 5.8 - 1.8 6.4 3.2 1.8 - - 4.0 50.0 0.8 - 17.4 22.8 1.0
Swanbourne 11.4 24.6 - - - - - - - - - - - 8.6 9.6 2.0 - 3.2 4.2 1.2 0.4 - - 0.6 63.8 0.4 - 25.2 27.6 0.4

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 Monthly 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 12 pm on Thursday 30 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

Media
(03) 9669 4057
Enquiries