Perth in June 2013: One of the driest Junes on record

  • Rainfall: Driest June on record for several sites
  • Maximum temperature: near average for most sites
  • Minimum temperature: near average to below average

Rainfall

Rainfall across the Perth metropolitan area during June 2013 was well below average, and for many sites it was the driest June on record. Monthly rainfall totals ranged from a mere 10 mm in the northern suburbs to 50 mm in southern suburbs due to rain bearing frontal and low pressure systems being particularly weak. Jarradale in the southern surbubs recorded only 46.8 mm for June 2013, which was its driest June in 127 years of rainfall record, overtaking its previous record of 55.9 mm set 120 years ago in June 1893.

Only a handful of rainfall events with light to moderate falls were observed in the Perth Metropolitan area during June 2013. Two weak cold fronts moved through the southwest corner of WA in the first half of the month, the first overnight on the 4th and 5th, and the second on the 8th, producing only light rainfall in the Perth area. A low in the wake of the second front moved along the WA south coast on the 9th producing moderate falls of 10 to 20 mm at some Perth sites, and Jandakot Aerodrome recorded a daily rainfall of 20.0 mm in the 24 hours to 9am on the 10th, which was the highest daily total of the month in the Perth region. A cold front moved through the Southwest Land Division overnight on the 16th and 17th bringing showers with light to moderate rainfall to the Perth area, with isolated thunderstorms observed in southern surbubs. More cold fronts crossed the southwest of WA on the 23rd and early on the 25th bringing further light to moderate rainfall while a westerly onshore flow in the wake of these cold fronts produced light showers on the 26th and 27th.

Perth Metro recorded 44.0 mm of rainfall on 10 rain days during June 2013, which is the second driest June at Perth Metro since records commenced in 1876, only behind 24.6 mm recorded in June 2006. The highest daily rainfall at Perth Metro in June 2013 was 10.0 mm on the 10th. The average rainfall in June for Perth Metro is 175.4 mm, and last June (2012) Perth Metro recorded 140.8 mm on 18 rain days.

Maximum temperature

Mean maximum temperatures in June 2013 were near average for most sites in the Perth metropolitan area, with the exception of Pearce RAAF and Perth Airport that both recorded maximum temperatures approximately 1 ºC above average. Mean maxima ranged in the mid-teens in the hills to the high teens for the coastal plain and the islands.

June days were cool to mild for most of the Perth area, although the Perth hills saw predominantly cool days. June started with a couple of cool days followed by a lengthy spell of mild days from the 3rd to 9th with maxima generally in the low 20s. Cool days returned from the 10th to 11th, and occurred between the 15th and 18th, and on the 26th. The coolest day was the 15th at most sites due to cloudy conditions and the daily maximum temperature of 11.7 °C at Bickley on the 15th was the lowest maximum temperature of the month in the Perth area. A mild spell from the 22nd to 24th saw most sites record their warmest day of the month on the 22nd with daily maxima in the low twenties as a high over southeastern WA directed warm northerly winds over southwest WA. The daily maximum temperature of 23.4 °C on the 22nd at Gosnells City in the southeast surbubs was the highest temperature of the month in the Perth metropolitan area. A mild end to the month saw two pleasantly warm and sunny days on the last two days with daily maxima in the low twenties at most sites.

Perth Metro's mean maximum temperature in June 2013 was 19.9 °C and near the average, but was the warmest June for six years since a mean maximum of 19.9 °C was also recorded in 2007.  The average maximum temperature for Perth Metro in June is 19.3 °C.  The warmest day during June 2013 saw a maximum of 23.0 °C on the 29th, whilst the coolest saw 15.4 °C on the 15th. Last June (2012), Perth Metro recorded a mean maximum temperature of 19.6 °C, whilst the warmest June since records commenced in 1897 saw a mean maximum of 20.6 °C in 1983.

Minimum temperature

Mean minimum temperatures in June 2013 generally ranged from near average in the western surbubs, on the islands and in the hills, to below average in the inland coastal plain suburbs. Mean minima were mostly in the 7 to 9 °C range inland, and in the 10 to 14 ºC range near the coast and on the islands..

For many sites, most nights were cool to cold with a number of very cold nights on the 1st, 16th, 20th, and 30th, with most sites recording their coldest night of the month on the 1st or 16th. The lowest temperature of the month in the Perth metropolitan area was 0.6 °C at Pearce RAAF on the 16th. Cool nights on the 6th, 9th, and 23rd to 25th, saw the highest minimum temperatures of the month in Perth, the highest for the metropolitan area being a mild 17.7 °C at Rottnest Island on the 9th.

Perth Metro's mean daily minimum temperature in June 2013 was near average at 8.0 °C, but was the coolest June in three years since 7.0 °C was recorded in 2010. The average minimum temperature for June is 8.7  °C. The coldest night during June at Perth Metro was 2.6 °C on the 16th, which was the coldest night of the year so far at Perth Metro and the coldest night since last winter when a minimum of 2.5 °C was recorded on 27 July 2012. Perth Metro's highest minimum temperature for June 2013 occurred on the 6th with a minimum of 13.8 °C.

Sunshine

Perth recorded an average daily sunshine of 7.0 hours in June 2013, which was the third sunniest June since records commenced in 1898, and the sunniest since the record was set in 2006 with 7.4 hours per day. In contrast, last June (2012) was a dull month with only 4.4 hours of sunshine per day. The average daily sunshine for June is 5.9 hours.

Further information

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Extremes in June 2013
Hottest day 23.4 °C at Gosnells City on the 22nd
Warmest days on average 20.1 °C at Swanbourne
Coolest days on average 16.6 °C at Bickley
Coldest day 11.7 °C at Bickley on the 15th
Coldest night 0.6 °C at Pearce RAAF on the 16th
Coolest nights on average 6.5 °C at Jandakot Aero
Warmest nights on average 13.6 °C at Rottnest Island
9.8 °C at Swanbourne
Warmest night 17.7 °C at Rottnest Island on the 9th
13.8 °C at Swanbourne on the 25th
13.8 °C at Perth Metro on the 6th
Wettest overall 51.2 mm at Jandakot Aero
Wettest day 21.8 mm at Bedforedale on the 10th
Highest wind gust 78 km/h at Rottnest Island on the 23rd

Record lowest total June rainfall
Total rainfall
for June 2013 (mm)
Previous driest
for June
Years of
record
Average for
June
Jarrahdale 47.2 55.9 in 1893 128 226.4
Perth Airport 22.0 27.8 in 2006 70 160.0
Pearce RAAF 10.2 21.0 in 2001 59 134.2
Gosnells City 19.0 42.0 in 2006 51 171.2
Roleystone 38.0 45.0 in 2001 46 187.6
Bickley 28.8 35.4 in 2001 45 201.7



Summary statistics for June 2013
Maximum temperatures
for June
(°C)
Minimum temperatures
for June
(°C)
Rainfall
for June
(millimetres)
Mean for
June
2013
Diff
from
average
Highest for
June
2013
Mean for
June
2013
Diff
from
average
Lowest for
June
2013
Total for
June
2013
Average
for
June
Rank of
June
2013
Fraction of
June
average
Bickley 16.6 +0.6 19.7 29th 8.1 0.0 4.7 1st 28.8 201.7 lowest 14%
Champion Lakes 19.1   22.5 29th 9.1   4.6 1st 30.2
Garden Island HSF 19.0 0.0 21.6 22nd 11.7 -0.4 8.0 16th 48.6 115.7 v low 42%
Jandakot Aero 19.6 +0.7 22.6 22nd 6.5 -1.0 1.7 20th 51.2 159.5 v low 32%
Medina Research Centre 19.7 +0.4 23.1 22nd 7.5 -1.6 2.4 16th 50.3 145.2 v low 35%
Pearce RAAF 20.0 +1.2 23.3 22nd 7.5 -1.9 0.6 16th 10.2 134.2 lowest 8%
Perth Airport 19.9 +1.0 22.8 30th 7.8 -1.2 1.5 1st 22.0 160.0 lowest 14%
Perth Metro 19.9 +0.6 23.0 29th 8.0 -0.6 2.6 16th 44.0 175.4 2nd lowest 25%
Rottnest Island 19.1 +0.4 21.9 22nd 13.6 +0.3 11.0 1st 33.8 148.9 2nd lowest 23%
Swanbourne 20.1 +0.8 23.0 22nd 9.8 -0.8 5.5 1st 43.2 126.8 v low 34%

Daily maximum temperature
Central Coast (09)123456789101112131415161718192021222324252627282930
Bickley14.414.616.316.216.218.018.518.216.615.815.015.917.716.011.716.215.515.216.317.416.519.417.618.714.815.217.218.019.719.4
Champion Lakes17.216.719.119.818.319.620.819.719.518.318.018.720.219.815.618.516.817.018.419.719.021.620.020.717.717.619.519.922.521.8
Garden Island HSF17.317.320.418.918.419.320.220.421.518.218.419.319.020.116.817.216.517.417.618.419.421.619.620.818.717.519.219.820.821.1
Gosnells City18.018.019.920.519.221.522.521.520.919.020.021.620.116.119.317.921.423.422.219.222.0
Jandakot Aero17.717.520.019.518.819.721.420.520.618.818.319.120.719.416.718.917.517.819.020.119.622.620.521.818.618.019.620.621.922.3
Medina Research Centre15.517.520.020.318.420.121.821.420.918.718.119.421.417.418.817.118.018.720.321.023.119.121.618.518.020.521.322.822.5
Pearce RAAF17.517.820.020.119.520.721.221.520.819.718.720.321.220.214.718.718.118.519.420.020.423.321.022.419.319.519.721.222.622.6
Perth Airport17.917.919.620.319.720.821.520.421.019.318.319.220.819.815.819.018.118.019.819.919.722.821.222.318.318.320.021.022.322.8
Perth Metro18.118.120.020.019.421.021.820.621.019.518.219.320.820.015.418.417.918.119.220.119.622.921.022.018.718.120.021.223.022.9
Rottnest Island16.716.619.919.119.019.320.520.621.518.017.518.919.719.916.517.816.517.117.519.219.921.920.321.318.716.519.020.320.921.7
Swanbourne18.618.120.620.119.520.921.921.220.620.018.819.921.320.516.317.818.918.619.419.920.123.022.122.018.917.420.121.522.322.9

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 minimum temperature
Central Coast (09)123456789101112131415161718192021222324252627282930
Bickley4.78.08.46.29.911.39.89.912.39.45.36.15.06.58.65.08.67.28.26.56.16.310.410.310.66.99.59.19.26.9
Champion Lakes4.68.011.99.410.313.19.28.011.111.69.410.69.411.411.96.19.75.65.66.09.19.010.310.112.57.29.98.07.97.5
Garden Island HSF9.011.612.29.911.314.511.712.215.713.310.011.110.812.810.78.011.79.310.49.711.113.314.815.213.710.212.812.112.69.8
Gosnells City3.07.011.55.910.513.27.26.510.59.512.111.94.05.55.56.49.95.99.86.0
Jandakot Aero2.18.310.93.48.113.04.55.011.16.94.78.86.810.010.12.48.94.33.41.72.62.312.09.210.74.87.56.43.92.1
Medina Research Centre7.79.06.48.511.96.76.613.28.94.69.58.05.62.49.05.04.63.86.07.012.010.211.46.19.38.15.63.9
Pearce RAAF3.58.912.78.59.513.25.63.611.07.79.610.89.812.310.10.66.54.25.71.66.19.910.38.613.52.96.94.33.83.0
Perth Airport1.58.511.18.28.613.06.76.310.98.37.09.78.610.811.22.47.75.33.94.47.98.48.69.811.95.810.07.06.74.4
Perth Metro3.68.210.85.39.013.87.37.011.310.07.110.08.09.89.82.69.17.16.74.75.15.29.810.813.16.09.78.16.03.9
Rottnest Island11.011.912.613.114.714.414.615.917.714.411.212.412.113.111.411.713.712.313.713.412.414.015.515.914.912.813.314.715.014.0
Swanbourne5.59.711.08.410.213.510.19.812.711.08.410.38.410.99.95.99.58.79.37.87.89.713.113.413.87.511.010.19.77.4

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 - 0.4 - - 1.6 0.2 - - 0.6 7.2 0.4 - - - - - 1.6 - 0.2 0.2 0.2 0.2 - 6.0 8.0 1.8 - - 0.2 -
Champion Lakes - - - - 1.6 - - - 0.6 14.0 - - - - - - 6.4 - - - - - - 4.2 2.6 0.6 - 0.2 - -
Garden Island HSF - - - - 3.4 0.8 0.6 - - 8.0 - - - - - - 17.0 - - 0.2 - - - 9.0 4.2 1.6 2.6 0.6 0.4 0.2
Gosnells City 0.1 - - - 3.2 - - 0.5 7.0 8.2 - - - - - - 4.1 - - - - - - »» »» 10.0 0.1 - -
Jandakot Aero - - - - 5.2 0.2 - - 0.8 20.0 0.2 - - - - - 7.6 - - - - - - 14.4 2.4 0.4 - - - -
Jarrahdale - 0.2 - - 2.2 0.4 0.2 0.2 1.8 12.2 0.2 - - - - - 3.0 0.2 0.2 0.2 - 0.2 0.2 12.0 9.2 3.8 0.2 0.2 0.2 0.2
Medina Research Centre - - - - 4.0 0.4 - - 2.2 8.6 - - - - - - 8.8 0.2 0.1 - - »» »» 8.0 11.8 1.2 4.4 0.6 - -
Pearce RAAF 0.2 - - - 0.6 0.4 0.2 - - 1.8 - - - - -
2.4 0.2 - - - - - 0.4 2.2 1.8 - - - -
Perth Airport - - - - 0.4 - 0.2 - 0.4 9.6 0.2 - - - - - 3.4 - - - - - - 2.2 5.0 0.6 - - - -
Perth Metro - - - - 2.6 0.4 0.2 - 0.6 10.0 - - - - - - 10.0 0.2 - - - - - 6.0 9.6 4.4 - - - -
Roleystone - - - - 1.6 0.2 - - 1.6 15.0 - - - - - - 4.2 - - - - - - 7.8 6.0 1.4 - - 0.2
Rottnest Island - - - - 2.8 0.4 1.2 - - 2.2 - - - - - - 6.0 2.4 0.2 - - - 2.0 8.4 3.6 1.4 3.0 0.2 - -
Serpentine - - - - 2.0 - - - 2.0 6.0 - - - - - - 2.6 0.2 - - - - - 10.8 11.4 2.2 - - - -
Swanbourne - - - - 6.8 0.4 0.4 - 0.8 9.2 - - - - - 0.2 11.6 1.0 0.2 0.2 0.2 - - 1.4 7.6 2.2 0.4 0.4 0.2 -

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

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 10 am on Monday 1 July 2013. 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, 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.

The ACORN-SAT dataset is being used for temperature area averages from December 2012 onwards. The major change from earlier datasets is that the ACORN-SAT dataset commences in 1910, rather than 1950, and hence rankings are calculated using a larger set of years.

Further information

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