Greater Perth in July 2019: mild daytime temperatures with a wet start

Rainfall in July 2019 was below average for most sites but near average along the coast and in offshore islands in the Greater Perth region. Daytime and night-time temperatures were above average across Perth.

Below average rain for most sites away from the coast

  • Rainfall was below average for most sites, but near average along the coast and in offshore islands
  • Monthly rainfall totals were in the 70-140 mm range, and there were 10-12 wet days (daily rainfall of 1 mm or more) for most sites
  • Perth Metro recorded 108.6 mm in July, which was below average, and driest July since 2015 (102.4 mm)
  • The wettest day was on the 5th with 30-60 mm rainfall across Perth from a cold front and associated cloudband; Swanbourne had the highest daily rainfall of the month with 64.6 mm
  • Perth Metro and Swanbourne recorded daily rainfall of 44.2 mm and 64.6 mm respectively on the 5th, which was their highest July daily rainfall for 18 years, since 88.8 mm and 75.0 mm were recorded respectively on 30 July 2001
  • Perth Metro recorded 396.2 mm rainfall for year to date (January-July), which was below average (449.2 mm) and driest year to date since 2012 (336.2 mm)

Above average daytime and night-time temperatures

  • Mean maximum and minimum temperatures were above average across Perth
  • For Perth Airport and Pearce RAAF, a mean maximum temperature of 19.3  °C was their warmest July since 2007, when a mean maximum of 19.7  °C (its warmest on record) and 19.3  °C was recorded respectively
  • Perth Metro recorded a mean maximum temperature of 19.3 °C, which was 0.9 °C above average and warmest July since 2012 (19.4 °C)
  • The coldest day was on the 5th across Perth; Bickley recorded the lowest maximum temperature of the month with 10.4  °C
  • Perth Metro recorded a daily maximum temperature of 13.5 °C on the 5th, which was its lowest maximum for any month for eight years (13.0  °C was recorded on 11 July 2011)
  • Perth Metro recorded a mean minimum temperature of 8.4 °C, which was 0.6 °C above average, though cooler than July in 2017 (9.5 °C) and 2018 (10.2 °C)
  • Perth Metro's year to date mean maximum temperature was 25.5 °C, equal the average though cooler than January-July 2018 (25.6 °C)
  • Perth Metro's year to date mean minimum temperature was 13.0 °C, which was 0.4 °C below average and coolest year to date since 2010 (13.0 °C)

Perth Metro

  • Total rainfall for Perth Metro was 108.6 mm, which is 75% of the long-term average of 144.5 mm
  • The warmest day was 23.2 °C on the 30th, and the coolest day was on the 5th when the temperature reached 13.5 °C
  • The coldest morning was 3.3 °C on the 17th, and the warmest morning was on the 22nd when the minimum temperature was 12.5 °C

 

Further information

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Extremes in July 2019
Hottest day 23.2 °C at Perth Airport on the 30th
23.2 °C at Perth Metro on the 30th
Warmest days on average 19.3 °C at Pearce RAAF
19.3 °C at Perth Airport
19.3 °C at Perth Metro
Coolest days on average 15.8 °C at Bickley
Coldest day 10.4 °C at Bickley on the 5th
Coldest night 1.4 °C at Jandakot Aero on the 17th
Coolest nights on average 6.6 °C at Karnet
Warmest nights on average 13.1 °C at Rottnest Island
Warmest night 15.2 °C at Rottnest Island on the 4th
Warmest on average overall 15.7 °C at Rottnest Island
Coolest on average overall 11.4 °C at Karnet
Wettest overall 142.6 mm at Mount Solus
Driest overall 74.2 mm at Werribee
Wettest day 64.6 mm at Swanbourne on the 5th
Strongest wind gust 98 km/h at Rottnest Island on the 19th




Summary statistics for July 2019
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
July
2019
Diff
from
average
Highest for
July
2019
Mean for
July
2019
Diff
from
average
Lowest for
July
2019
Total for
July
2019
Average
for
July
Rank of
July
2019
Fraction of
July
average
Bickley 15.8 +0.7 19.6 30th 7.8 +0.6 4.7 14th 138.4 216.8 low 64%
Garden Island HSF 18.3 +0.5 20.9 3rd 11.4 +0.2 8.4 16th 132.2 116.4 high 114%
Jandakot Aero 18.9 +0.9 22.6 31st 7.5 +0.6 1.4 17th 132.8 173.1 low 77%
Karnet 16.2 +0.7 20.1 30th 6.6 +0.3 3.3 17th   217.1    
Mandurah 18.1 +0.6 20.4 3rd 10.9 +0.2 8.0 14th 111.8 116.9 average 96%
Millendon (Swan Valley) 19.2   22.8 30th 7.8   2.8 17th 94.0
Pearce RAAF 19.3 +1.4 22.7 30th 8.9 +0.5 4.6 16th 91.4 133.8 low 68%
Perth Airport 19.3 +1.4 23.2 30th 8.4 +0.4 4.9 12th 99.6 155.3 low 64%
Perth Metro 19.3 +0.9 23.2 30th 8.4 +0.6 3.3 17th 108.6 144.5 low 75%
Rottnest Island 18.3 +0.5 21.4 3rd 13.1 +0.7 9.7 5th 123.0 113.0 average 109%
Swanbourne 18.7 +0.3 22.2 3rd 10.4 +0.7 7.2 17th 137.8 149.8 average 92%

Daily maximum temperatures for July 2019
12345678910111213141516171819202122232425262728293031
Bickley16.716.717.815.910.413.915.517.214.115.315.615.515.815.316.718.318.916.215.013.515.313.915.517.614.212.717.616.513.119.619.4
Garden Island HSF19.019.120.919.113.617.318.219.717.917.817.517.118.719.019.518.920.219.320.018.018.815.718.419.617.416.217.316.518.518.519.7
Gosnells City22.020.314.517.620.518.018.118.219.622.416.019.121.016.520.619.5
Jandakot Aero19.119.921.519.312.917.018.719.918.017.918.518.118.818.920.120.721.719.819.917.119.717.018.520.116.816.120.218.517.022.122.6
Karnet16.617.819.111.815.016.317.815.015.015.815.816.016.518.018.519.118.316.014.316.513.515.517.013.513.616.315.515.120.1
Mandurah18.518.620.418.614.317.617.018.517.818.118.016.219.118.919.518.619.618.819.217.918.715.918.717.316.416.318.317.219.318.318.9
Millendon (Swan Valley)19.420.621.619.313.818.018.220.317.618.219.119.018.618.919.722.222.020.619.417.419.117.119.120.617.816.120.119.417.622.821.7
Pearce RAAF20.220.622.419.613.316.518.420.318.219.118.518.418.818.819.921.822.320.919.717.918.617.319.220.918.815.919.519.417.822.722.0
Perth Airport19.220.921.819.213.516.819.120.118.218.619.018.819.119.019.921.822.719.819.617.619.117.218.821.218.216.320.619.416.723.222.7
Perth Metro20.220.621.719.113.518.219.220.518.318.118.618.719.119.319.821.922.420.719.417.719.217.419.020.817.015.920.319.017.323.222.9
Rottnest Island19.219.221.415.714.017.418.720.018.318.817.016.418.017.919.719.120.918.919.617.719.016.918.519.216.115.718.716.620.221.0
Swanbourne19.319.622.219.913.217.618.620.018.118.118.218.019.119.320.420.020.919.318.917.618.916.918.519.117.716.119.317.617.419.821.2
Values are the maximum temperature, usually in the 24 hours from 9 am on the day indicated,
and typically occurred in the afternoon of that day.
Temperatures coloured according to 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 Grey outline marks highest
and lowest for the period

Daily minimum temperatures for July 2019
12345678910111213141516171819202122232425262728293031
Bickley9.77.76.78.36.05.47.77.88.410.18.75.87.94.75.36.17.210.711.16.88.88.58.38.09.57.58.67.86.57.27.8
Garden Island HSF14.010.79.914.49.99.012.310.413.314.811.49.110.69.710.78.49.313.213.711.614.014.011.610.512.911.512.011.09.69.910.2
Gosnells City14.59.06.18.210.210.510.29.04.510.510.511.411.510.211.0
Jandakot Aero12.26.74.512.98.46.58.64.99.79.59.24.15.86.76.31.51.47.711.17.811.39.46.34.59.79.910.68.75.56.55.6
Karnet8.05.05.99.83.47.05.16.88.77.04.46.16.16.74.63.37.87.96.08.38.15.95.38.37.58.67.46.16.97.0
Mandurah11.611.610.514.29.09.111.011.112.113.011.48.19.38.09.48.810.012.314.69.913.811.611.210.812.311.311.210.09.610.210.7
Millendon (Swan Valley)12.15.66.114.28.55.38.23.97.08.19.15.18.17.28.63.72.86.28.67.010.810.75.96.39.610.810.98.48.38.07.6
Pearce RAAF11.96.38.014.59.26.08.95.37.69.69.56.08.110.010.54.64.96.48.38.412.311.56.78.010.710.711.39.210.410.59.1
Perth Airport12.15.87.213.18.45.19.06.38.28.79.04.96.77.59.17.65.47.810.77.610.710.85.96.710.110.711.49.68.98.16.6
Perth Metro11.96.06.112.08.96.89.85.58.89.710.64.46.75.86.43.83.38.612.08.811.812.57.47.111.010.811.410.27.37.76.7
Rottnest Island13.813.513.715.29.710.113.114.313.314.413.511.812.311.812.613.113.315.015.110.713.613.913.913.613.412.512.812.711.714.4
Swanbourne11.79.310.013.49.08.010.48.711.512.812.47.88.98.78.78.57.210.713.511.413.313.79.79.312.411.011.610.19.19.210.7
Values are the minimum temperature, usually in the 24 hours to 9 am on the day indicated,
and typically occurred that morning.
Temperatures coloured according to 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 Grey outline marks highest
and lowest for the period

Daily rainfall for July 2019
12345678910111213141516171819202122232425262728293031
Anketell 25.0 - - - 53.4 7.0 3.8 - 0.6 0.4 1.0 - - - - - - 1.4 10.0 17.0 1.0 3.2 - - 0.2 - 4.4 0.4 - - -
Bickley 9.0 0.2 0.2 - 51.6 3.8 1.8 0.2 - 1.2 - 0.4 - 0.2 - 0.2 - 0.6 6.0 38.8 5.8 9.4 0.2 - 1.2 - 5.8 1.2 0.2 0.4 -
Bungendore 11.6 0.4 0.2 - 54.0 2.4 8.2 0.2 0.2 0.2 0.2 0.2 0.2 - - - 0.2 1.4 15.4 24.4 3.0 7.4 0.2 0.2 0.2 - 2.4 - 0.2 0.2 -
Chidlow 7.0 - - - 38.8 1.4 0.9 0.1 - - - - - - - - - 3.6 23.6 10.2 - 0.3 0.1 - 0.9



Garden Island HSF 4.8 - - - 52.2 11.8 5.4 0.2 1.2 0.2 0.2 0.2 - - - - - 4.6 12.4 26.4 1.6 2.6 - - 1.2 - 6.2 1.0 - - -
Gidgegannup 11.0 0.2 0.4 - 42.8 1.8 1.2 0.2 0.2 0.2 - 0.2 0.2 - - - - - 5.2 25.2 9.2 11.8 - 0.2 0.2 - 0.6 0.2 0.2 0.2 -
Gosnells City - - - - 55.7 9.6 1.2 0.2 - 0.1 29.0 2.6 2.9 0.6 4.4 0.2 -

Huntly 16.2 4.0 2.0 - 35.6 2.0 5.0 0.5 3.8 1.8 2.0 0.2 - - - - - 2.0 8.8 32.4 9.0 11.0 0.2 - 20.0 - - - - 1.0 -
Jandakot Aero 16.2 - - - 46.6 14.6 4.8 - 0.6 0.4 0.2 - - - - - - 1.6 15.6 22.8 2.2 2.6 - - 1.8 - 2.6 - - 0.2 -
Jarrahdale 18.8 0.2 0.2 0.4 42.6 1.4 2.2 - 0.2 0.8 0.2 0.2 0.4 - - - 0.4 6.0 11.4 27.6 5.2 10.4 0.2 - 0.8 0.2 1.2 0.2 0.4 0.2 0.2
Karnet 10.6 1.2 - - 0.5 3.2 0.6 0.5 5.0 0.6 0.3 - - 0.3 0.2 0.2 2.6 8.6 23.8 10.6 0.4 - 0.8 - 1.9 0.4 0.3 - 0.3
Karragullen North 8.8 - - - 44.8 4.4 6.2 - 0.4 - - - - - - - - 2.0 8.6 29.6 8.0 6.8 - - 1.2 - 3.0 0.8


Maida Vale 4.2 - - - 44.8 6.4 2.0 - - 1.4 - - - - - - - 4.0 4.2 21.0 4.6 4.6 0.2 - 2.4 - 7.4 0.2


Mandurah 14.4 - - - 53.0 12.2 1.4 2.2 1.0 1.0 0.8 0.2 - - - - - 4.8 2.6 8.0 1.0 2.2 - 0.2 1.8 - 5.0 - - - -
Midland 12.0 1.0 - - - 55.0 0.5 - - - - - - - - - - 27.5








Millendon (Swan Valley) 8.6 - - - 45.6 5.4 0.6 - 0.4 0.2 - - - - -
- - 2.6 18.2 6.2 4.4 0.4 - 0.2 - 1.2 - - - -
Mount Solus 14.0 0.2 0.4 - 37.2 0.8 3.0 - 0.2 1.4 3.0 0.4 0.4 - - - - 3.2 11.0 42.4 7.2 11.8 0.4 0.4 0.6 0.2 3.6 0.2 0.2 0.4 -
Muchea 4.6 0.2 0.2 - 44.0 7.8 1.6 0.2 1.0 0.4 - 0.2 - - - - - - 3.0 10.2 6.2 2.6 0.2 - 0.6 0.2 - 0.2 - - -
Mundaring 9.4 - 0.2 - 44.0 2.8 3.0 0.2 - 0.4 - - - - - - - 0.2 2.8 29.6 6.4 9.4 - - 0.8 - 4.6 1.4


Pearce RAAF 6.0 0.2 - - 53.2 5.8 1.6 0.2 2.0

- - - - - - - 4.2 11.4 2.4 3.6 - 0.2 - - 0.2 0.2 0.2 - -
Perth Airport 5.8 - - - 41.0 5.2 2.8 - 0.6 - - - - - - - - 0.4 1.8 22.4 4.0 4.8 0.2 - 1.0 0.2 9.2 0.2 - - -
Perth Metro 9.4 0.2 - - 44.2 11.2 1.6 - - 0.2 - - - - - - - 0.8 5.0 13.2 5.8 3.6 0.2 - 2.6 - 10.4 0.2 - - -
Pinjarra South 11.8 - - 0.2 44.6 4.6 4.6 - 3.8 1.0 1.0 - - - - - - 0.4 13.8 17.8 3.4 5.4 - - 0.8 - 2.4 - - - -
Roleystone 9.0 - - - 50.0 7.0 7.4 - - 1.0 - - - - - - - 1.4 7.6 26.4 5.0 6.2 - - - - 3.0



Rottnest Island 5.2 0.6 - 0.2 46.6 13.4 7.0 0.2 4.0 0.2 2.2 - - - - - - 4.2 13.6 12.4 2.4 2.2 0.2 - 1.8 - 6.4 0.2 -
-
Serpentine 12.4 - - - 43.0 1.4 2.2 0.2 - 0.4 - - - - - - - 6.4 8.2 21.8 3.0 7.2 - - 1.2 0.2 0.6 - 0.2 - -
Subiaco Treatment Plant 7.0 0.2 - - 53.0 14.8 7.6 - - - - - - - - - - 2.0 8.4 12.4 5.0 3.0 0.8 0.4 6.6 - 7.4 - -

Swanbourne 6.8 0.2 - - 64.6 15.0 8.2 - 0.6 0.2 - 0.2 - - - - - 1.2 6.0 15.2 2.6 3.0 1.0 0.4 4.8 - 7.8 - - - -
Tamala Park (Mindarie) 14.4 - - - 52.1 5.0 8.0 2.0 5.9 0.1 0.3 - 0.2 - - - - - 5.6 9.0 2.0 1.4 - - 0.3 0.2 1.2 0.6 - - -
Wanneroo 12.6 - - - 52.0 15.4 1.0 0.2 0.1 - - - - - - 4.8 17.4 - 2.6 0.1




Werribee 7.4 0.2 - 0.2 32.2 0.6 0.8 - 0.2 - - - 0.4 - - - - 0.2 2.0 15.4 8.2 4.8 0.2 0.2 0.4 - 0.4 - - 0.4 -
Whiteman Park 12.2 - - - 49.4 1.2 10.8 0.2 - 0.4 - - - - - - - - - 16.4 5.2 5.0 - - 1.4 - 2.4 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 shown 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).
Rainfalls coloured
according to the amount
0 1.0 5.0 10.0 15.0 25.0 50.0 100 150 200 300 400 600 millimetres

Notes

The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater Perth using the most timely and accurate information available on the date of publication; it will generally not be updated. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

This summary includes data from observing sites in or near the Greater Perth “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.

This statement has been prepared based on information available at 9 am on Thursday 1 August 2019. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

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 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.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Further information

Media
(03) 9669 4057
Enquiries