Perth in July 2014: A near average month, but above average rain days

Rainfall totals were near average for most sites in the Perth Metropolitan area in July 2014, ranging from just over 100 mm in the northeastern suburbs, between 130 mm and 180 mm for most island and coastal plain sites, to over 220 mm in the hills; however, it was a wet month in terms of rain days as most sites recorded twenty or more for the month. Mean daily maximum temperatures were near average across the Perth area. Most days were cool with daily maxima in the 15 to 19 °C range, whilst warmer days with daily maxima in the low twenties occurred on the 1st, 5th, and 19th. Mean minimum temperatures were near average for most sites, though Perth Metro, Jandakot Aerodrome, and Medina Research Centre saw mean minima 1 °C or more above above average. The first two nights of July 2014 were cool to mild with daily minima in the mid-teens followed by two very cold nights with daily minima commonly below 5 °C. More very cold nights were recorded in the middle of the month, on the 9th and 10th, 13th, and 17th, whilst cool to mild nights with minima in low to mid-teens were recorded from the 5th to 7th, and from the 26th to 30th.

  • A strong cold front produced heavy showers, thunderstorms and squally winds in the Perth area with tornadoes reported in the suburbs of Hilton/O'Connor, Claremont/Nedlands, and Beeliar on the 14th. Tragically, two men died when their respirators failed during a power outage.
  • A moderate cold front brought moderate to heavy rainfall to the Perth area on the 21st and 22nd with most sites recording daily totals over 25 mm on the 22nd. Swanbourne registered 46.6 mm, the highest daily fall in Perth during July 2014, and Swanbourne's wettest day for fourteen months, since 8 May 2013 when 56.8 mm was recorded, its wettest July day for 13 years, since 30 July 2001 when 75.0 mm was recorded, and its 5th highest daily rainfall in July in 21 years of record.
  • Partly as a result of the wet day on the 22nd, Swanbourne recorded its wettest July for 19 years with a rainfall total of 207.6 mm; wetter than any previous July since1995 when a July rainfall total of 240.0 mm was recorded.
  • Warm northerly winds combined with cloudy conditions resulted in a mild night across the Perth metropolitan area on the evening of the 1st and morning of the 2nd, with a number of sites recording their highest minimum temperature on record for July . A minimum of 16.5 °C at Perth Metro was the highest minimum temperature in July at the site since records commenced in 1897. The previous record was 16.1 °C in 12 July 1898. Similar conditions overnight on the 29th/30th saw Swanbourne break its highest minimum temperature record with a minimum of 15.8 °C on the 30th, after equalling its previous record during the event on the 2nd. The previous record wa

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Extremes in July 2014
Hottest day 23.1 °C at Gosnells City on the 5th
Warmest days on average 18.9 °C at Gosnells City
Coolest days on average 15.0 °C at Bickley
Coldest day 11.8 °C at Bickley on the 22nd
Coldest night 0.2 °C at Jandakot Aero on the 4th
Coolest nights on average 7.7 °C at Bickley
Warmest nights on average 12.6 °C at Rottnest Island
10.5 °C at Swanbourne
Warmest night 16.8 °C at Rottnest Island on the 6th
16.5 °C at Perth Metro on the 2nd
Warmest on average overall 15.3 °C at Rottnest Island
14.6 °C at Swanbourne
Coolest on average overall 11.3 °C at Bickley
Wettest overall 228.0 mm at Jarrahdale
Wettest day 46.6 mm at Swanbourne on the 22nd
Highest wind gust 106 km/h at Rottnest Island on the 7th

Highest total July rainfall for at least 10 years
Total rainfall
for July 2014 (mm)
Most recent July
at least this wet
Years since
wetter
Average for
July
Swanbourne 209.0 240.0 in 1995 19 149.5



Record highest July daily minimum temperature
Highest daily minimum
temperature
in July 2014 (°C)
Previous warmest
for July
Years of
record
Average for
July
Perth Metro 16.5 on the 2nd 16.1 on the 12th in 1898 115 7.7
Perth Airport 16.2 on the 2nd 15.7 on the 30th in 2001 71 8.0
Jandakot Aero 15.5 on the 2nd 15.1 on the 31st in 2011 24 6.7
Gosnells City 16.0 on the 2nd 15.5 on the 18th in 2002 22 8.7
Bickley 14.0 on the 2nd 13.2 on the 3rd in 1994 20 7.1
Swanbourne 15.8 on the 30th 15.6 on the 9th in 2006 20 9.6



Summary statistics for July 2014
Maximum temperatures
for July
(°C)
Minimum temperatures
for July
(°C)
Rainfall
for July
(millimetres)
Mean for
July
2014
Diff
from
average
Highest for
July
2014
Mean for
July
2014
Diff
from
average
Lowest for
July
2014
Total for
July
2014
Average
for
July
Rank of
July
2014
Fraction of
July
average
Central Coast (district 09)
Bickley 15.0 -0.1 19.1 5th 7.7 +0.6 3.2 3rd 225.8 217.3 average 104%
Garden Island HSF 17.9 +0.1 21.5 1st 11.9 +0.9 8.2 9th 131.0 116.1 high 113%
Gosnells City 18.9 +0.3 23.1 5th 9.2 +0.5 3.5 10th 173.0 162.2 average 107%
Jandakot Aero 18.2 +0.3 22.2 5th 7.9 +1.2 0.2 4th 186.2 174.6 average 107%
Medina Research Centre 18.4 +0.1 22.7 5th 9.4 +1.2 2.1 10th 139.4 147.2 average 95%
Pearce RAAF 18.3 +0.5 22.9 1st 8.6 +0.2 2.3 3rd 105.2 134.4 low 78%
Perth Airport 18.4 +0.5 22.6 1st 8.5 +0.5 2.3 3rd 135.6 156.5 average 87%
Perth Metro 18.5 +0.1 23.0 1st 9.0 +1.4 2.8 10th 151.2 168.5 average 90%
Rottnest Island 18.0 +0.3 21.5 1st 12.6 +0.3 10.1 22nd
Swanbourne 18.8 +0.5 22.9 1st 10.5 +0.9 4.8 10th 209.0 149.5 v high 140%

Daily maximum temperature for July 2014
Central Coast (09)12345678910111213141516171819202122232425262728293031
Bickley19.015.312.317.019.116.012.912.412.214.715.915.015.914.415.614.214.116.816.914.913.411.812.215.916.014.315.216.615.715.113.1
Champion Lakes22.118.515.319.621.217.017.515.015.417.519.317.518.217.018.216.216.619.420.016.515.714.814.7
Garden Island HSF21.518.815.619.220.918.018.116.016.515.717.017.818.717.318.316.217.319.419.216.317.416.217.518.119.418.618.618.818.818.315.1
Gosnells City23.020.016.021.223.122.017.815.516.018.520.019.420.018.419.517.317.021.121.718.516.515.516.519.019.817.720.020.020.519.016.8
Jandakot Aero22.019.615.520.622.218.418.216.216.017.018.717.918.917.618.716.617.319.720.517.216.314.815.518.418.718.618.919.619.418.416.0
Medina Research Centre22.018.816.119.922.717.117.915.817.017.019.019.020.117.718.617.117.420.020.017.116.414.616.318.419.318.519.020.019.818.7
Pearce RAAF22.919.515.220.422.320.718.515.815.717.217.917.018.817.819.017.416.719.820.817.517.315.116.018.420.118.819.019.219.018.615.6
Perth Airport22.619.315.720.722.419.617.516.515.717.719.117.819.517.818.917.117.319.820.817.517.515.315.619.219.617.618.219.119.418.816.3
Perth Metro23.019.515.721.122.819.718.116.316.217.819.317.819.318.118.917.017.019.720.117.216.616.115.818.919.517.919.019.319.818.716.7
Rottnest Island21.518.615.519.321.218.118.616.616.115.817.417.218.917.818.716.116.819.519.716.918.116.217.018.120.019.418.919.218.918.514.0
Swanbourne22.919.016.620.622.618.718.517.117.517.219.519.019.818.419.118.117.921.021.117.117.115.816.618.918.518.619.519.820.019.317.2

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 for July 2014
Central Coast (09)12345678910111213141516171819202122232425262728293031
Bickley11.114.03.23.28.312.68.76.44.84.36.26.84.37.58.37.85.24.75.68.48.36.25.68.19.911.29.310.110.111.86.1
Champion Lakes14.815.84.56.111.815.010.49.94.65.27.79.98.38.39.49.45.87.89.910.38.49.47.59.8
Garden Island HSF15.014.68.58.911.815.113.111.38.28.310.99.810.012.613.812.39.710.011.310.99.59.910.011.413.815.314.614.015.216.311.6
Gosnells City14.416.04.05.012.214.410.510.03.73.57.19.57.26.59.08.54.09.48.45.18.29.58.010.012.513.49.010.012.015.08.8
Jandakot Aero13.515.51.60.210.014.511.89.81.40.66.06.31.58.08.16.92.53.23.18.06.78.57.68.012.113.49.913.410.715.46.3
Medina Research Centre13.13.411.714.012.510.42.72.17.27.54.57.512.89.05.06.57.58.57.99.08.610.811.713.913.213.613.915.08.2
Pearce RAAF13.515.92.34.19.013.78.79.62.43.58.29.14.86.66.78.42.67.78.98.88.19.27.710.010.913.28.711.310.313.68.4
Perth Airport12.316.22.34.310.514.710.89.72.62.68.49.36.86.47.68.92.76.99.19.37.08.87.69.010.912.67.39.110.313.86.9
Perth Metro13.716.53.03.08.914.711.710.73.42.88.18.33.98.110.110.32.85.35.48.78.78.89.08.611.013.511.713.810.614.87.7
Rottnest Island15.715.110.511.214.916.812.310.311.410.211.510.311.312.512.213.210.912.012.911.812.410.110.511.514.515.313.813.815.215.312.0
Swanbourne14.615.65.46.110.014.812.29.96.14.89.08.87.311.413.311.35.28.08.89.411.28.29.010.712.414.114.014.313.915.88.4

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 for July 2014
Central Coast (09)12345678910111213141516171819202122232425262728293031
Bickley - 13.2 15.2 0.2 12.4 2.2 34.6 36.8 0.6 0.2 - 0.2 0.2 19.0 5.4 1.4 - 0.2 - 5.4 2.4 27.4 6.4 2.8 3.6 4.6 25.0 1.2 1.6 - 3.6
Champion Lakes - 17.6 6.6 - 8.0 1.0 34.6 15.6 0.4 - 0.2 - - 15.2 3.2 0.8 - - - 13.6 0.4 25.8 4.8 4.4






Garden Island HSF 0.4 20.2 2.2 - 6.2 10.8 10.6 8.8 1.2 - - - - 8.0 2.8 0.2 - - - 1.2 3.4 25.4 5.6 2.0 0.2 11.4 7.6 0.6 1.0 - 1.2
Gosnells City - 12.0 5.2 - 9.6 1.4 24.0 17.0 2.0 - - - - 14.0 4.0 1.0 - - »» »» 2.4 32.0 3.0 4.0 1.4 »» »» 13.8 0.6 - 1.8
Jandakot Aero - 34.0 7.0 - 13.4 3.6 17.4 11.6 0.6 - - - - 17.4 2.8 1.2 - - - 2.2 1.4 30.8 5.6 7.8 2.0 11.4 8.8 5.8 - - 1.4
Jarrahdale 0.2 20.4 14.8 0.2 8.2 7.0 30.6 17.4 0.8 0.2 - 0.2 0.2 16.2 6.0 1.8 - 0.2 - 16.0 1.6 43.8 1.2 4.4 0.8 11.2 13.0 5.0 4.6 - 2.0
Medina Research Centre »» 15.3 3.4 - 6.4 8.4 10.0 7.8 0.8 - - 0.1 - 10.6 2.2 2.0 0.2 - - 5.0 3.6 27.6 6.8 4.2 1.0 11.4 6.6 0.8 4.4 - 0.8
Mundaring - - - - - - - - - - - - - 19.0 7.4 4.2 - - - 5.0 1.6 25.6 3.6 4.6 1.4 3.2 19.0 3.6 2.6 0.2 2.2
Pearce RAAF - 3.6 15.4 - 0.4 - 15.2 10.8 0.2 - - - - 10.6 3.0 1.8 - - - 4.8 1.6 24.0 2.0 0.6 0.4 0.2 7.8 0.8 1.4 0.4 0.2
Perth Airport - 12.0 6.6 0.2 2.8 0.6 16.6 19.4 0.8 - - - - 14.2 5.8 1.6 - - - 2.6 0.8 26.8 4.2 2.8 1.0 2.8 9.6 2.8 1.0 - 0.6
Perth Metro - 11.2 7.4 - 8.4 1.2 17.6 16.6 1.6 - - 0.6 - 15.4 2.2 1.8 - - - 6.0 3.4 26.6 5.6 3.2 1.4 4.2 14.0 0.8 0.4 - 1.6
Roleystone 0.2 8.0 12.0 - 9.2 1.0 34.2 21.6 - - - - - 18.0 6.0 2.0 - - - 8.9 1.0 38.0 2.2 4.2 3.6 7.2 25.8 5.2 1.0 - 2.0
Rottnest Island 0.8
1.4 - 9.8 1.2

1.0 - - - - 12.0 2.8 0.4 - - - 7.4 0.4 15.8 4.4 0.8 1.2 3.4 4.8 0.6 - - 0.6
Serpentine 0.2 12.6 10.0 - 6.8 4.8 11.0 9.6 2.6 0.2 0.2 - - 13.2 4.2 1.6 - - - 7.6 0.8 21.8 2.4 4.4 0.8 12.6 10.8 2.4 1.4 - 1.0
Swanbourne - 16.4 4.4 - 20.8 3.4 16.8 15.6 3.0 0.2 - - - 15.2 1.4 0.8 - - - 8.8 5.8 46.6 15.2 6.8 2.4 8.0 14.4 1.6 - - 1.4

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

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.

A Climate Summary is generally published on the first working day of each month.

This statement has been prepared based on information available at 10 am on Friday 1 August 2014. 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.

Further information

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