Perth in October 2014: Warm days and mild nights

Rainfall in the Perth metropolitan area was near average to below average during October 2014. Monthly rainfall totals ranged from 15 mm to 40 mm for most sites, whilst Swanbourne was the wettest location in the Perth area with a monthly total of 70.0 mm, largely the result of moderate daily falls on the 6th and 19th.

Across the Perth metropolitan area, mean daily maximum temperatures were mostly 1 °C to 2 °C above the long-term average. Perth Metro recorded a mean maximum temperature of 24.5 °C, which is the equal fourth warmest October in 118 years of record, equal with October 2011, but behind 25.8 °C in October 1969, 25.0 °C in October 2012 and 24.6 °C in October 2010. Temperatures in the low to mid-thirties were observed on the coastal plain on the 14th, 15th and 22nd, with the 15th being the warmest day across all sites and a daily maximum of 37.2 °C at Gosnells City being the highest temperature of the month in the Perth area. Cool days with temperatures in the mid- to high- teens were observed on the 5th, 6th and 19th.

Mean minimum temperatures were generally about 1 °C above average across the Perth region in October. Nights at the start, and much of the second half, of the month were cool to mild with minima commonly in the mid-to-high teens. Cold nights with minima below 10 °C were mostly experienced in the first half of the month, and the coldlest night was the 7th for most sites, with a minimum of 4.3 °C at Jandakot Aerodrome on the 7th being the lowest temperature of the month in the Perth area. Perth Metro recorded a mean minimum temperature of 12.4 °C, which is the third highest October mean minimum temperature at the current Mount Lawley site in 21 years of record, behind 13.0 °C in October 2011 and 12.5 °C in October 2012. Rottnest Island recorded a mean minimum of 15.2 °C, its equal warmest October in terms of minimum temperatures in 115 years of record, equal with 1914 and 1976.

  • A severe thunderstorm tracked over the Perth metropolitan area during the afternoon on the 18th, producing heavy rainfall and large amounts of small hail.
  • A surface trough produced moderate rainfall in the southern suburbs on the 22nd.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in October 2014
Hottest day 37.2 °C at Gosnells City on the 15th
Warmest days on average 25.5 °C at Gosnells City
Coolest days on average 21.6 °C at Garden Island HSF
22.1 °C at Bickley
Coldest day 15.1 °C at Bickley on the 5th
15.1 °C at Bickley on the 19th
Coldest night 4.3 °C at Jandakot Aero on the 7th
Coolest nights on average 10.5 °C at Pearce RAAF
Warmest nights on average 15.2 °C at Rottnest Island
13.5 °C at Swanbourne
Warmest night 19.9 °C at Rottnest Island on the 2nd
18.8 °C at Swanbourne on the 2nd
Warmest on average overall 19.2 °C at Gosnells City
Coolest on average overall 16.5 °C at Bickley
Wettest overall 72.6 mm at Jarrahdale
Driest overall 15.6 mm at Rottnest Island
16.4 mm at Pearce RAAF
Wettest day 32.6 mm at Swanbourne on the 19th
Strongest wind gust 81 km/h at Rottnest Island on the 5th

Record highest October mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Rottnest Island 15.2 =15.2 in 1976,1914 115 13.9



Record highest October mean temperature
New record
(°C)
Old
record
Years of
record
Average for
October
Bickley 16.5 16.4 in 2012 20 15.3



Summary statistics for October 2014
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
October
2014
Diff
from
average
Highest for
October
2014
Mean for
October
2014
Diff
from
average
Lowest for
October
2014
Total for
October
2014
Average
for
October
Rank of
October
2014
Fraction of
October
average
Bickley 22.1 +1.0 32.9 15th 10.8 +1.2 6.3 13th 37.8 65.6 low 58%
Garden Island HSF 21.6 +0.7 30.4 22nd 14.5 +1.0 9.9 7th 24.8 29.9 low 83%
Gosnells City 25.5 +1.5 37.2 15th 12.9 +1.2 6.5 7th 39.4 46.0 average 86%
Jandakot Aero 24.6 +1.9 36.6 15th 10.8 +1.2 4.3 7th 29.4 46.0 low 64%
Medina Research Centre 24.4 +1.7 34.8 15th         41.3 40.1 average 103%
Pearce RAAF 25.2 +1.8 34.5 15th 10.5 +0.4 4.6 7th 16.4 36.1 low 45%
Perth Airport 24.9 +2.3 35.8 15th 11.4 +1.2 5.1 7th 33.2 44.0 average 75%
Perth Metro 24.5 +1.3 35.4 15th 12.5 +1.1 5.8 7th 37.0 51.9 average 71%
Rottnest Island 21.8 +1.4 27.5 15th 15.2 +1.3 11.6 5th 15.6 37.4 low 42%
Swanbourne 23.9 +1.7 32.6 15th 13.5 +1.3 8.2 7th 70.4 43.5 high 162%

Daily maximum temperatures for October 2014
12345678910111213141516171819202122232425262728293031
Bickley24.822.719.622.615.116.620.819.518.721.218.819.223.928.432.926.322.821.215.118.023.829.920.324.018.619.524.527.228.719.5
Garden Island HSF28.423.020.821.718.617.018.120.718.718.418.920.722.626.426.024.521.023.017.419.724.130.421.421.822.319.919.921.621.020.122.1
Gosnells City29.526.024.026.620.019.823.823.021.824.022.022.526.832.837.229.225.824.619.022.026.534.023.823.222.526.430.831.021.725.3
Jandakot Aero29.724.622.224.619.519.021.421.521.422.121.422.025.830.836.628.324.824.418.921.725.633.123.225.822.922.724.928.728.322.124.2
Medina Research Centre29.025.922.624.819.718.621.122.820.422.021.022.025.430.334.827.624.023.820.727.333.222.424.122.721.423.629.426.121.3
Pearce RAAF28.825.622.724.818.519.123.722.221.823.721.121.426.430.034.529.125.523.619.422.026.433.624.227.523.523.627.630.830.123.624.9
Perth Airport29.125.222.425.719.519.522.821.722.023.421.321.926.730.835.828.125.224.118.721.225.733.122.726.422.223.225.530.529.122.224.7
Perth Metro28.924.722.425.419.719.422.221.720.822.321.021.825.830.935.427.824.625.219.321.125.131.923.426.022.322.324.729.927.922.223.8
Rottnest Island27.123.021.723.118.817.118.520.919.619.419.920.021.225.427.523.421.222.418.120.722.527.322.722.422.321.820.322.222.121.520.7
Swanbourne29.524.222.423.619.619.420.522.121.321.521.922.925.831.232.625.023.224.419.521.225.131.923.123.423.123.022.728.224.022.422.7
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 October 2014
12345678910111213141516171819202122232425262728293031
Bickley10.814.49.711.511.96.86.48.711.88.68.99.56.311.014.513.312.812.210.68.99.112.812.310.612.111.09.011.015.511.411.5
Garden Island HSF14.219.213.714.114.611.49.911.416.513.312.713.310.912.716.215.717.615.814.413.111.715.716.813.817.916.712.814.417.716.115.0
Gosnells City15.518.511.911.513.19.56.58.714.59.59.711.410.012.616.418.015.516.014.411.08.516.514.512.813.711.015.017.013.69.6
Jandakot Aero9.915.77.88.410.27.24.35.014.69.16.09.89.08.08.515.812.215.413.68.85.913.813.79.311.115.79.712.316.712.614.1
Medina Research Centre13.016.89.09.510.78.85.46.515.010.07.010.09.37.39.215.012.712.212.813.816.312.314.1
Pearce RAAF13.516.89.57.610.08.34.65.411.56.46.17.99.98.111.315.510.814.913.87.55.515.212.58.910.112.16.812.715.814.413.4
Perth Airport12.717.39.18.810.88.65.16.313.48.17.38.710.29.011.516.713.715.414.49.77.013.913.510.411.613.38.913.516.914.314.7
Perth Metro11.616.411.110.813.010.85.87.715.411.19.711.410.29.810.816.214.316.013.810.38.215.014.312.613.416.210.113.417.814.914.9
Rottnest Island15.519.915.715.711.612.012.314.015.514.614.713.612.015.617.617.016.716.513.913.014.216.416.515.116.816.513.616.017.516.415.1
Swanbourne14.118.812.513.514.410.68.210.315.310.811.411.710.412.514.017.715.415.413.811.410.415.015.213.015.016.710.813.117.116.312.8
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 October 2014
12345678910111213141516171819202122232425262728293031
Bickley - 0.8 - 0.2 7.4 12.6 - - 2.8 - 0.2 - - - - - - 1.2 2.8 2.8 0.2 - 1.6 - 0.2 2.2 0.2 - - 1.8 0.8
Garden Island HSF - - - - 5.0 3.2 - - 1.2 - - - - - - - - 0.4 1.2 9.8 - - 3.0 0.2 - - - - - - 0.8
Gosnells City - - - 11.0 - - 2.0 - - - - - - - - 1.0 2.8 4.0 - - 3.0 0.6 - 1.2 - - - 7.0
Jandakot Aero - 0.2 - - 5.6 5.4 - - 0.4 - - - - - - - - 1.6 7.8 5.2 - - 1.2 0.6 - 1.4 - - - - -
Jarrahdale - 0.4 0.2 0.4 11.6 14.2 - 0.2 3.4 0.4 - 0.2 - 0.2 - - - 2.0 7.2 1.2 0.2 - 24.4 0.8 0.2 2.6 1.0 - - 0.2 1.6
Medina Research Centre - - - - 7.6 2.0 - - 1.0 - - - - - - - - 2.0 1.8 12.0 - - 12.6 - - 1.3 - - - - 1.0
Mundaring - 1.4 - - 8.8 10.8 - - 3.2 0.1 - - - - - - - 2.2 0.4 8.0 - - 1.2 0.2 - 1.2 - - - - 0.4
Pearce RAAF - 0.8 - - 6.4
- - 1.4 - - - - - - - - 1.2 1.6 0.8 - - 2.0 - - 1.8 0.2 - - - 0.2
Perth Airport - - - - 5.6 5.4 - - 4.6 - - - - - - - - 1.2 8.2 3.2 - - 2.2 0.2 - 0.4 0.6 - - 0.6 1.0
Perth Metro - - - - 4.2 8.8 - - 5.0 - - - - - - - - 0.6 12.0 3.0 - - 2.2 - - 0.2 0.6 - - - 0.4
Roleystone - - - - - - - - 2.1 - - - - - - - - 2.4 11.8 3.2 - - 0.8 0.6 - 1.2 - - - - 1.0
Rottnest Island - - - - 2.2 5.2 - - 2.2 - - - - - - - - - 1.2 4.2 - - 0.2 - - - - - - - 0.4
Serpentine 0.2 - - 0.6 9.8 7.0 0.2 - 3.4 - - - - - - - - 1.0 6.2 3.0 0.2 - 17.0 - 0.2 0.2 2.6 - - - 1.8
Swanbourne - - - 0.4 5.4 12.0 - - 2.8 - - - - - - - - 1.6 32.6 7.4 - - 4.6 - - - 0.2 - - - 3.4
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

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 9 am on Monday 3 November 2014. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

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.

The ACORN-SAT dataset is used for temperature area averages.

Further information

Media
(03) 9669 4057
Enquiries