Perth in February 2012 : Above average rainfall in February

  • Rainfall: Above average for most sites
  • Maximum temperature: Near average for most sites, below average in the hills
  • Minimum temperature: Near average for most sites

Rainfall

Rainfall across the Perth metropolitan area during February 2012 was above average for most sites. Rainfall totals for the month were in the 10 mm to 30 mm range, with the majority of the rainfall recorded in the first few days of February due to the passage of Ex-Tropical Cyclone Iggy across northern parts of the Southwest Land Division (SWLD). The monthly rainfall total of 24.4 mm at Pearce RAAF was its wettest February in 17 years, since 27.6 mm was recorded in 1995.

Tropical Cyclone Iggy located off the west coast of WA moved in a generally southerly direction on the 1st and weakened below cyclone strength early on the 2nd before tracking eastwards through northern parts of the SWLD on the 3rd. A cloudband extending from TC Iggy brought mainly light showers to the Perth area on the evening on the 1st and early morning the 2nd, however, the passage of Ex-TC Iggy brought moderate rainfall late on the 2nd and into the 3rd, with the 26.2 mm at Whiteman Park in the 24 hours to 9am on the 3rd being the highest daily total of the month in the Perth area. After a lengthy dry spell during the middle of the month, a weak cold front produced some light showers in the evening on the 25th, with falls of 1 mm or less registered at a number of metropolitan Perth sites.

Perth Metro observed 23.6 mm on 3 rain days in February 2012, which was above the long-term average of 12.6 mm, and the wettest February for four years, since 47.6 mm was recorded in 2008. Last February (2011), Perth Metro recorded 0.4 mm on 1 rain day.

Maximum temperature

Most sites in the Perth metropolitan area saw near average mean maxima during February 2012, although Bickley, in the hills, registered a mean maximum temperature of 28.9 °C, which is 1.7 °C cooler than normal, and its coolest February since 1994. Pearce RAAF was the warmest location in the Perth area during February 2012, despite observing its coolest February since 2002.

A number of hot days were experienced during February 2012, with the month beginning with a hot day (35 °C or higher) across the Perth area, the tail end of a hot spell that extended back to 24 January. Many inland sites experienced a heatwave (three or more consecutive days with maximum temperatures of 35 °C or higher) between the 8th and 10th, with the hottest day of the month for most sites coming on the 10th when temperatures reached 40 °C at a majority of coastal plain sites. A second heatwave was also experienced at most inland coastal plain sites between the 20th and 22nd. Much cooler than normal days were experienced in the early part of the month between the 3rd and 5th, and again in the latter part of the month between the 24th and 27th, with daily maxima mostly 5 °C to 8 °C cooler than normal during these periods.

Perth Metro's mean daily maximum temperature in February 2012 was 31.1 °C, which was near average. Daily maxima in February 2012 ranged from a mild 25.1 °C on the 3rd and the 25th, to a very hot 40.1 °C on the 10th. Last February (2011), the mean daily minimum temperature was 34.2 °C, which was the 3rd hottest on record since a mean of 34.6°C was recorded in 1996.

Minimum temperature

Most sites in the Perth region saw near average mean minima during February 2012 apart from Medina Research Centre, which was 1.2 °C above normal.

The month started with three consecutive warm nights (when the daily minimum temperature is 20 °C or higher) for most sites, and warm nights were also experienced at most sites from the 9th to 12th, 18th and 19th, and 21st to 23rd, whilst Garden Island and Rottnest Island reported consistently high values between the 9th and 24th. Gosnells City in the southeastern suburbs observed the warmest overnight minimum during the month in the Perth area on the 11th with 26.0 °C, while most other sites had their warmest night on the 1st, with some on the 21st and 22nd.

Several sites experienced cool nights on the 5th and 26th. Garden Island recorded an overnight temperature of 13.9 °C on the 5th, its coolest February night in its 11 years of record, while Jandakot Aerodrome recorded the lowest temperature during February 2012 in the Perth area with 8.8 °C on the 26th.

Perth Metro's mean daily minimum temperature in February 2012 was 19.1 °C, which is close to the average of 18.2 °C. Daily minima ranged from a cool 12.1°C on the 26th, which was Perth Metro's coolest night in February since a minimum of 10.0 °C was recorded on 26th February 2010, to a warm 24.3°C on the 1st. Last February (2011), the mean daily minimum temperature was 21.0 °C, which was the 4th warmest on record, and the highest since the Perth Metro record was set in 1985 with a mean minimum of 22.7°C.

Wind and Sunshine

The highest wind gust recorded in the Perth metropolitan area in February was 87 km/h at Champion Lakes on the 7th, due to a strong easterly pressure gradient over the southwest of the state bringing fresh early morning easterly winds to the metropolitan area. Strong easterlies continued on the 8th, with Champion Lakes recording a gust of 85 km/h.

Perth recorded an average daily sunshine of 10.5 hours in February, which is just below the average of 11.0 hours. It was the least sunniest February since a daily mean of 10.4 hours was recorded in 2008.

A stagnant trough over central parts of the SWLD directed smoke from fires in the D'Entrecasteaux and Shannon National Parks (southern Southwest district) over the Perth metropolitan region from the 12th through to the 17th, with particularly thick smoke haze affecting the city from the afternoon of the 14th to the 16th.

Further information

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Extremes in February 2012
Hottest day 41.0 °C at Gosnells City on the 10th
Warmest days on average 32.1 °C at Pearce RAAF
Coolest days on average 27.3 °C at Rottnest Island
28.9 °C at Bickley
Coldest day 22.1 °C at Bickley on the 3rd
Coldest night 8.8 °C at Jandakot Aero on the 26th
Coolest nights on average 16.2 °C at Bickley
Warmest nights on average 20.3 °C at Rottnest Island
19.1 °C at Perth Metro
Warmest night 26.0 °C at Gosnells City on the 11th
Wettest overall 29.8 mm at Whiteman Park
Wettest day 26.2 mm at Whiteman Park on the 3rd
Highest wind gust 87 km/h at Champion Lakes on the 7th

Highest total February rainfall for at least 10 years
Total rainfall
for February 2012 (mm)
Most recent February
at least this wet
Years since
wetter
Average for
February
Pearce RAAF 24.4 27.6 in 1995 17 12.3



Lowest February mean daily maximum temperature for at least 10 years
Mean daily maximum
temperature
for February 2012 (°C)
Most recent February
at least this cool
Years since
cooler
Average for
February
Bickley 28.9 27.8 in 1994 18 30.6
Pearce RAAF 32.1 32.0 in 2002 10 33.2



Record lowest February temperature
Lowest temperature
in February 2012 (°C)
Previous coolest
for February
Years of
record
Average for
February
Garden Island HSF 13.9 on the 5th 14.0 on the 20th in 2002 11 19.3



Summary statistics for February 2012
Maximum temperatures
for February
(°C)
Minimum temperatures
for February
(°C)
Rainfall
for February
(millimetres)
Mean for
February
2012
Diff
from
average
Highest for
February
2012
Mean for
February
2012
Diff
from
average
Lowest for
February
2012
Total for
February
2012
Average
for
February
Rank of
February
2012
Fraction of
February
average
Bickley 28.9 -1.7 37.2 10th 16.2 +0.5 9.2 5th 27.0 20.1 average 134%
Champion Lakes 30.6   38.8 10th 19.1   12.7 5th 11.6
Garden Island HSF 27.9 -0.5 37.3 1st 20.0 +0.7 13.9 5th 10.4 9.6 high 108%
Jandakot Aero 30.9 -0.6 40.3 10th 17.8 +0.8 8.8 26th 16.6 16.8 high 99%
Medina Research Centre 30.7 -0.7 40.0 10th 18.7 +1.2 11.7 26th 14.6 20.1 high 73%
Pearce RAAF 32.1 -1.1 40.3 10th 18.1 +0.6 11.0 26th 24.4 12.3 high 198%
Perth Airport 31.3 -0.6 40.3 10th 18.3 +0.8 9.6 26th 17.8 14.6 high 122%
Perth Metro 31.1 -0.4 40.1 10th 19.1 +0.9 12.1 26th 23.6 12.6 high 187%
Rottnest Island 27.3 +0.1 35.5 1st 20.3 +0.9 14.6 5th 19.2 11.5 high 167%
Swanbourne 30.3 -0.1 40.2 10th 19.1 +0.5 13.1 5th 23.8 7.2 v high 331%

Daily maximum temperature
Central Coast (09)1234567891011121314151617181920212223242526272829
Bickley35.426.822.123.223.726.531.031.833.337.225.625.429.130.232.830.528.029.730.933.735.436.728.826.123.223.527.323.726.0
Champion Lakes35.830.124.825.526.829.333.234.235.538.827.427.230.130.733.231.129.231.733.436.036.037.328.326.824.825.229.226.2
Garden Island HSF37.327.724.323.324.927.430.635.334.336.327.925.425.924.925.124.825.125.829.931.232.527.727.623.724.522.224.328.930.4
Gosnells City38.130.527.028.230.935.035.636.541.029.529.531.432.033.730.032.734.539.028.026.1
Jandakot Aero36.229.925.226.327.429.634.635.036.040.328.628.630.230.131.429.929.031.133.537.235.337.328.426.925.926.129.027.529.6
Medina Research Centre37.629.525.325.027.430.334.535.036.640.030.027.728.529.430.528.428.030.833.737.035.236.729.525.825.324.428.328.330.2
Pearce RAAF39.730.525.126.827.030.235.035.636.240.330.228.931.531.835.432.130.633.734.637.337.439.831.328.026.626.830.428.530.6
Perth Airport37.529.525.527.226.929.634.134.836.240.328.628.630.830.333.330.729.732.133.936.636.637.929.527.525.426.430.428.129.2
Perth Metro37.529.425.126.027.330.034.535.236.640.128.628.930.630.731.929.728.931.434.137.036.536.129.127.425.126.029.227.930.0
Rottnest Island35.526.624.523.723.626.527.931.532.134.826.826.926.625.425.426.226.226.128.129.331.827.926.625.024.523.124.627.028.8
Swanbourne36.228.626.925.128.430.934.636.136.740.228.528.129.627.428.127.927.729.633.936.033.931.828.126.525.325.628.029.430.4

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 minimum temperature
Central Coast (09)1234567891011121314151617181920212223242526272829
Bickley19.320.717.911.09.211.613.915.015.919.118.918.916.316.818.217.816.818.616.415.719.921.319.716.612.711.112.614.014.3
Champion Lakes22.623.220.414.812.715.618.018.719.923.721.421.319.518.518.318.417.121.020.119.624.322.522.819.814.913.515.217.718.2
Garden Island HSF24.323.321.916.913.915.918.219.120.322.922.022.419.920.521.621.320.921.519.919.722.423.720.421.016.816.216.417.618.2
Gosnells City15.013.012.518.318.920.224.226.023.019.818.418.816.721.220.219.919.813.512.6
Jandakot Aero23.622.920.013.712.415.217.018.319.523.018.321.815.315.216.017.916.720.719.519.320.818.421.919.512.38.813.017.217.9
Medina Research Centre24.423.221.314.912.515.417.919.019.922.620.922.518.417.917.618.917.121.219.719.621.919.921.719.814.011.713.317.018.0
Pearce RAAF24.722.920.413.113.615.518.818.620.321.018.620.015.815.215.916.616.120.220.319.823.818.521.418.913.411.014.318.018.2
Perth Airport23.322.720.512.912.115.417.918.619.623.219.322.217.515.716.118.817.620.719.919.424.018.621.520.312.99.616.217.517.9
Perth Metro24.323.020.315.413.515.517.718.819.823.720.422.218.019.017.919.519.121.120.019.623.720.022.620.815.012.115.917.818.3
Rottnest Island23.223.020.317.114.616.619.219.320.623.021.421.720.821.021.421.321.421.820.620.923.922.521.520.118.917.717.218.018.8
Swanbourne24.222.819.814.713.115.618.018.820.221.821.221.718.918.217.919.218.720.720.019.723.621.321.920.215.814.114.617.318.5

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)1234567891011121314151617181920212223242526272829
Bickley - 2.0 24.0 - - - - - - 1.0 - - - - - - - - - - - - - - - - - - -
Champion Lakes - 2.8 8.6 0.2 - - - - - - - - - - - - - - - - - - - - - - - - -
Garden Island HSF - 0.8 9.6 - - - - - - - - - - - - - - - - - - - - - - - - - -
Gosnells City »» 1.8 »» 11.6 - - - - - - - - - - - - - - - - - - - - - 1.0


Jandakot Aero - 1.8 13.6 - - - - - - 0.2 - - - - - - - - - - - - - - - 1.0 - - -
Jarrahdale - 1.4 14.4 - - - - - - - - - - - 0.2 - - - - - - - - - - 0.4 - - -
Medina Research Centre - 3.6 10.0 - - - - - - - - - - - - - - - - - - - - - - 1.0 - - -
Mundaring
4.4 25.0



















0.2




Pearce RAAF - 3.2 21.2 - - - - - - - - - - - - - - - - - - - - -

- - -
Perth Airport - 2.6 15.0 - - - - - - - - - - - - - - - - - - - - - - 0.2 - - -
Perth Metro - 3.0 20.2 - - - - - - - - - - - - - - - - - - - - - - 0.4 - - -
Roleystone
3.6


























Rottnest Island - 1.6 17.2 - - - - - - - - - - - - - - - - - - - - - - 0.4 - - -
Serpentine - 3.6 12.0 - - - - - - - - - - - - - - - - - - - - - - - - - -
Swanbourne - 3.2 20.4 - - - - - - - - - - - - - - - - - - - - - - 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 12 pm on Friday 2 March 2012. 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