Wednesday, 1 May 2013 - Monthly Climate Summary for Perth - Product code IDCKGC11L0
Perth in April 2013: A very warm month
- Rainfall: near average to below average
- Maximum temperature: very much above average; warmest on record for several sites
- Minimum temperature: warmest on record for most sites
Details Extremes Records Summaries Important notes the top
Rainfall
Rainfall across the Perth metropolitan area during April 2013 was near average to below average with monthly rainfall totals generally in the 10 to 30 mm range.
A cloudband associated with ex-tropical cyclone Victoria brought mainly light rainfall from the 11th to 14th to the Perth Metropolitan area with daily rainfall totals mostly less than 5 mm. Generally cloudy conditions with some very light showers continued from the 15th to 18th, although rainfall totals were very low over this period. A middle level cloud band produced showers and thunderstorms across Perth during the morning on the 19th, although again, daily rainfall totals were low and mostly less than 4 mm. A weak cold front crossed the southwest WA on the 20th, with light showers affecting Perth while a stronger cold front moved through the Southwest Land Division (SWLD) during the afternoon of the 21st and morning on the 22nd, bringing the heaviest rainfall of the month to the Perth area, with some moderate falls over 12 mm. Another weak cold front moved through southern WA on the 27th with light showers observed on the 27th and 28th.
Perth Metro recorded 21.0 mm on 10 rain days in April 2013. It was the driest April for 2 years since the 19.4 mm on 7 rain days in 2011. Historically, April rainfall extremes range from nil on three occasions (1920, 1977, and 1982) to 153.6 mm in 2008. Last April (2012), Perth Metro recorded 69.2 mm on 7 rain days.
Maximum temperature
Mean maximum temperatures in April 2013 were 2 °C to 3 °C above average across the Perth metropolitan area, with several sites observing their warmest April on record. The very warm month was mainly due to the generally hot conditions experienced during the first 11 days of April 2013, with the remainder of the month observing mostly closer to average maximum temperatures.
Warm to hot days were experienced across the Perth Metro from the 1st to 4th as a trough near the west coast and a strong high pressure system in the Bight directed northeasterly winds over the area, with daily maxima in high twenties to mid-thirties. Cooler days in the mid-to-high twenties were observed on the 5th and 6th as the trough moved inland, before the hot days resumed from the 7th to 11th as the trough redeveloped near the west coast. One of the hottest April days on record across the Perth area was observed on the 8th with numerous sites breaking their highest April temperature record. Daily maxima was in low thirties on the islands grading to mid-thirties in the western suburbs and hills and reaching the high thirties in the northeast. In addition to breaking its hottest April temperature record on the 8th with a maximum of 35.1 °C, Bickley also equalled the previous record with 34.0 °C on the 11th. Generally mild conditions were observed for the remainder of the month, with the coolest days for April 2013 observed on the 20th and 21st due to cold fronts.
Perth Metro's mean daily maximum temperature in April 2013 was 28.5 °C which was the warmest April since records commenced in 1897, breaking the previous record of 28.2 °C set in 1978 and 1999. Perth Metro recorded four days with a maximum temperature of 36 ° or higher during April 2013, breaking the previous record of one day of 36 °C which has during five other Aprils (1937, 1971, 1978, 2001 and 2007).Interestingly, the mean maximum temperature in April 2013 of 28.3 °C was warmer than 28.0 °C observed in March. This peculiarity of a warmer April than March also occurred in 1924, 1927 and 1999.
Perth Metro's mean daily maximum temperature for the year to date (January to April) was 30.6 °C, which was the equal 3rd hottest start to the year on record, equal with the first four months of 2012.
Minimum temperature
Mean minimum temperatures in April 2013 were very much above average, with some sites more than 3 °C above their April normal. Most of sites recorded their warmest April on record, with mean minima were ranging from mid-teens in the plains and hills to the high teens near the coast and on the islands.
Generally mild to warm nights were experienced from the beginning of the month through to the 19th, with minima generally in mid-to-high teens. Particularly warm conditions were observed at most sites from the 11th through to the 16th, mainly due to middle level cloud, with temperatures remaining in the high teens to low twenties. Bickley broke its previous warmest April minimum temperature of 19.6 °C on three consecutive nights from the 9th to 11th; while Pearce RAAF recorded a daily minimum of 23.0°C on the 3rd which was the highest overnight temperature of the month for the Perth area. Cool nights were recorded on the 23rd, 24th and 29th in the wake of cold fronts, with a number of sites registering overnight temperatures less than 10 °C.
Perth Metro's mean daily minimum temperature in April was 16.7 °C, which was the second warmest April since records commenced in 1897. The warmest April was in 1978 with a mean maximum temperature of 17.3 °C.
As with the maximum temperatures, the mean minimum temperature during April 2013 of 16.7 °C was warmer than the mean minimum temperature of 16.1 °C observed during March, the first occasion since 1962 that this has occurred. Nights warmer in April than March also occurred in 1900, 1918 and 1962.
Sunshine
Perth Metro's mean daily sunshine hours for April was 6.9 hours, which was below the average and the least sunniest April for 32 years since the 6.7 hours in 1981. The average sunshine hours for April is 8.3 hours.
Further information
Western Australia Climate Services CentreBureau of Meteorology
Phone (08) 9263 2222
Email climatedata@bom.gov.au
| Extremes in April 2013 | |
|---|---|
| Hottest day | 39.4 °C at Pearce RAAF on the 8th |
| Warmest days on average | 29.4 °C at Pearce RAAF |
| Coolest days on average | 25.6 °C at Rottnest
Island 26.1 °C at Bickley |
| Coldest day | 18.8 °C at Bickley on the 21st |
| Coldest night | 8.7 °C at Jandakot Aero on the 23rd |
| Coolest nights on average | 15.3 °C at Jandakot Aero |
| Warmest nights on average | 19.3 °C at Rottnest
Island 17.8 °C at Champion Lakes |
| Warmest night | 23.0 °C at Pearce RAAF on the 3rd |
| Wettest overall | 27.4 mm at Medina Research Centre |
| Wettest day | 13.6 mm at Gosnells City on the 22nd |
| Highest wind gust | 63 km/h at Bickley on the 7th |
Extremes Records Summaries Important notes the top
| Record highest April temperature | ||||||
|---|---|---|---|---|---|---|
| Highest temperature in April 2013 (°C) |
Previous warmest for April |
Years of record |
Average for April |
|||
| Perth Airport | 37.7 | on the 8th | = 37.7 | on the 2nd in 1972 | 69 | 25.5 |
| Pearce RAAF | 39.4 | on the 8th | 38.6 | on the 4th in 1972 | 56 | 26.3 |
| Medina Research Centre | 38.1 | on the 8th | 36.5 | on the 16th in 2011 | 27 | 25.6 |
| Jandakot Aero | 37.0 | on the 8th | 36.0 | on the 16th in 2011 | 23 | 25.7 |
| Bickley | 35.1 | on the 8th | 34.0 | on the 4th in 2001 | 20 | 23.5 |
| Gosnells City | 38.5 | on the 8th | 36.8 | on the 4th in 2001 | 20 | 26.3 |
| Garden Island HSF | 35.7 | on the 8th | 34.1 | on the 12th in 2009 | 12 | 23.8 |
| Record highest April mean daily maximum temperature | |||||
|---|---|---|---|---|---|
|
Mean daily maximum temperature for April 2013 (°C) |
Previous warmest for April |
Years of record |
Average for April |
||
| Medina Research Centre | 28.4 | 27.6 | in 2011 | 26 | 25.6 |
| Gosnells City | 28.8 | 28.6 | in 2009 | 19 | 26.3 |
| Perth Metro* | 28.5 | 28.2 | in 1999, 1987 | 116 | 25.8 |
| Swanbourne | 27.9 | 27.8 | in 1999 | 19 | 25.3 |
| Record highest April daily minimum temperature | ||||||
|---|---|---|---|---|---|---|
|
Highest daily minimum temperature in April 2013 (°C) |
Previous warmest for April |
Years of record |
Average for April |
|||
| Bickley | 20.3 | on the 9th | 19.6 | on the 17th in 2011 | 20 | 12.5 |
| Record highest April mean daily minimum temperature | |||||
|---|---|---|---|---|---|
| Mean daily minimum temperature for April 2013 (°C) |
Previous warmest for April |
Years of record |
Average for April |
||
| Perth Airport | 16.1 | 15.2 | in 1978 | 68 | 12.9 |
| Pearce RAAF | 16.3 | 16.0 | in 1978 | 51 | 13.3 |
| Rottnest Island | 19.3 | 18.5 | in 1999 | 23 | 17.2 |
| Jandakot Aero | 15.3 | 14.4 | in 1991 | 22 | 12.3 |
| Bickley | 15.7 | 13.7 | in 1999 | 19 | 12.5 |
| Swanbourne | 17.7 | 16.3 | in 2011 | 19 | 15.1 |
| Garden Island HSF | 18.3 | 17.2 | in 2011 | 11 | 15.8 |
Extremes Records Summaries Important notes the top
| Summary statistics for April 2013 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperatures for April (°C) |
Minimum temperatures for April (°C) |
Rainfall for April (millimetres) |
||||||||||
| Mean for April 2013 |
Diff from average |
Highest for April 2013 |
Mean for April 2013 |
Diff from average |
Lowest for April 2013 |
Total for April 2013 |
Average for April |
Rank of April 2013 |
Fraction of April average |
|||
| Bickley | 26.1 | +2.6 | 35.1 | 8th | 15.7 | +3.2 | 9.8 | 29th | 16.8 | 55.4 | low | 30% |
| Champion Lakes | 27.8 | 35.8 | 8th | 17.8 | 11.6 | 23rd | 15.0 | |||||
| Garden Island HSF | 25.7 | +1.9 | 35.7 | 8th | 18.3 | +2.5 | 13.6 | 29th | 26.4 | 43.2 | low | 61% |
| Gosnells City | 28.8 | +2.5 | 38.5 | 8th | 0.0 | 29th | 21.3 | 44.1 | low | 48% | ||
| Jandakot Aero | 28.0 | +2.3 | 37.0 | 8th | 15.3 | +3.0 | 8.7 | 23rd | 19.2 | 42.9 | average | 45% |
| Medina Research Centre | 28.4 | +2.8 | 38.1 | 8th | 12.0 | 29th | 27.4 | 39.8 | average | 69% | ||
| Pearce RAAF | 29.4 | +3.1 | 39.4 | 8th | 16.3 | +3.0 | 9.2 | 23rd | 16.0 | 34.6 | low | 46% |
| Perth Airport | 28.7 | +3.2 | 37.7 | 8th | 16.1 | +3.2 | 9.6 | 23rd | 7.6 | 40.9 | low | 19% |
| Perth Metro* | 28.5 | +2.7 | 37.3 | 8th | 16.7 | +3.1 | 11.0 | 23rd | 21.0 | 44.1 | average | 48% |
| Rottnest Island | 25.6 | +1.9 | 32.6 | 8th | 19.3 | +2.1 | 14.3 | 29th | 16.0 | 35.5 | low | 45% |
| Swanbourne | 27.9 | +2.6 | 35.8 | 8th | 17.7 | +2.6 | 12.6 | 23rd | 13.8 | 38.2 | low | 36% |
Extremes Records Summaries Important notes the top
| Daily maximum temperature | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Central Coast (09) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| Bickley | 29.2 | 29.4 | 31.3 | 33.1 | 25.8 | 25.4 | 28.7 | 35.1 | 33.9 | 32.9 | 34.0 | 22.6 | 24.8 | 25.6 | 26.6 | 24.1 | 24.1 | 23.2 | 25.0 | 19.7 | 18.8 | 19.6 | 22.0 | 25.2 | 24.7 | 23.6 | 22.8 | 22.2 | 22.1 | 28.0 |
| Champion Lakes | 31.4 | 31.3 | 33.6 | 34.4 | 26.6 | 27.6 | 31.9 | 35.8 | 33.1 | 34.1 | 34.9 | 23.7 | 27.7 | 26.6 | 28.0 | 26.2 | 25.9 | 25.1 | 26.1 | 21.6 | 20.9 | 22.1 | 23.8 | 27.2 | 28.7 | 24.5 | 24.5 | 23.3 | 23.7 | 29.2 |
| Garden Island HSF | 30.2 | 30.2 | 32.4 | 30.7 | 24.1 | 26.3 | 28.9 | 35.7 | 25.6 | 29.6 | 30.6 | 22.3 | 25.6 | 24.5 | 26.0 | 24.5 | 25.3 | 25.2 | 25.5 | 20.6 | 21.6 | 21.8 | 22.2 | 24.0 | 24.0 | 22.7 | 24.6 | 20.9 | 21.0 | 23.2 |
| Gosnells City | 32.7 | 33.2 | 35.3 | 36.7 | 28.0 | 28.5 | 32.7 | 38.5 | 34.9 | 36.4 | 24.5 | 28.0 | 27.5 | 29.3 | 27.4 | 27.2 | 26.5 | 27.0 | 22.0 | 22.9 | 23.6 | 24.8 | 27.8 | 27.4 | 26.2 | 25.8 | 24.7 | 24.5 | 31.8 | |
| Jandakot Aero | 31.9 | 32.2 | 34.0 | 35.8 | 26.5 | 28.4 | 31.4 | 37.0 | 32.6 | 33.8 | 34.9 | 23.2 | 27.3 | 27.1 | 28.2 | 26.7 | 25.7 | 25.6 | 26.6 | 22.0 | 22.1 | 23.0 | 23.8 | 27.5 | 27.0 | 24.8 | 24.7 | 23.6 | 23.7 | 29.5 |
| Medina Research Centre | 32.4 | 33.1 | 35.0 | 34.8 | 26.0 | 28.9 | 32.3 | 38.1 | 32.0 | 32.7 | 33.6 | 23.0 | 27.6 | 26.4 | 27.8 | 26.0 | 26.4 | 26.6 | 27.5 | 21.5 | 21.7 | 22.8 | 24.4 | 26.4 | 23.2 | |||||
| Pearce RAAF | 32.4 | 32.7 | 34.9 | 28.9 | 28.7 | 32.3 | 39.4 | 37.9 | 36.6 | 37.2 | 25.5 | 28.4 | 29.9 | 29.5 | 27.5 | 27.3 | 26.2 | 27.8 | 23.5 | 22.6 | 23.3 | 24.8 | 29.5 | 28.6 | 27.2 | 26.4 | 26.0 | 26.1 | 31.3 | |
| Perth Airport | 31.8 | 32.0 | 34.3 | 36.3 | 27.7 | 28.9 | 31.5 | 37.7 | 34.5 | 36.1 | 36.5 | 24.5 | 27.4 | 28.3 | 28.3 | 26.0 | 26.9 | 25.6 | 27.0 | 22.9 | 22.2 | 23.0 | 24.6 | 28.4 | 27.9 | 25.5 | 25.3 | 24.8 | 24.6 | 30.2 |
| Perth Metro | 31.7 | 32.0 | 34.4 | 36.2 | 27.3 | 28.4 | 31.7 | 37.3 | 33.8 | 36.4 | 36.2 | 24.0 | 27.0 | 28.5 | 28.7 | 26.4 | 26.6 | 25.5 | 26.6 | 21.9 | 22.5 | 23.1 | 24.1 | 28.4 | 26.4 | 25.1 | 25.1 | 24.2 | 24.3 | 30.0 |
| Rottnest Island | 29.9 | 29.4 | 32.4 | 28.3 | 24.8 | 24.6 | 26.3 | 32.6 | 26.5 | 29.9 | 29.2 | 22.2 | 25.0 | 25.7 | 25.9 | 24.2 | 25.1 | 24.5 | 25.5 | 21.1 | 21.8 | 23.5 | 22.2 | 26.1 | 24.4 | 24.1 | 24.5 | 21.6 | 21.3 | 26.8 |
| Swanbourne | 31.3 | 32.9 | 34.4 | 33.6 | 26.1 | 29.8 | 32.5 | 35.8 | 28.6 | 35.1 | 34.0 | 23.1 | 27.7 | 27.0 | 26.6 | 25.9 | 25.9 | 24.9 | 25.6 | 23.0 | 23.0 | 23.7 | 24.3 | 27.9 | 26.3 | 24.9 | 25.4 | 23.9 | 24.1 | 29.3 |
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 |
Extremes Records Summaries Important notes the top
| Daily minimum temperature | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Central Coast (09) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| Bickley | 13.7 | 14.5 | 16.7 | 18.6 | 17.3 | 15.4 | 14.8 | 17.2 | 20.3 | 19.7 | 20.0 | 19.3 | 17.2 | 18.6 | 18.2 | 18.8 | 17.0 | 15.6 | 16.1 | 14.2 | 10.5 | 13.3 | 11.3 | 12.3 | 15.6 | 16.4 | 13.9 | 13.4 | 9.8 | 12.3 |
| Champion Lakes | 17.7 | 17.6 | 20.6 | 20.7 | 18.7 | 16.5 | 18.3 | 21.1 | 17.6 | 19.5 | 22.8 | 22.3 | 20.4 | 19.7 | 19.9 | 20.7 | 19.9 | 17.6 | 18.7 | 15.2 | 13.3 | 15.8 | 11.6 | 15.0 | 18.9 | 16.8 | 13.2 | 15.1 | 13.7 | 15.5 |
| Garden Island HSF | 16.7 | 18.3 | 19.0 | 18.9 | 19.6 | 18.8 | 17.6 | 19.6 | 18.7 | 19.5 | 20.0 | 21.3 | 20.3 | 20.1 | 20.2 | 21.8 | 19.9 | 18.4 | 19.2 | 17.6 | 14.9 | 16.6 | 15.1 | 15.4 | 18.0 | 17.4 | 19.9 | 15.8 | 13.6 | 15.6 |
| Gosnells City | 19.5 | 17.9 | 19.8 | 20.7 | 19.0 | 17.0 | 18.5 | 20.3 | 16.9 | 19.5 | 22.3 | 20.0 | 20.0 | 19.9 | 20.7 | 19.9 | 17.0 | 18.5 | 18.0 | 10.0 | 0.0 | |||||||||
| Jandakot Aero | 14.0 | 13.9 | 16.1 | 17.2 | 15.8 | 16.2 | 17.5 | 17.7 | 13.2 | 16.3 | 18.9 | 20.4 | 19.3 | 19.5 | 18.5 | 20.1 | 18.6 | 14.4 | 17.3 | 12.8 | 10.5 | 15.9 | 8.7 | 10.4 | 14.5 | 13.9 | 11.2 | 11.2 | 12.1 | 13.0 |
| Medina Research Centre | 12.6 | 17.0 | 17.0 | 19.5 | 16.7 | 17.3 | 17.0 | 17.7 | 15.5 | 17.4 | 18.5 | 21.0 | 19.7 | 19.8 | 18.8 | 20.1 | 19.2 | 16.0 | 18.2 | 17.5 | 14.0 | 12.0 | ||||||||
| Pearce RAAF | 19.0 | 16.2 | 23.0 | 18.1 | 16.9 | 16.3 | 17.7 | 19.1 | 13.6 | 16.8 | 21.4 | 21.2 | 19.5 | 19.8 | 18.2 | 19.0 | 18.4 | 16.1 | 17.5 | 14.4 | 11.9 | 15.0 | 9.2 | 9.6 | 18.4 | 15.4 | 10.6 | 10.2 | 13.2 | 14.4 |
| Perth Airport | 16.5 | 15.0 | 16.8 | 18.3 | 16.3 | 17.1 | 18.0 | 19.1 | 14.4 | 17.5 | 21.1 | 21.4 | 19.3 | 20.6 | 19.7 | 19.5 | 18.7 | 15.1 | 17.4 | 13.6 | 10.4 | 14.9 | 9.6 | 9.9 | 16.5 | 15.3 | 11.7 | 11.6 | 13.3 | 15.1 |
| Perth Metro | 14.9 | 13.0 | 16.2 | 18.1 | 18.2 | 18.1 | 17.7 | 18.2 | 15.9 | 18.5 | 20.0 | 21.0 | 19.7 | 20.8 | 20.7 | 20.8 | 19.7 | 16.7 | 18.1 | 16.0 | 13.2 | 15.6 | 11.0 | 11.5 | 15.7 | 16.3 | 13.6 | 14.1 | 12.2 | 14.7 |
| Rottnest Island | 19.2 | 20.1 | 21.0 | 21.5 | 20.2 | 19.3 | 17.8 | 20.1 | 20.8 | 21.2 | 22.2 | 21.7 | 20.4 | 19.7 | 21.3 | 21.2 | 20.4 | 19.8 | 20.2 | 16.8 | 16.4 | 15.9 | 16.1 | 17.4 | 19.6 | 19.7 | 19.0 | 18.5 | 14.3 | 16.9 |
| Swanbourne | 17.4 | 16.3 | 18.7 | 20.6 | 20.1 | 17.6 | 17.5 | 19.8 | 18.1 | 19.1 | 22.0 | 21.2 | 19.7 | 20.3 | 20.4 | 21.2 | 19.2 | 17.4 | 17.9 | 16.4 | 14.0 | 15.9 | 12.6 | 12.6 | 16.6 | 18.5 | 15.7 | 14.7 | 12.8 | 15.6 |
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 |
Extremes Records Summaries Important notes the top
| Daily rainfall | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Central Coast (09) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| Bickley | - | - | - | - | - | - | - | 0.2 | - | - | 0.4 | 2.0 | 0.2 | - | - | - | - | 0.6 | 0.2 | - | 12.6 | 0.2 | - | - | - | - | 0.4 | - | - | |
| Champion Lakes | - | - | - | - | - | - | - | - | - | - | - | - | 1.8 | 2.8 | - | - | - | - | 1.6 | - | - | 8.4 | - | - | - | - | - | 0.4 | - | - |
| Garden Island HSF | - | - | - | - | - | - | - | - | - | - | - | - | 5.0 | 8.4 | 0.2 | - | - | 0.2 | - | - | 1.2 | 6.0 | - | - | - | - | - | 5.4 | - | - |
| Gosnells City | - | - | - | - | - | - | - | - | - | - | »» | 0.2 | »» | »» | »» | 0.1 | - | - | 1.1 | 1.2 | 1.2 | 13.6 | 0.1 | - | - | - | - | 0.8 | - | - |
| Jandakot Aero | - | - | - | - | - | - | - | - | - | - | - | - | 2.8 | 1.0 | - | - | 0.2 | - | 2.2 | - | - | 12.2 | - | - | - | - | - | 0.8 | - | - |
| Jarrahdale | - | - | 0.2 | - | - | - | - | - | - | - | - | - | 3.8 | 2.8 | - | 0.4 | 0.4 | 0.2 | - | - | 0.2 | 8.2 | 0.4 | - | 0.2 | - | - | 1.8 | 0.2 | - |
| Medina Research Centre | - | - | - | - | - | - | - | - | - | - | - | 0.2 | 5.0 | 7.3 | 0.2 | 0.1 | 0.1 | - | - | 7.0 | 0.1 | 7.4 | - | - | - | - | - | - | - | |
| Pearce RAAF | - | - | - | - | - | - | - | - | - | - | 0.4 | 0.4 | 2.8 | 1.4 | - | 0.2 | - | 1.8 | 0.2 | - | - | 8.8 | - | - | - | - | - | - | - | - |
| Perth Airport | - | - | - | - | - | - | - | - | - | - | - | - | 1.8 | 0.2 | - | - | - | - | 0.8 | 0.4 | - | 4.2 | 0.2 | - | - | - | - | - | - | - |
| Perth Metro | - | - | - | - | - | - | - | - | - | - | 0.2 | 0.4 | 2.8 | - | - | - | - | - | 3.6 | 0.4 | 0.2 | 12.6 | 0.4 | - | - | - | - | 0.2 | 0.2 | - |
| Roleystone | - | - | - | - | - | - | - | - | - | 0.2 | - | 0.6 | 2.0 | 0.4 | 3.4 | 2.0 | - | - | 0.4 | 0.2 | - | 8.6 | 0.2 | - | - | - | - | 1.0 | ||
| Rottnest Island | - | - | - | - | 0.2 | - | - | - | 0.2 | - | - | 0.2 | 4.2 | 4.2 | - | - | 0.2 | - | - | 0.4 | 0.4 | 5.8 | 0.2 | - | - | - | - | - | - | - |
| Serpentine | - | - | - | - | - | - | - | - | - | - | - | - | 3.6 | 1.6 | - | - | - | 0.4 | - | - | - | 6.0 | - | - | - | - | - | 0.6 | - | - |
| Swanbourne | - | - | - | - | - | - | - | - | - | - | - | - | 3.8 | 0.2 | - | 0.2 | - | 0.2 | 1.6 | 0.4 | - | 6.0 | - | - | - | - | - | 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.
Extremes Records Summaries Important notes the top
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 2 pm on Wednesday 1 May 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.
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.
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
Western Australia Climate Services CentreBureau of Meteorology
Phone (08) 9263 2222
Email climatedata@bom.gov.au
