Tuesday, 2 April 2013 - Monthly Climate Summary for Perth - Product code IDCKGC11L0
Perth in March 2013: Wet and cool
- Rainfall: above average
- Maximum temperature: below average
- Minimum temperature: near average
Details Extremes Records Summaries Important notes the top
Rainfall
Rainfall across the Perth metropolitan area during March 2013 was above average with monthly rainfall totals generally in the 50 to 70 mm range as a result of several rainfall events during the month.
Light showers were observed in the Perth metropolitan area on the 4th and 5th, with daily rainfall generally less than 2 mm, as a weak cold front moved across southwest WA. A middle level trough produced light to moderate rainfall in the Perth metropolitan area on the 10th and morning on the 11th as a number of sites reported rainfall in the 10 to 20 mm range. This was the heaviest rainfall for many sites since mid-December. Another significant rainfall event occurred on the 14th as a result of a nearby middle level trough, with daily totals in this event mostly in the 20 and 30 mm range across the metropolitan area. A strong cold front produced the third notable rainfall event of the month in the evening of the 25th and morning of the 26th with rainfall totals in Perth generally in the 15 to 25 mm range.
Perth Metro recorded 69.6 mm of rainfall on 6 rain days during March 2013, which is its fourth wettest March on record and the wettest March since 71.1 mm was recorded in 1971. The highest daily fall occurred on the 15th when 26.2 mm was recorded, the wettest March day at Perth Metro since the Perth hailstorm in 2010, when 40.2 mm was recorded in the 24 hours to 9am on the 23rd. The average rainfall for Perth Metro in March is 19.2 mm, whilst last March (2012) only 0.2 mm was recorded.
Maximum temperature
Mean maximum temperatures in March 2013 were 1 °C to 2 °C below average across the Perth metropolitan area, with mean maxima in the mid-to-high twenties.
Warm to hot days were experienced in the Perth area on the 1st, with temperatures at most sites in the low to mid-thirties, while another warm period was observed from the 7th to 10th. The 9th was the hottest day of the month for most sites and the maximum of 36.9 °C recorded at Swanbourne was the highest temperature of the month for Perth metropolitan area. It was cool to mild for much of the remainder of March 2013, particularly from the middle of the month. The coolest day for all sites was the 26th during the passage of a strong cold front and daily maxima in the Perth area only reached the high teens and low twenties, with Bickley the coldest location with 16.9 °C. Garden Island recorded a mean maximum temperature of 25.4 °C for March 2013 which is 2 °C below the average and the coolest March day in its 11 years of record.
Perth Metro's mean maximum temperature of 28.0 °C during March 2013 was below average and the coolest March for 14 years since a mean maximum of 27.8 °C in 1999. The average maximum temperature for March is 29.7 °C. Daily maxima ranged from a hot 34.8 °C on the 9th to a cool 20.4 °C on the 26th. This was the first time in 14 years, since 1999, that Perth Metro didn't record a maximum temperature of 35 °C or higher in March.
Minimum temperature
Mean minimum temperatures in March 2013 were generally close to average across the Perth metropolitan area; however, Swanbourne recorded a below average mean of 16.9 ° which is 1.1 °C below normal. Mean minima were ranged from the low to mid-teens in the hills to the high teens near the coast and on the islands.
The warmest night was experienced on the 10th, with daily maxima in the low-to-mid twenties across the Perth metropolitan area, and the minimum of 25.4 °C at Pearce RAAF was the highest overnight temperature of the month in the region. In contrast, the coolest night occurred on the 27th at most sites across Perth following low day-time temperatures the previous day. The lowest minimum temperature of the month was 5.3 °C at Bickley.
Perth Metro's mean daily minimum temperature in March was 16.1 °C, close to the average of 16.6 °C. Daily minima ranged from a warm 23.0 °C on the 10th to a cool 8.2 °C on the 27th.
Sunshine
The mean sunshine for March 2013 was 9.2 hours per day, which is slightly below the average of 9.6 hours.
Details Extremes Records Summaries Important notes the top
Further information
Western Australia Climate Services CentreBureau of Meteorology
Phone (08) 9263 2222
Email climatedata@bom.gov.au
| Extremes in March 2013 | |
|---|---|
| Hottest day | 36.9 °C at Swanbourne on the 9th |
| Warmest days on average | 29.4 °C at Pearce RAAF |
| Coolest days on average | 25.1 °C at Rottnest
Island 25.8 °C at Bickley |
| Coldest day | 16.9 °C at Bickley on the 26th |
| Coldest night | 5.3 °C at Jandakot Aero on the 27th |
| Coolest nights on average | 13.9 °C at Bickley |
| Warmest nights on average | 18.4 °C at Rottnest
Island 16.7 °C at Champion Lake |
| Warmest night | 25.4 °C at Pearce RAAF on the 10th |
| Wettest overall | 75.6 mm at Gosnells City |
| Wettest day | 34.6 mm at Bickley on the 15th |
| Highest wind gust | 100 km/h at Rottnest Island on the 26th |
Extremes Records Summaries Important notes the top
| Record lowest March mean daily maximum temperature | |||||
|---|---|---|---|---|---|
|
Mean daily maximum temperature for March 2013 (°C) |
Previous coolest for March |
Years of record |
Average for March |
||
| Garden Island HSF | 25.4 | 25.8 | in 2004 | 11 | 27.5 |
Extremes Records Summaries Important notes the top
| Summary statistics for March 2013 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperatures for March (°C) |
Minimum temperatures for March (°C) |
Rainfall for March (millimetres) |
||||||||||
| Mean for March 2013 |
Diff from average |
Highest for March 2013 |
Mean for March 2013 |
Diff from average |
Lowest for March 2013 |
Total for March 2013 |
Average for March |
Rank of March 2013 |
Fraction of March average |
|||
| Bickley | 25.8 | -2.4 | 31.8 | 9th | 13.9 | -0.6 | 8.0 | 12th | 73.6 | 25.2 | v high | 292% |
| Champion Lakes | 27.6 | 34.3 | 9th | 16.7 | 8.9 | 27th | 72.8 | |||||
| Garden Island HSF | 25.4 | -2.1 | 33.8 | 9th | 17.9 | -0.3 | 11.8 | 27th | 39.4 | 14.6 | high | 270% |
| Gosnells City | 29.0 | -1.6 | 36.4 | 9th | 16.3 | -0.9 | 9.2 | 27th | 75.6 | 16.9 | v high | 447% |
| Jandakot Aero | 28.1 | -1.6 | 35.0 | 9th | 14.8 | -0.6 | 5.3 | 27th | 61.6 | 16.1 | v high | 383% |
| Medina Research Centre | 27.8 | -1.6 | 35.1 | 1st | 15.5 | -0.4 | 7.8 | 27th | 53.1 | 19.5 | v high | 272% |
| Pearce RAAF | 29.4 | -1.1 | 35.2 | 9th | 15.6 | -0.4 | 6.6 | 27th | 61.2 | 15.1 | v high | 405% |
| Perth Airport | 28.4 | -1.3 | 35.2 | 9th | 15.2 | -0.7 | 6.2 | 27th | 33.0 | 15.9 | high | 208% |
| Perth Metro | 28.0 | -1.7 | 34.8 | 9th | 16.1 | -0.5 | 8.2 | 27th | 69.6 | 19.2 | highest | 363% |
| Rottnest Island | 25.1 | -1.1 | 30.9 | 9th | 18.4 | -0.3 | 12.5 | 26th | 60.6 | 14.3 | high | 424% |
| Swanbourne | 27.8 | -1.2 | 36.9 | 9th | 16.3 | -1.1 | 10.2 | 27th | 64.8 | 22.3 | v high | 291% |
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 | 31 |
| Bickley | 30.8 | 28.1 | 29.3 | 24.3 | 25.0 | 29.8 | 30.1 | 30.7 | 31.8 | 27.3 | 23.6 | 22.6 | 25.6 | 19.8 | 26.9 | 26.1 | 29.4 | 29.6 | 29.0 | 23.1 | 23.2 | 24.2 | 24.1 | 27.5 | 22.0 | 16.9 | 20.6 | 22.5 | 24.6 | 24.6 | 27.5 |
| Champion Lakes | 32.7 | 28.3 | 29.6 | 25.6 | 26.5 | 31.9 | 31.7 | 32.3 | 34.3 | 30.5 | 25.5 | 24.6 | 27.4 | 23.9 | 29.2 | 28.2 | 30.9 | 31.0 | 29.6 | 24.7 | 24.0 | 25.3 | 25.0 | 28.4 | 23.8 | 19.7 | 22.9 | 25.5 | 26.5 | 27.6 | 29.7 |
| Garden Island HSF | 32.8 | 25.2 | 27.0 | 26.3 | 26.0 | 25.3 | 28.4 | 29.3 | 33.8 | 29.5 | 23.1 | 24.6 | 29.1 | 23.6 | 25.4 | 30.0 | 26.2 | 25.4 | 27.6 | 22.8 | 21.0 | 21.8 | 22.0 | 22.3 | 21.8 | 19.2 | 20.8 | 22.0 | 24.4 | 22.2 | 27.3 |
| Gosnells City | 34.0 | 29.0 | 31.5 | 27.5 | 28.2 | 33.0 | 34.5 | 36.4 | 31.7 | 26.5 | 25.8 | 29.0 | 30.5 | 30.5 | 32.9 | 30.8 | 26.2 | 25.6 | 27.0 | 25.6 | 29.8 | 24.9 | 20.4 | 24.1 | 27.0 | 28.5 | 30.0 | 31.0 | |||
| Jandakot Aero | 34.3 | 27.6 | 30.8 | 27.2 | 27.1 | 30.7 | 32.9 | 32.5 | 35.0 | 31.6 | 26.4 | 25.7 | 28.9 | 24.4 | 29.0 | 29.6 | 30.7 | 30.2 | 29.5 | 25.3 | 23.9 | 25.7 | 25.5 | 27.5 | 24.8 | 20.5 | 23.7 | 25.1 | 26.5 | 27.3 | 30.2 |
| Medina Research Centre | 35.1 | 26.7 | 31.0 | 27.8 | 27.1 | 30.0 | 32.4 | 33.0 | 35.0 | 33.3 | 25.3 | 25.4 | 29.0 | 25.0 | 29.1 | 29.2 | 30.1 | 29.1 | 30.4 | 24.8 | 23.1 | 24.8 | 24.0 | 26.0 | 23.9 | 20.5 | 23.0 | 24.5 | 27.0 | 26.5 | 30.7 |
| Pearce RAAF | 33.9 | 30.7 | 33.1 | 28.5 | 29.0 | 33.4 | 33.0 | 34.0 | 35.2 | 32.2 | 28.4 | 26.8 | 29.8 | 24.4 | 30.2 | 31.3 | 32.6 | 33.0 | 32.5 | 26.1 | 26.5 | 27.2 | 27.9 | 30.7 | 24.4 | 20.8 | 24.1 | 25.6 | 27.8 | 28.4 | 30.6 |
| Perth Airport | 34.0 | 28.5 | 30.6 | 26.9 | 27.3 | 32.1 | 32.7 | 33.4 | 35.2 | 31.2 | 27.4 | 25.9 | 28.8 | 23.0 | 29.7 | 29.8 | 31.7 | 30.9 | 30.0 | 25.5 | 24.7 | 26.7 | 26.1 | 28.2 | 24.6 | 20.4 | 23.6 | 25.3 | 27.3 | 28.0 | 30.2 |
| Perth Metro | 33.8 | 28.3 | 30.3 | 27.3 | 27.5 | 30.1 | 31.1 | 33.5 | 34.8 | 30.8 | 26.2 | 25.6 | 28.2 | 24.4 | 29.2 | 29.7 | 31.3 | 30.1 | 29.3 | 24.9 | 24.2 | 25.6 | 25.4 | 28.2 | 23.7 | 20.4 | 23.6 | 24.9 | 27.4 | 27.3 | 30.1 |
| Rottnest Island | 29.9 | 25.6 | 27.5 | 26.8 | 26.9 | 25.4 | 26.4 | 29.1 | 30.9 | 27.7 | 23.8 | 22.6 | 25.7 | 22.9 | 25.6 | 27.0 | 26.0 | 25.2 | 26.6 | 24.3 | 21.6 | 22.8 | 23.1 | 23.3 | 22.8 | 19.7 | 21.5 | 22.1 | 24.3 | 23.2 | 26.6 |
| Swanbourne | 35.6 | 26.6 | 28.1 | 28.0 | 27.1 | 29.4 | 31.5 | 34.1 | 36.9 | 30.2 | 25.9 | 27.4 | 30.2 | 24.4 | 28.5 | 31.0 | 29.5 | 28.4 | 27.5 | 26.0 | 23.6 | 25.4 | 24.9 | 25.0 | 24.3 | 21.1 | 23.4 | 24.8 | 28.0 | 25.9 | 29.7 |
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 | 31 |
| Bickley | 16.2 | 14.5 | 15.3 | 17.6 | 14.4 | 14.5 | 14.9 | 14.2 | 15.2 | 20.0 | 18.2 | 8.0 | 10.4 | 13.2 | 12.9 | 16.4 | 17.1 | 17.6 | 18.2 | 15.8 | 12.9 | 10.3 | 11.6 | 11.9 | 14.3 | 10.4 | 8.9 | 9.7 | 12.1 | 11.9 | 11.9 |
| Champion Lakes | 19.9 | 18.2 | 16.7 | 19.7 | 15.4 | 16.7 | 18.6 | 18.2 | 19.3 | 23.5 | 20.1 | 12.4 | 14.4 | 18.1 | 15.7 | 20.2 | 20.8 | 20.0 | 20.0 | 18.2 | 17.0 | 13.4 | 12.9 | 13.6 | 13.2 | 12.5 | 8.9 | 13.5 | 16.0 | 15.2 | 15.3 |
| Garden Island HSF | 20.9 | 18.9 | 17.3 | 21.1 | 21.5 | 19.4 | 18.3 | 18.6 | 19.9 | 22.9 | 20.3 | 13.9 | 14.9 | 18.6 | 16.2 | 20.0 | 20.6 | 21.0 | 20.9 | 20.0 | 16.9 | 14.6 | 16.1 | 16.8 | 16.4 | 14.2 | 11.8 | 14.3 | 16.3 | 15.7 | 15.2 |
| Gosnells City | 18.0 | 17.5 | 19.5 | 15.4 | 16.1 | 18.4 | 19.5 | 22.0 | 20.1 | 11.3 | 14.5 | 15.9 | 20.0 | 19.5 | 18.8 | 14.8 | 14.0 | 14.0 | 14.2 | 14.2 | 9.2 | 13.6 | 14.0 | 16.5 | 17.0 | ||||||
| Jandakot Aero | 19.2 | 14.9 | 13.8 | 16.2 | 14.8 | 14.1 | 18.0 | 18.0 | 18.9 | 23.4 | 19.4 | 6.8 | 13.8 | 18.0 | 15.7 | 19.7 | 18.8 | 17.2 | 17.0 | 17.4 | 16.4 | 8.4 | 9.3 | 8.7 | 12.1 | 12.3 | 5.3 | 11.4 | 13.7 | 12.6 | 12.4 |
| Medina Research Centre | 19.4 | 14.9 | 15.2 | 15.8 | 15.6 | 15.7 | 17.2 | 18.1 | 19.0 | 23.0 | 20.2 | 10.2 | 14.1 | 18.3 | 15.7 | 19.0 | 19.4 | 18.5 | 18.0 | 17.9 | 16.3 | 10.0 | 12.0 | 12.0 | 13.4 | 12.4 | 7.8 | 11.8 | 15.0 | 12.0 | 13.1 |
| Pearce RAAF | 20.4 | 17.6 | 13.4 | 15.9 | 11.8 | 10.7 | 18.9 | 18.9 | 19.8 | 25.4 | 20.5 | 11.1 | 14.8 | 19.0 | 16.2 | 20.0 | 20.8 | 17.2 | 18.2 | 18.1 | 16.7 | 10.8 | 9.7 | 8.9 | 12.4 | 6.6 | 10.4 | 13.6 | 13.4 | 15.7 | |
| Perth Airport | 18.9 | 17.1 | 15.9 | 17.7 | 13.0 | 13.0 | 18.2 | 18.0 | 19.1 | 23.1 | 20.1 | 11.0 | 14.3 | 16.9 | 14.9 | 19.8 | 20.5 | 17.3 | 17.9 | 18.6 | 16.4 | 12.8 | 9.4 | 9.5 | 10.4 | 12.6 | 6.2 | 10.6 | 12.4 | 14.0 | 13.0 |
| Perth Metro | 20.0 | 17.4 | 16.3 | 18.4 | 15.5 | 16.9 | 18.3 | 18.1 | 19.2 | 23.0 | 20.4 | 12.0 | 14.4 | 16.9 | 15.5 | 19.8 | 19.7 | 19.2 | 18.8 | 19.3 | 16.0 | 12.1 | 12.8 | 12.7 | 14.7 | 12.6 | 8.2 | 11.4 | 14.5 | 13.1 | 12.4 |
| Rottnest Island | 21.5 | 19.2 | 20.3 | 21.0 | 20.2 | 20.0 | 18.7 | 19.3 | 20.4 | 22.8 | 20.5 | 15.3 | 15.1 | 18.1 | 16.0 | 19.8 | 20.9 | 21.1 | 21.0 | 20.4 | 17.3 | 15.8 | 18.0 | 17.7 | 18.7 | 12.5 | 14.2 | 15.1 | 17.0 | 16.6 | 16.8 |
| Swanbourne | 19.9 | 17.1 | 16.9 | 18.8 | 16.5 | 16.4 | 17.6 | 18.6 | 19.8 | 22.8 | 20.0 | 11.2 | 14.5 | 16.5 | 15.7 | 19.5 | 19.4 | 18.9 | 19.1 | 19.2 | 16.0 | 12.3 | 14.0 | 12.9 | 15.0 | 11.9 | 10.2 | 12.2 | 15.3 | 12.5 | 14.2 |
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 |
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 | 31 |
| Bickley | - | - | - | 1.4 | 0.8 | 0.4 | - | - | - | - | 10.2 | 1.2 | - | 0.4 | 34.6 | - | - | - | - | - | - | - | - | - | - | 24.2 | - | 0.4 | - | - | - |
| Champion Lakes | - | - | - | - | 0.4 | - | - | - | - | - | 17.0 | 8.0 | - | - | 24.8 | - | - | - | - | - | - | - | - | - | - | 22.6 | - | - | - | - | - |
| Garden Island HSF | - | - | - | - | - | - | - | - | - | - | 4.0 | - | - | - | 18.8 | - | - | - | - | - | - | - | - | - | - | 16.4 | 0.2 | - | - | - | - |
| Gosnells City | »» | »» | »» | »» | 1.4 | »» | »» | »» | »» | »» | 17.6 | 1.0 | - | »» | 27.8 | - | - | - | - | - | - | - | - | - | - | 24.4 | - | - | - | - | - |
| Jandakot Aero | - | - | - | 0.8 | 0.4 | - | - | - | - | - | 5.0 | - | - | - | 30.4 | - | - | - | - | - | - | - | - | - | - | 25.0 | - | - | - | - | - |
| Jarrahdale | - | - | - | 0.4 | - | 0.4 | - | - | - | - | 15.8 | - | - | - | 22.0 | - | - | - | - | 0.2 | - | - | - | 0.2 | - | 18.0 | 0.4 | - | 0.2 | - | 0.4 |
| Medina Research Centre | - | - | - | - | - | - | - | - | - | 0.2 | 16.4 | - | - | 0.2 | 19.2 | - | - | - | - | - | - | - | - | - | - | 17.0 | 0.1 | - | - | - | - |
| Pearce RAAF | - | - | - | 0.2 | 0.2 | - | - | - | - | - | 6.8 | - | - | 0.4 | 34.2 | - | - | - | 0.2 | - | - | - | - | 19.2 | - | - | - | - | - | ||
| Perth Airport | - | - | - | 0.6 | 1.4 | - | - | - | - | - | 10.0 | 1.6 | - | 0.2 | 25.0 | - | - | - | - | - | - | - | - | - | - | 19.0 | 0.2 | - | - | - | - |
| Perth Metro | - | - | - | 0.2 | 0.2 | - | - | - | - | - | 18.0 | - | - | 0.4 | 26.2 | - | - | - | - | - | - | - | - | - | - | 24.6 | - | - | - | - | - |
| Roleystone | - | - | - | 1.4 | 3.2 | 0.4 | - | - | - | - | 21.4 | 0.4 | - | 0.2 | 27.6 | ||||||||||||||||
| Rottnest Island | - | - | - | - | - | - | - | - | - | - | 12.6 | - | - | 0.4 | 27.6 | - | - | - | 0.2 | - | - | - | - | - | - | 19.6 | - | - | 0.2 | - | - |
| Serpentine | - | - | - | 0.4 | 0.4 | - | - | - | - | - | 12.6 | 0.2 | - | - | 20.6 | - | - | - | - | - | - | - | - | - | 17.8 | 0.2 | - | - | - | - | |
| Swanbourne | - | - | - | 1.0 | - | - | - | - | - | - | 9.0 | - | - | 0.8 | 27.4 | - | - | - | - | - | - | - | - | - | - | 26.6 | - | - | - | - | - |
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 11 am on Tuesday 2 April 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, 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 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.
Further information
Western Australia Climate Services CentreBureau of Meteorology
Phone (08) 9263 2222
Email climatedata@bom.gov.au
