Thursday, 31 January 2013 - Monthly Climate Summary for Perth - Product code IDCKGC11L0
Perth in January 2013: Warm January nights
- Rainfall: near average to above average
- Maximum temperature: near average
- Minimum temperature: above average
Details Extremes Records Summaries Important notes the top
Rainfall
Rainfall across the Perth metropolitan area during January 2013 was near average to above average. Monthly rainfall totals for most sites were between 5 mm and 10 mm, however rainfall totals in the hills were closer to 20 mm.
Light showers with falls generally less than 1 mm were observed in the Perth area in the late evening on the 1st as a tropical low, the remnants of tropical cyclone Mitchell, dissipated off the southwest coast. A trough near the west coast produced showers across the Perth metropolitan area on the 6th, and showers and thunderstorms on the 7th, with falls during the event in the 5 mm to 10 mm range on the coastal plain and 10 mm to 20 mm in the hills. A cloudband associated tropical cyclone Narelle brought rain to the Perth metropolitan area on the afternoon of the 13th and morning of the 14th, though falls were generally less than 2 mm. Light showers were also observed as a weak cold front moved through the Perth region on the afternoon and evening of the 16th with rainfall totals mostly less than 3 mm.
Perth Metro recorded 7.2 mm of rainfall on 5 rain days in January 2013, close to the long-term average of 9.7 mm. The highest daily rainfall at Perth Metro during January 2013 was 4.8 mm on the 7th. It was Perth Metro's driest January for three years, since no measurable rainfall was recorded in January 2010.
Maximum temperature
Mean maximum temperatures in January 2013 across the Perth metropolitan area were near average. Mean maxima were in the high twenties on the offshore islands and in the low thirties on the coastal plain and in the hills.
After a record equalling seven day heatwave to end December, with the hottest day of December occurring at most metropolitan sites on 31 December, January 2013 began with a cooler change and mild to warm days up to the 4th with temperatures in the mid-twenties to low thirties. A relatively hot spell occurred from the 5th to 8th as temperatures were in the mid-to-high thirties at most sites, with the 8th being the hottest day of the month for most sites. Daily maxima over 37 °C were reported across the coastal plain and in the hills, and 41.1 °C at Pearce RAAF was the highest temperature recorded in the Perth metropolitan area in January 2013. A pattern of a mild to warm days interspersed with a hot day or two was observed for the remainder of the month after the 8th, with a hot day for most sites on the 14th, whilst the the lowest maximum temperature at all sites was recorded on the 17th with maxima typically in the mid-twenties.
Perth Metro's mean daily maximum temperature in January was 31.7 °C, which is close to the average of 31.0 °C. Daily maxima at Perth Metro ranged from a very hot 39.1 °C on the 8th to a mild 24.5 °C on the 17th. The mean maximum temperature for summer 2012-13 so far (December 2012 - January 2013) is 31.5 °C, which is the equal third highest mean maximum temperature for the December - January period since records commenced at Perth Metro in 1897.
Minimum temperature
Mean minimum temperatures in January 2013 were above average across the Perth metropolitan area, with mean minima generally in the mid-teens in the hills, the high teens on the coastal plain, and near 20 °C on the offshore islands.
The first two days of January 2013 saw warm overnight conditions for most sites, with minima in the low-to-mid twenties, whilst consecutive warm to hot nights were experienced between the 6th and 9th, and 13th and 16th. The islands recorded their warmest night of the month on the 7th-8th, however the 14th-15th was the hottest night of the month across most of Perth, with daily minima in the mid-to-high twenties. Perth Airport recorded its hottest January night in 69 years of record with a daily minimum temperature of 27.8 °C on the 15th, exceeding its previous record of 27.3 °C set on 21 January 1989. Gosnells City recorded a minimum temperature of 29.0 °C, which was the highest overnight temperature of the month in the Perth area, and the equal highest January minimum at Gosnells City in its 20 years of record. Apart from a relatively warm night on the 26th-27th, mostly mild nights were experienced throughout the second half of January 2012. The coolest mornings of the month were reported on both the 5th when inland sites on the coastal plain recorded minima in the 12 °C to 14 °C range, and the 18th as coastal, offshore islands, and hills sites recorded their lowest temperatures of the month. Minima in the mid-teens were reported at coastal and offshore sites on the 18th, whilst Bickley in the hills recorded the lowest temperature in the Perth Metropolitan area during January of 10.9 °C on the 18th.
Perth Metro's mean daily minimum temperature in January 2013 was 19.3 °C, which was well above the long-term mean of 18.0 °C. Daily minima ranged from a mild 14.0 °C on the 5th to a very warm 27.3 °C on the 15th. It was Perth Metro's third consecutive January with a mean minimum over 19 °C, a mean that had not been achieved at the Mt Lawley site in January in its 17 previous years of monitoring.
Sunshine
The mean daily sunshine hours for January 2013 was 11.2 hours, which is near the average of 11.5 hours.
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 January 2013 | |
|---|---|
| Hottest day | 41.1 °C at Pearce RAAF on the 8th |
| Warmest days on average | 34.0 °C at Pearce RAAF |
| Coolest days on average | 27.0 °C at Rottnest
Island 30.3 °C at Bickley |
| Coldest day | 21.7 °C at Garden
Island HSF on the 17th 23.6°C at Bickley on the 17th |
| Coldest night | 10.9 °C at Bickley on the 18th |
| Coolest nights on average | 16.4 °C at Bickley |
| Warmest nights on average | 20.0 °C at Garden
Island HSF 19.5 °C at Champion Lakes |
| Warmest night | 29.0 °C at Gosnells City on the 15th |
| Wettest overall | 24.6 mm at Jarrahdale |
| Wettest day | 17.4 mm at Jarrahdale on the 7th |
| Highest wind gust | 80 km/h at Rottnest Island on the 17th |
Extremes Records Summaries Important notes the top
| Record highest January daily minimum temperature | ||||||
|---|---|---|---|---|---|---|
| Highest daily minimum temperature in January 2013 (°C) |
Previous warmest for January |
Years of record |
Average for January |
|||
| Perth Airport | 27.8 | on the 15th | 27.3 | on the 21st in 1989 | 69 | 17.0 |
| Gosnells City | 29.0 | on the 15th | = 29.0 | on the 28th in 2012 | 20 | 18.5 |
Extremes Records Summaries Important notes the top
| Summary statistics for January 2013 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperatures for January (°C) |
Minimum temperatures for January (°C) |
Rainfall for January (millimetres) |
||||||||||
| Mean for January 2013 |
Diff from average |
Highest for January 2013 |
Mean for January 2013 |
Diff from average |
Lowest for January 2013 |
Total for January 2013 |
Average for January |
Rank of January 2013 |
Fraction of January average |
|||
| Bickley | 30.3 | -0.3 | 38.2 | 8th | 16.4 | +1.1 | 10.9 | 18th | 17.2 | 18.0 | average | 96% |
| Champion Lakes | 31.5 | 38.8 | 8th | 19.5 | 14.1 | 18th | 8.2 | |||||
| Garden Island HSF | 27.1 | -0.2 | 33.5 | 14th | 20.0 | +1.2 | 15.1 | 18th | 4.6 | 11.0 | average | 42% |
| Gosnells City | 33.2 | +0.1 | 39.9 | 8th | 1.2 | 12.0 | average | 10% | ||||
| Jandakot Aero | 31.5 | +0.2 | 38.3 | 8th | 18.3 | +1.6 | 12.1 | 5th | 6.4 | 14.4 | high | 44% |
| Pearce RAAF | 34.0 | +0.5 | 41.1 | 8th | 18.2 | +1.2 | 12.6 | 5th | 8.8 | 7.8 | high | 113% |
| Perth Airport | 32.2 | +0.5 | 39.4 | 8th | 18.5 | +1.5 | 12.7 | 5th | 7.4 | 9.7 | average | 76% |
| Perth Metro | 31.7 | +0.6 | 39.1 | 8th | 19.3 | +1.3 | 14.0 | 5th | 7.2 | 9.7 | average | 74% |
| Rottnest Island | 27.0 | +0.6 | 33.1 | 7th | 20.0 | +0.9 | 15.6 | 18th | 6.6 | 7.8 | high | 84% |
| Swanbourne | 30.7 | +1.0 | 37.6 | 8th | 19.1 | +1.0 | 14.1 | 18th | ||||
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 | 31.3 | 28.0 | 24.8 | 24.8 | 36.0 | 29.3 | 32.9 | 38.2 | 27.2 | 26.0 | 29.7 | 31.0 | 25.6 | 35.1 | 32.6 | 24.7 | 23.6 | 27.0 | 30.9 | 34.1 | 33.1 | 34.0 | 29.2 | 29.1 | 31.0 | 33.2 | 32.8 | 29.3 | 30.8 | 32.4 | |
| Champion Lakes | 29.6 | 28.3 | 25.5 | 26.1 | 37.2 | 33.4 | 37.5 | 38.8 | 27.4 | 26.3 | 31.5 | 33.6 | 28.3 | 36.2 | 32.2 | 25.9 | 24.8 | 29.6 | 32.7 | 34.3 | 33.6 | 35.8 | 29.5 | 30.1 | 32.3 | 34.4 | 34.4 | 31.5 | 31.9 | 33.1 | |
| Garden Island HSF | 28.9 | 25.6 | 25.8 | 23.6 | 27.4 | 33.3 | 31.7 | 31.2 | 23.3 | 22.9 | 24.9 | 31.7 | 29.3 | 33.5 | 30.3 | 26.6 | 21.7 | 25.8 | 29.3 | 25.8 | 24.6 | 26.1 | 23.8 | 23.3 | 25.8 | 28.4 | 27.2 | 30.1 | 25.8 | 25.2 | |
| Gosnells City | 32.2 | 28.0 | 38.5 | 35.0 | 38.2 | 39.9 | 28.9 | 27.9 | 32.0 | 35.0 | 33.3 | 37.8 | 34.4 | 27.8 | 25.8 | 30.5 | 34.0 | 36.2 | 35.0 | 37.0 | 31.2 | 30.7 | 33.0 | 35.5 | 32.8 | 33.2 | 34.3 | ||||
| Jandakot Aero | 30.8 | 27.9 | 26.9 | 26.0 | 35.6 | 34.0 | 38.2 | 38.3 | 27.3 | 26.5 | 29.6 | 35.0 | 28.3 | 36.3 | 32.7 | 27.3 | 24.7 | 30.0 | 32.8 | 33.7 | 32.3 | 35.3 | 29.0 | 28.6 | 30.4 | 34.4 | 35.6 | 32.6 | 31.6 | 32.3 | |
| Pearce RAAF | 36.9 | 31.4 | 29.6 | 28.2 | 39.8 | 34.3 | 37.8 | 41.1 | 29.7 | 28.9 | 32.3 | 35.4 | 28.0 | 39.0 | 36.9 | 31.3 | 27.2 | 30.4 | 34.4 | 37.8 | 35.6 | 37.4 | 31.7 | 31.9 | 34.5 | 36.7 | 36.5 | 33.0 | 35.5 | 35.7 | |
| Perth Airport | 32.0 | 28.6 | 26.9 | 26.1 | 37.9 | 34.1 | 37.7 | 39.4 | 28.2 | 27.4 | 30.4 | 34.2 | 28.5 | 37.4 | 33.7 | 27.6 | 26.0 | 30.1 | 33.8 | 35.9 | 32.9 | 36.1 | 29.7 | 29.7 | 32.1 | 35.4 | 36.2 | 32.4 | 32.8 | 34.1 | |
| Perth Metro | 30.8 | 28.5 | 27.3 | 25.6 | 36.9 | 35.3 | 37.8 | 39.1 | 26.4 | 26.2 | 29.4 | 34.9 | 28.1 | 37.3 | 32.6 | 27.1 | 24.5 | 30.2 | 33.2 | 35.1 | 31.5 | 35.7 | 28.7 | 28.4 | 30.8 | 34.9 | 34.5 | 32.5 | 32.7 | 32.3 | |
| Rottnest Island | 28.2 | 25.8 | 26.0 | 24.2 | 28.3 | 33.0 | 33.1 | 31.7 | 24.3 | 24.4 | 24.9 | 28.8 | 27.1 | 32.1 | 28.7 | 25.7 | 23.3 | 24.9 | 27.2 | 27.0 | 25.4 | 26.2 | 25.0 | 23.9 | 25.9 | 28.7 | 26.8 | 27.0 | 27.5 | 25.3 | |
| Swanbourne | 29.0 | 27.4 | 27.7 | 26.6 | 35.9 | 34.9 | 36.1 | 37.6 | 26.2 | 26.2 | 28.4 | 35.5 | 29.6 | 33.4 | 30.8 | 26.6 | 25.2 | 29.2 | 33.8 | 30.8 | 28.0 | 33.7 | 26.7 | 27.1 | 31.0 | 34.6 | 33.9 | 33.0 | 32.8 | 30.0 | |
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 | 22.8 | 18.3 | 15.4 | 13.1 | 14.5 | 23.2 | 21.6 | 21.8 | 18.6 | 12.7 | 13.1 | 16.4 | 18.7 | 19.0 | 24.2 | 19.7 | 15.0 | 10.9 | 12.9 | 16.9 | 15.5 | 14.2 | 18.1 | 13.6 | 12.0 | 15.0 | 16.4 | 12.9 | 13.8 | 15.9 | 13.5 |
| Champion Lakes | 26.0 | 21.6 | 17.7 | 15.9 | 16.4 | 23.4 | 24.0 | 25.3 | 21.6 | 15.9 | 16.1 | 19.7 | 22.3 | 21.7 | 27.4 | 22.9 | 19.1 | 14.1 | 16.7 | 20.0 | 19.4 | 18.2 | 18.1 | 16.3 | 15.9 | 18.7 | 20.3 | 16.6 | 17.9 | 18.9 | 17.4 |
| Garden Island HSF | 24.4 | 21.3 | 20.6 | 19.0 | 18.4 | 22.3 | 23.3 | 24.9 | 21.6 | 17.8 | 17.4 | 19.5 | 22.1 | 23.3 | 24.5 | 22.5 | 19.8 | 15.1 | 17.2 | 17.7 | 19.5 | 17.8 | 21.5 | 18.7 | 16.5 | 18.7 | 20.6 | 16.9 | 18.6 | 19.6 | 17.4 |
| Gosnells City | 26.2 | 17.0 | 23.7 | 24.5 | 21.6 | 15.2 | 15.8 | 20.0 | 22.0 | 21.3 | 29.0 | 21.3 | 18.6 | 13.8 | 15.7 | 18.2 | 19.0 | 16.5 | 18.1 | 18.8 | 17.2 | ||||||||||
| Jandakot Aero | 25.1 | 21.4 | 15.8 | 17.1 | 12.1 | 21.3 | 23.9 | 24.9 | 21.7 | 12.3 | 14.4 | 19.5 | 21.8 | 21.3 | 26.5 | 22.7 | 18.8 | 13.5 | 16.3 | 14.1 | 17.1 | 17.5 | 16.9 | 14.1 | 15.5 | 13.9 | 20.1 | 16.2 | 16.1 | 17.3 | 16.9 |
| Pearce RAAF | 24.4 | 21.4 | 15.5 | 15.3 | 12.6 | 21.3 | 23.6 | 25.3 | 21.6 | 14.4 | 15.2 | 20.3 | 21.9 | 21.5 | 25.3 | 21.3 | 17.6 | 14.5 | 16.3 | 14.0 | 14.4 | 18.2 | 15.3 | 14.2 | 16.9 | 14.2 | 21.0 | 17.0 | 17.8 | 14.0 | 17.5 |
| Perth Airport | 24.3 | 21.7 | 16.2 | 14.2 | 12.7 | 21.2 | 23.4 | 25.3 | 22.3 | 13.0 | 16.0 | 20.2 | 22.1 | 21.8 | 27.8 | 21.0 | 19.0 | 14.2 | 16.5 | 13.8 | 18.6 | 18.0 | 17.3 | 14.3 | 16.1 | 13.8 | 20.1 | 16.5 | 17.8 | 17.2 | 17.1 |
| Perth Metro | 25.1 | 21.6 | 18.9 | 18.3 | 14.0 | 22.0 | 24.0 | 25.2 | 22.3 | 15.6 | 16.7 | 20.4 | 22.2 | 21.7 | 27.3 | 22.8 | 19.1 | 15.1 | 16.6 | 15.4 | 19.4 | 18.1 | 20.0 | 17.2 | 16.1 | 15.4 | 20.6 | 16.8 | 17.8 | 16.8 | 17.2 |
| Rottnest Island | 23.0 | 20.8 | 19.3 | 18.3 | 19.2 | 22.3 | 23.2 | 24.5 | 20.8 | 19.4 | 18.2 | 19.9 | 22.0 | 22.0 | 23.5 | 21.6 | 18.6 | 15.6 | 17.6 | 20.2 | 19.8 | 18.2 | 20.7 | 18.9 | 17.3 | 19.8 | 21.4 | 17.7 | 19.0 | 20.8 | 17.9 |
| Swanbourne | 24.2 | 21.1 | 19.3 | 18.4 | 14.7 | 21.4 | 23.3 | 24.3 | 21.6 | 15.6 | 15.9 | 19.9 | 22.0 | 21.1 | 24.7 | 22.2 | 18.9 | 14.1 | 16.8 | 17.5 | 18.1 | 17.2 | 20.0 | 16.4 | 16.2 | 18.2 | 20.1 | 17.0 | 17.1 | 18.7 | 17.4 |
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 |
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 | - | 0.4 | - | - | - | - | 11.4 | 1.0 | - | - | - | - | - | 1.6 | - | - | 2.8 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Champion Lakes | - | - | - | - | - | - | 5.2 | 0.2 | - | - | - | - | - | 1.6 | 0.2 | - | 1.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Garden Island HSF | - | - | - | - | - | - | 4.4 | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Gosnells City | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||
| Jandakot Aero | - | 0.2 | - | - | - | - | 3.8 | 0.2 | - | - | - | - | - | 1.6 | - | - | 0.6 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Jarrahdale | - | 0.6 | 0.2 | - | - | - | 17.4 | 0.6 | - | - | - | - | - | 2.8 | - | - | 3.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Pearce RAAF | - | - | - | - | - | - | 4.2 | - | - | - | - | - | - | 4.4 | - | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Perth Airport | - | - | - | - | - | - | 6.6 | 0.4 | - | - | - | - | - | 0.4 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Perth Metro | - | 0.4 | - | - | - | - | 4.8 | 0.2 | - | - | - | - | - | 1.2 | - | - | 0.6 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Roleystone | - | 0.2 | - | - | - | 0.2 | 8.6 | 1.0 | - | - | - | - | - | 0.8 | - | - | 2.6 | ||||||||||||||
| Rottnest Island | - | - | - | - | - | - | 6.4 | - | - | - | - | - | - | - | - | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Serpentine | - | - | - | - | - | - | 14.6 | - | - | - | - | - | - | 1.2 | - | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Swanbourne | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
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 Thursday 31 January 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
