Tuesday, 6 January 2015 - Monthly Climate Summary for Perth - Product code IDCKGC11L0
Perth in December 2014: Dry and mild
December 2014 was very dry across the Perth metropolitan area, with most sites recording little or no rainfall. The highest monthly total was 4.8 mm at Jarrahdale in the southern Perth hills. It was a rainless month at Perth Metro, the seventh year since records commenced in 1876 that Perth Metro has recorded no rainfall in December, and the driest December for five years, since no rainfall was recorded in December 2009.
Mean maximum temperatures for December were below average for most sites, with days mostly mild to warm for the first half of the month, whilst maximum temperatures were mostly in the low thirties in the second half of the month. Hot days were recorded on the 11th, 19th, 23rd to 27th, 29th and 30th for coastal plain and hills sites, and a daily maximum temperature of 43.4 °C at Pearce RAAF on the 30th was the highest temperature of the month in the Perth area. Perth Metro recorded a mean maximum temperature of 28.9 °C, which is just below the long-term average of 29.1 °C, and the mildest December for six years, since 2008, when a mean maximum temperature of 27.8 °C was recorded.
Mean minimum temperatures were generally below average across the Perth region in December 2014. Most nights were cool to cold with minima commonly in the 11 °C to 17 °C temperature range. Cold nights with daily minima below 10 °C were experienced at some coastal plain sites on the 14th and 16th, whilst Bickley in the Perth hills recorded four cold nights on the 9th and 10th, and 16th and 17th. A daily minimum temperature of 8.9 °C at Pearce RAAF on the 16th and at Bickley on the 17th was the lowest temperature of the month in the Perth Metropolitan area. Perth Metro recorded a mean minimum temperature of 15.8 °C, which is below the long-term average of 16.4 °C, and the coolest December for six years, since 2008, when a mean minimum of 15.6 °C was recorded.
- A fire at Whiteman Park in the northern Perth suburbs burnt 367 hectares of bushland on 14 December.
Extremes Records Summaries Daily observations Important notes the top
Further information
- Media
- media@bom.gov.au (03) 9669 4057
- Enquiries
- helpdesk.climate@bom.gov.au
| Extremes in December 2014 | |
|---|---|
| Hottest day | 43.4 °C at Pearce RAAF on the 30th |
| Warmest days on average | 31.1 °C at Pearce RAAF |
| Coolest days on average |
24.6 °C at Rottnest Island 27.7 °C at Bickley |
| Coldest day |
19.9 °C at Garden Island HSF on the 16th 20.9 °C at Bickley on the 15th |
| Coldest night |
8.9 °C at Pearce RAAF on the 16th 8.9 °C at Bickley on the 17th |
| Coolest nights on average | 13.1 °C at Bickley |
| Warmest nights on average |
17.2 °C at Rottnest Island 15.8 °C at Perth Metro |
| Warmest night | 23.6 °C at Gosnells City on the 20th |
| Warmest on average overall | 22.7 °C at Gosnells City |
| Coolest on average overall | 20.4 °C at Bickley |
| Wettest overall | 4.8 mm at Jarrahdale |
| Wettest day | 4.4 mm at Jarrahdale on the 2nd |
| Strongest wind gust | 83 km/h at Rottnest Island on the 12th |
Extremes Records Summaries Daily observations Important notes the top
Extremes Records Summaries Daily observations Important notes the top
| Summary statistics for December 2014 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperatures (°C) |
Minimum temperatures (°C) |
Rainfall (millimetres) |
||||||||||
| Mean for December 2014 |
Diff from average |
Highest for December 2014 |
Mean for December 2014 |
Diff from average |
Lowest for December 2014 |
Total for December 2014 |
Average for December |
Rank of December 2014 |
Fraction of December average |
|||
| Bickley | 27.7 | -0.4 | 38.0 | 30th | 13.1 | -0.6 | 8.9 | 17th | 0.2 | 13.1 | v low | 2% |
| Garden Island HSF | 24.9 | -0.6 | 32.5 | 29th | 16.7 | -0.5 | 13.5 | 2nd | 0.2 | 11.6 | v low | 2% |
| Gosnells City | 29.9 | -0.6 | 40.5 | 30th | 15.7 | -0.6 | 11.4 | 9th | 0.1 | 11.4 | low | 1% |
| Jandakot Aero | 29.0 | -0.1 | 38.5 | 30th | 14.0 | -0.7 | 9.1 | 16th | 0 | 10.5 | lowest | 0% |
| Pearce RAAF | 31.1 | +0.8 | 43.4 | 30th | 13.9 | -0.6 | 8.9 | 16th | 0 | 10.4 | lowest | 0% |
| Perth Airport | 29.7 | +0.7 | 41.5 | 30th | 14.9 | 0.0 | 10.4 | 14th | 0.2 | 11.1 | v low | 2% |
| Perth Metro | 28.9 | -0.2 | 39.3 | 30th | 15.8 | -0.6 | 11.6 | 14th | 0 | 13.3 | lowest | 0% |
| Rottnest Island | 24.6 | -0.5 | 31.3 | 27th | 17.2 | -0.4 | 13.8 | 10th | 0 | 10.0 | lowest | 0% |
| Swanbourne | 28.1 | +0.1 | 38.8 | 19th | 15.7 | -0.8 | 11.9 | 14th | 0.2 | 11.8 | low | 2% |
Extremes Records Summaries Daily observations Important notes the top
| Daily maximum temperatures for December 2014 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 21.2 | 24.7 | 25.2 | 24.9 | 21.3 | 27.8 | 29.8 | 23.7 | 22.5 | 25.0 | 31.2 | 25.2 | 26.9 | 27.2 | 20.9 | 23.2 | 25.1 | 29.8 | 37.8 | 28.0 | 27.4 | 27.6 | 28.8 | 29.6 | 28.7 | 30.4 | 32.3 | 31.1 | 33.8 | 38.0 | 28.9 |
| Garden Island HSF | 23.4 | 22.6 | 24.4 | 21.3 | 22.3 | 24.0 | 23.0 | 21.2 | 20.2 | 26.0 | 29.4 | 21.2 | 20.5 | 20.9 | 22.2 | 19.9 | 22.4 | 29.6 | 32.0 | 24.6 | 23.5 | 22.9 | 29.3 | 26.6 | 28.2 | 28.7 | 31.1 | 26.3 | 32.5 | 27.2 | 23.3 |
| Gosnells City | 24.1 | 26.5 | 27.2 | 26.5 | 25.0 | 29.5 | 31.0 | 26.0 | 24.4 | 34.0 | 26.5 | 28.2 | 28.0 | 23.7 | 26.4 | 25.2 | 31.8 | 38.9 | 30.6 | 30.5 | 30.2 | 32.6 | 33.6 | 34.1 | 35.1 | 32.5 | 35.2 | 40.5 | 30.7 | ||
| Jandakot Aero | 24.1 | 25.7 | 26.0 | 25.1 | 24.4 | 29.0 | 29.2 | 25.0 | 24.7 | 28.1 | 32.6 | 25.8 | 26.6 | 26.2 | 24.2 | 23.6 | 24.2 | 30.9 | 37.8 | 28.4 | 29.2 | 29.0 | 32.3 | 32.8 | 32.6 | 33.6 | 34.9 | 31.1 | 33.8 | 38.5 | 29.1 |
| Medina Research Centre | 24.6 | 24.8 | 26.3 | 23.7 | 25.0 | 27.0 | 28.2 | 23.6 | 23.9 | 28.1 | 32.7 | 24.0 | 26.0 | 25.4 | 23.3 | 22.5 | 25.1 | 32.6 | |||||||||||||
| Pearce RAAF | 26.2 | 28.0 | 28.8 | 26.7 | 26.5 | 31.3 | 32.2 | 27.3 | 25.4 | 29.0 | 35.6 | 27.7 | 28.7 | 30.7 | 25.4 | 26.8 | 26.8 | 33.2 | 41.0 | 29.4 | 31.1 | 31.9 | 33.1 | 33.3 | 32.6 | 34.3 | 37.0 | 34.2 | 37.4 | 43.4 | 30.2 |
| Perth Airport | 24.7 | 27.4 | 27.3 | 26.1 | 24.9 | 29.3 | 31.0 | 25.3 | 25.9 | 27.9 | 34.0 | 26.6 | 26.4 | 27.5 | 23.6 | 24.5 | 25.0 | 31.9 | 39.2 | 28.7 | 29.6 | 30.0 | 32.1 | 32.6 | 31.9 | 33.4 | 35.0 | 31.3 | 35.7 | 41.5 | 29.6 |
| Perth Metro | 24.6 | 26.3 | 26.9 | 25.0 | 24.5 | 29.2 | 30.2 | 24.7 | 23.6 | 27.1 | 33.4 | 24.7 | 24.9 | 27.1 | 23.7 | 24.2 | 23.8 | 30.2 | 38.6 | 26.9 | 28.8 | 29.3 | 32.6 | 32.4 | 32.0 | 33.5 | 34.9 | 30.6 | 34.4 | 39.3 | 27.5 |
| Rottnest Island | 23.7 | 22.8 | 23.5 | 23.0 | 22.9 | 23.8 | 24.6 | 22.9 | 21.5 | 24.2 | 29.4 | 22.9 | 21.4 | 21.8 | 22.9 | 21.3 | 21.6 | 26.2 | 30.7 | 23.6 | 23.6 | 23.6 | 26.9 | 25.2 | 25.7 | 26.4 | 31.3 | 24.7 | 26.3 | 31.1 | 24.0 |
| Swanbourne | 24.3 | 26.3 | 25.3 | 24.1 | 26.1 | 26.0 | 26.6 | 25.1 | 22.6 | 27.4 | 32.9 | 24.4 | 23.3 | 23.8 | 24.4 | 23.1 | 23.4 | 30.8 | 38.8 | 25.8 | 27.5 | 27.0 | 34.4 | 31.8 | 33.3 | 33.4 | 33.5 | 28.1 | 34.8 | 37.0 | 26.0 |
|
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 December 2014 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 13.5 | 10.0 | 12.7 | 10.6 | 12.2 | 12.5 | 14.8 | 14.6 | 9.3 | 9.2 | 13.0 | 16.7 | 10.4 | 11.4 | 10.6 | 9.3 | 8.9 | 11.8 | 15.7 | 21.1 | 12.7 | 12.7 | 12.3 | 12.6 | 11.7 | 10.7 | 14.9 | 15.8 | 16.9 | 20.7 | 15.9 |
| Garden Island HSF | 18.3 | 13.5 | 14.6 | 16.3 | 15.8 | 16.1 | 17.9 | 18.9 | 14.2 | 13.5 | 16.9 | 19.5 | 15.1 | 15.5 | 15.9 | 14.7 | 14.6 | 15.0 | 17.0 | 20.3 | 16.8 | 16.0 | 16.3 | 16.5 | 15.8 | 14.9 | 18.6 | 19.2 | 19.9 | 21.8 | 19.1 |
| Gosnells City | 16.5 | 13.4 | 15.5 | 12.5 | 16.0 | 13.3 | 15.9 | 16.5 | 11.4 | 13.0 | 15.2 | 12.0 | 13.5 | 13.0 | 11.5 | 11.6 | 15.2 | 17.5 | 23.6 | 16.5 | 16.1 | 14.9 | 20.0 | 19.4 | 19.8 | 22.8 | 17.8 | ||||
| Jandakot Aero | 17.4 | 13.0 | 10.5 | 10.5 | 15.5 | 11.7 | 12.4 | 15.5 | 10.0 | 10.9 | 16.5 | 14.5 | 10.1 | 10.4 | 13.1 | 9.1 | 10.4 | 14.4 | 14.8 | 20.7 | 14.6 | 15.3 | 15.8 | 16.1 | 15.3 | 14.3 | 14.9 | 14.0 | 17.7 | 18.4 | 17.2 |
| Medina Research Centre | 17.6 | 12.4 | 11.2 | 12.0 | 14.6 | 13.0 | 13.3 | 15.4 | 11.1 | 10.0 | 16.4 | 17.0 | 11.5 | 9.5 | 14.1 | 11.2 | 11.5 | 13.7 | 14.9 | ||||||||||||
| Pearce RAAF | 15.6 | 14.0 | 10.5 | 11.5 | 16.4 | 11.0 | 11.3 | 16.6 | 10.2 | 12.2 | 17.3 | 12.5 | 11.4 | 10.9 | 13.6 | 8.9 | 10.5 | 11.4 | 14.2 | 18.7 | 13.9 | 16.4 | 16.0 | 16.6 | 15.7 | 13.5 | 14.8 | 18.0 | 18.1 | ||
| Perth Airport | 17.5 | 14.0 | 11.7 | 11.5 | 15.8 | 11.8 | 12.7 | 17.5 | 11.2 | 12.7 | 16.8 | 16.6 | 12.0 | 10.4 | 12.0 | 10.7 | 12.1 | 15.1 | 15.1 | 21.3 | 15.9 | 16.1 | 15.9 | 16.4 | 15.3 | 14.5 | 16.9 | 18.3 | 16.2 | 19.1 | 18.1 |
| Perth Metro | 17.8 | 14.3 | 13.1 | 13.6 | 16.2 | 14.2 | 14.7 | 18.1 | 12.7 | 13.0 | 16.8 | 18.7 | 13.0 | 11.6 | 15.1 | 12.7 | 13.2 | 15.7 | 15.4 | 20.6 | 16.3 | 16.5 | 16.1 | 16.8 | 15.4 | 14.9 | 16.8 | 17.6 | 19.1 | 19.6 | 19.2 |
| Rottnest Island | 17.7 | 14.2 | 17.1 | 16.9 | 16.5 | 17.8 | 18.8 | 18.0 | 15.0 | 13.8 | 16.9 | 18.8 | 15.4 | 16.3 | 16.8 | 15.2 | 15.7 | 16.3 | 18.8 | 19.6 | 16.8 | 17.2 | 16.6 | 17.3 | 16.6 | 15.8 | 18.7 | 19.5 | 19.4 | 20.6 | 18.8 |
| Swanbourne | 17.4 | 13.7 | 14.1 | 14.2 | 16.0 | 14.8 | 15.5 | 18.1 | 12.2 | 12.0 | 16.7 | 18.9 | 12.5 | 11.9 | 14.9 | 12.1 | 12.6 | 14.4 | 16.3 | 20.3 | 15.0 | 16.4 | 16.1 | 17.0 | 15.9 | 14.8 | 19.0 | 17.2 | 18.6 | 19.8 | 19.5 |
|
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 |
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| Daily rainfall for December 2014 | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | - | - | - | - | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Garden Island HSF | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Gosnells City | - | - | - | - | - | 0.1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Jandakot Aero | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Jarrahdale | - | 4.4 | - | - | - | 0.2 | - | - | - | - | - | - | - | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Medina Research Centre | - | - | - | - | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | |||||||||||||
| Mundaring | - | - | - | - | 0.4 | |||||||||||||||||||||||||||
| Pearce RAAF | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |||
| Perth Airport | - | - | - | - | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Perth Metro | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Roleystone | - | 0.5 | ||||||||||||||||||||||||||||||
| Rottnest Island | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Serpentine | - | 1.4 | - | - | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Swanbourne | - | - | - | - | - | 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 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 | ||||||||||||||||||
Extremes Records Summaries Daily observations 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.
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 Tuesday 6 January 2015. 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
- media@bom.gov.au (03) 9669 4057
- Enquiries
- helpdesk.climate@bom.gov.au
