Friday, 8 January 2021 - Monthly Climate Summary for Greater Perth - Product code IDCKGC11L0
Greater Perth in December 2020: very warm with a scorching Christmas Day
December 2020 was very warm across Greater Perth, and it was the second-warmest December on record at the Perth Metro site. Mean maximum temperatures were well above average, with a mild start to the month and a hot spell to Christmas Day. Mean minimum temperatures were also above average.
Below average rainfall
- Rainfall was below average across Greater Perth, and monthly totals were mostly less than 5 mm although December is typically dry.
- A number of weak cold fronts produced light rainfall on the 1st,13th and 14th.
Well above average daytime temperatures
- Mean maximum temperatures were 1–3 °C above average across Greater Perth; mean minimum temperatures were 0.5–2 °C above average for most sites.
- Perth Metro recorded a mean maximum temperature of 31.7 °C, which was its second-warmest December on record, behind 2019.
- It was the equal second-warmest December on record at Perth Airport with a mean maximum temperature of 32.4 °C, equal with 1999 and behind 2019.
- The first December morning was the coldest of the month, with minimum temperatures generally below 10 °C; Perth Metro recorded a minimum of 6.6 °C on the 1st, its lowest December temperature on record.
- Perth Metro (along with several other sites) recorded 3 consecutive days with temperatures of 40 °C leading to a scorching Christmas Day, which was its second hot spell in December, and the first was between 13 and 15 December in 2019.
- Perth Metro recorded a maximum temperature of 40.4 °C on the 25th, which was its hottest Christmas Day for 13 years when a maximum of 40.7 °C was recorded on 25 December 2007.
Perth Metro
- Total rainfall for Perth Metro was 4.4 mm, which is 42% of the long-term average of 10.4 mm
- The mean daily maximum temperature for Perth Metro was 31.7 °C, which is 2.4 °C above the long-term average of 29.3 °C
- The warmest day was 41.1 °C on the 24th, and the coolest day was on the 13th when the temperature reached 23.1 °C
- The mean daily minimum temperature for Perth Metro was 16.9 °C, which is 0.5 °C above the long-term average of 16.4 °C
- The coldest morning was 6.6 °C on the 1st, and the warmest morning was on the 30th when the minimum temperature was 24.1 °C
Further information
- Media
- media@ (03) 9669 4057
Extremes Maps Records Summaries Daily observations Important notes the top
| Extremes in December 2020 | |
|---|---|
| Hottest day | 42.6 °C at Pearce RAAF on the 24th |
| Warmest days on average | 33.4 °C at Pearce RAAF |
| Coolest days on average | 26.5 °C at Rottenest Island |
| Coldest day | 19.6 °C at Karney on the 13th |
| Coldest night | 4.8 °C at Karney on the 1st |
| Coolest nights on average |
14.3 °C at Buckley 14.3 °C at Karnet |
| Warmest nights on average | 17.9 °C at Rottnest Island |
| Warmest night |
26.2 °C at Gosnells City on the 30th 26.2 °C at Pearce RAAF on the 30th |
| Warmest on average overall | 25.0 °C at Pearce RAAF |
| Coolest on average overall |
22.2 °C at Bickley 22.2 °C at Rottnest Island |
| Wettest overall | 10.6 mm at Bickley |
| Driest overall | 0.2 mm at Garden Island HSF |
| Wettest day | 6.4 mm at Bickley on the 13th |
| Strongest wind gust | 80 km/h at Rottnest Island on the 26th |
Extremes Maps Records Summaries Daily observations Important notes the top
| Record lowest December temperature | ||||||
|---|---|---|---|---|---|---|
|
New record (°C) |
Old record |
Years of record |
Average for December |
|||
| Gosnells City | 8.0 | on the 1st | = 8.0 | on the 2nd in 2002 | 29 | 16.4 |
| Perth Metro | 6.6 | on the 1st | 7.9 | on the 7th in 2007 | 27 | 16.4 |
Extremes Maps Records Summaries Daily observations Important notes the top
| Summary statistics for December 2020 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperatures (°C) |
Minimum temperatures (°C) |
Rainfall (millimetres) |
||||||||||
| Mean for December 2020 |
Diff from average |
Highest for December 2020 |
Mean for December 2020 |
Diff from average |
Lowest for December 2020 |
Total for December 2020 |
Average for December |
Rank of December 2020 |
Fraction of December average |
|||
| Bickley | 30.0 | +1.8 | 39.1 | 25th | 14.3 | +0.5 | 6.5 | 1st | 10.6 | 14.5 | average | 73% |
| Garden Island HSF | 27.7 | +2.2 | 38.7 | 24th | 17.8 | +0.5 | 11.2 | 1st | 0.2 | 9.9 | lowest | 2% |
| Gosnells City | 32.6 | +2.1 | 40.5 | 23rd | 17.3 | +0.9 | 8.0 | 1st | 7.4 | 11.3 | average | 65% |
| Jandakot Aero | 31.6 | +2.4 | 41.2 | 24th | 16.2 | +1.4 | 5.0 | 1st | 2.2 | 10.4 | average | 21% |
| Karnet | 30.0 | +1.8 | 38.6 | 25th | 14.3 | +0.8 | 4.8 | 1st | 4.8 | 18.6 | low | 26% |
| Millendon (Swan Valley) | 32.8 | 42.2 | 24th | 16.3 | 6.2 | 1st | 2.0 | |||||
| Pearce RAAF | 33.4 | +2.9 | 42.6 | 24th | 16.7 | +2.1 | 5.4 | 1st | ||||
| Perth Airport | 32.4 | +3.3 | 41.7 | 24th | 16.4 | +1.4 | 4.9 | 1st | 4.0 | 11.1 | average | 36% |
| Perth Metro | 31.7 | +2.4 | 41.1 | 24th | 16.9 | +0.5 | 6.6 | 1st | 4.4 | 10.4 | average | 42% |
| Rottnest Island | 26.5 | +1.4 | 37.7 | 23rd | 17.9 | +0.2 | 12.8 | 1st | 1.4 | 10.5 | low | 13% |
| Swanbourne | 29.1 | +1.2 | 39.7 | 23rd | 17.6 | +1.0 | 9.0 | 1st | 2.8 | 10.9 | average | 26% |
Extremes Maps Records Summaries Daily observations Important notes the top
| Daily maximum temperatures for December 2020 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 21.8 | 26.2 | 30.0 | 21.3 | 23.4 | 25.5 | 30.1 | 37.2 | 32.5 | 33.3 | 29.0 | 30.7 | 19.8 | 22.0 | 26.6 | 28.7 | 28.2 | 30.0 | 32.1 | 30.5 | 30.2 | 33.9 | 37.6 | 38.9 | 39.1 | 32.9 | 26.4 | 30.9 | 36.3 | 34.2 | 31.1 |
| Garden Island HSF | 19.7 | 20.4 | 21.6 | 22.6 | 19.7 | 24.1 | 29.1 | 34.7 | 30.7 | 30.8 | 34.3 | 26.3 | 23.1 | 21.6 | 25.4 | 24.1 | 26.8 | 27.2 | 28.7 | 23.8 | 28.7 | 30.5 | 37.5 | 38.7 | 26.2 | 23.6 | 30.0 | 31.2 | 35.7 | 32.6 | 28.2 |
| Gosnells City | 24.6 | 28.5 | 31.0 | 25.2 | 27.5 | 33.5 | 39.5 | 37.1 | 32.3 | 33.1 | 23.7 | 24.5 | 30.4 | 30.6 | 31.5 | 32.6 | 35.0 | 34.0 | 33.8 | 37.0 | 40.5 | 40.2 | 35.7 | 29.7 | 34.0 | 39.6 | 34.6 | 33.2 | |||
| Jandakot Aero | 22.9 | 26.3 | 28.5 | 23.7 | 23.4 | 25.1 | 32.7 | 39.4 | 34.7 | 37.6 | 33.1 | 32.3 | 23.1 | 23.4 | 29.8 | 29.2 | 31.2 | 31.3 | 33.5 | 32.3 | 32.9 | 35.5 | 39.7 | 41.2 | 39.2 | 31.1 | 29.7 | 33.6 | 39.0 | 33.6 | 31.7 |
| Karnet | 25.3 | 29.4 | 20.4 | 22.7 | 25.4 | 29.8 | 36.1 | 30.5 | 33.6 | 29.2 | 30.1 | 19.6 | 23.3 | 26.4 | 28.5 | 28.5 | 29.6 | 31.5 | 29.2 | 30.1 | 34.2 | 37.2 | 38.6 | 38.6 | 32.1 | 25.6 | 30.3 | 35.6 | 35.2 | 31.9 | |
| Mandurah | 21.2 | 24.5 | 25.4 | 23.7 | 21.8 | 23.5 | 29.8 | 36.7 | 32.4 | 35.0 | 34.5 | 28.2 | 22.6 | 31.3 | 33.1 | 38.6 | 37.4 | 36.0 | 28.2 | 29.1 | 31.7 | 37.0 | 34.0 | 28.6 | |||||||
| Millendon (Swan Valley) | 25.3 | 29.4 | 31.9 | 24.9 | 25.1 | 27.5 | 33.2 | 40.3 | 35.8 | 36.5 | 31.8 | 33.6 | 24.3 | 25.1 | 29.8 | 31.0 | 31.1 | 32.9 | 35.2 | 33.0 | 33.3 | 37.2 | 40.8 | 42.2 | 41.7 | 32.9 | 29.1 | 33.9 | 39.3 | 36.3 | 33.1 |
| Pearce RAAF | 25.1 | 30.1 | 32.8 | 24.4 | 25.4 | 28.3 | 33.5 | 40.8 | 35.6 | 36.5 | 32.2 | 34.1 | 24.7 | 25.5 | 30.4 | 31.4 | 31.6 | 34.0 | 35.8 | 34.3 | 34.1 | 37.3 | 41.3 | 42.6 | 42.5 | 34.4 | 30.1 | 34.2 | 40.3 | 37.4 | 33.4 |
| Perth Airport | 23.9 | 28.3 | 30.3 | 23.6 | 24.8 | 26.6 | 33.0 | 40.1 | 35.7 | 36.7 | 32.3 | 32.7 | 22.9 | 24.8 | 30.0 | 31.0 | 31.2 | 32.3 | 35.3 | 33.2 | 33.3 | 37.2 | 40.5 | 41.7 | 40.9 | 31.7 | 29.4 | 34.0 | 39.5 | 34.7 | 32.4 |
| Perth Metro | 23.5 | 28.8 | 23.9 | 23.4 | 25.0 | 33.1 | 39.4 | 33.1 | 36.3 | 33.1 | 32.7 | 23.1 | 23.5 | 29.0 | 29.3 | 30.3 | 31.2 | 34.3 | 31.1 | 32.9 | 36.1 | 40.2 | 41.1 | 40.4 | 29.6 | 29.7 | 34.1 | 39.0 | 33.6 | 30.8 | |
| Rottnest Island | 20.1 | 21.6 | 23.0 | 22.9 | 21.0 | 21.4 | 27.9 | 32.1 | 30.7 | 30.3 | 33.3 | 26.1 | 22.2 | 21.3 | 24.0 | 23.8 | 25.1 | 25.1 | 25.4 | 24.2 | 25.8 | 27.2 | 37.7 | 35.8 | 26.3 | 24.2 | 26.0 | 27.7 | 34.7 | 29.0 | 26.0 |
| Swanbourne | 21.8 | 23.5 | 23.9 | 22.9 | 21.7 | 22.6 | 30.6 | 38.2 | 31.1 | 36.7 | 33.7 | 27.7 | 23.0 | 22.9 | 27.4 | 26.0 | 28.4 | 29.3 | 31.8 | 26.5 | 31.3 | 34.1 | 39.7 | 39.3 | 29.8 | 25.8 | 29.7 | 32.8 | 37.9 | 26.9 | 26.6 |
|
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 2020 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 6.5 | 9.5 | 11.7 | 11.4 | 9.7 | 9.9 | 11.7 | 14.3 | 18.6 | 19.6 | 20.3 | 18.7 | 14.3 | 9.6 | 10.1 | 11.5 | 12.3 | 12.4 | 14.4 | 14.5 | 12.2 | 12.4 | 14.8 | 22.0 | 24.1 | 19.0 | 12.3 | 10.3 | 16.0 | 21.4 | 18.7 |
| Garden Island HSF | 11.2 | 12.3 | 15.5 | 17.5 | 15.6 | 13.9 | 15.7 | 18.4 | 19.5 | 21.1 | 22.8 | 20.2 | 17.7 | 14.4 | 14.3 | 15.4 | 16.5 | 16.6 | 18.8 | 17.8 | 15.8 | 17.7 | 20.6 | 20.5 | 22.2 | 20.2 | 15.7 | 14.6 | 21.2 | 24.9 | 21.7 |
| Gosnells City | 8.0 | 12.5 | 13.3 | 14.0 | 12.5 | 15.6 | 18.1 | 24.0 | 23.5 | 20.5 | 17.8 | 15.0 | 14.0 | 15.4 | 15.6 | 16.2 | 19.5 | 17.5 | 16.0 | 16.9 | 19.1 | 24.3 | 16.1 | 14.3 | 19.0 | 26.2 | 22.0 | ||||
| Jandakot Aero | 5.0 | 9.6 | 10.8 | 14.1 | 12.0 | 10.9 | 15.1 | 17.2 | 17.2 | 21.4 | 23.7 | 17.6 | 17.1 | 11.9 | 13.6 | 14.6 | 15.8 | 15.8 | 18.1 | 17.1 | 15.3 | 16.3 | 18.9 | 19.9 | 17.3 | 20.3 | 15.4 | 13.9 | 19.6 | 25.4 | 21.5 |
| Karnet | 4.8 | 11.7 | 11.9 | 11.1 | 10.1 | 12.2 | 14.9 | 16.4 | 18.2 | 21.1 | 18.1 | 14.4 | 10.1 | 9.8 | 12.1 | 12.6 | 12.2 | 14.9 | 14.7 | 12.1 | 12.8 | 16.1 | 22.8 | 19.8 | 17.1 | 12.2 | 10.8 | 17.5 | 20.9 | 16.7 | |
| Mandurah | 10.2 | 13.2 | 14.5 | 16.3 | 15.7 | 13.8 | 15.4 | 18.6 | 19.4 | 21.5 | 24.4 | 21.5 | 17.3 | 14.3 | 17.4 | 20.1 | 24.0 | 23.8 | 19.5 | 15.3 | 14.6 | 20.9 | 24.8 | 21.4 | |||||||
| Millendon (Swan Valley) | 6.2 | 8.2 | 9.7 | 14.4 | 9.6 | 9.9 | 14.1 | 18.8 | 17.0 | 23.0 | 23.9 | 17.7 | 17.4 | 11.4 | 11.8 | 15.3 | 16.3 | 16.5 | 17.9 | 17.9 | 15.6 | 16.8 | 19.6 | 22.3 | 16.4 | 22.5 | 15.9 | 14.0 | 20.7 | 25.1 | 20.9 |
| Pearce RAAF | 5.4 | 8.7 | 9.3 | 15.1 | 10.6 | 10.2 | 14.2 | 20.4 | 17.2 | 23.4 | 22.4 | 18.0 | 17.3 | 11.6 | 13.5 | 14.9 | 16.2 | 16.6 | 19.1 | 16.1 | 16.0 | 17.3 | 21.2 | 23.3 | 16.2 | 22.3 | 16.2 | 14.7 | 21.5 | 26.2 | 21.1 |
| Perth Airport | 4.9 | 9.5 | 12.1 | 14.2 | 10.0 | 12.5 | 14.1 | 18.1 | 17.4 | 22.4 | 23.7 | 17.0 | 17.3 | 12.7 | 13.9 | 15.2 | 16.0 | 16.5 | 16.8 | 17.9 | 15.6 | 16.2 | 18.8 | 22.1 | 17.2 | 22.2 | 15.6 | 14.0 | 19.9 | 25.0 | 21.0 |
| Perth Metro | 6.6 | 9.8 | 12.1 | 15.4 | 14.4 | 12.8 | 15.4 | 18.0 | 17.9 | 21.1 | 23.1 | 19.4 | 17.4 | 13.4 | 14.0 | 15.2 | 16.5 | 16.4 | 18.5 | 18.0 | 15.7 | 16.5 | 19.2 | 20.5 | 19.2 | 22.0 | 16.0 | 14.2 | 19.0 | 24.1 | 21.5 |
| Rottnest Island | 12.8 | 14.1 | 16.0 | 16.8 | 15.9 | 14.6 | 16.2 | 19.6 | 18.5 | 19.8 | 22.5 | 20.1 | 16.6 | 15.5 | 14.7 | 15.7 | 16.9 | 17.2 | 19.2 | 17.9 | 16.3 | 18.2 | 20.7 | 23.7 | 21.0 | 19.7 | 16.0 | 15.0 | 19.9 | 23.3 | 20.9 |
| Swanbourne | 9.0 | 12.1 | 13.1 | 16.6 | 15.0 | 12.9 | 15.9 | 19.9 | 19.1 | 20.8 | 23.8 | 20.9 | 16.9 | 13.7 | 14.2 | 15.5 | 16.2 | 17.1 | 19.1 | 17.4 | 15.9 | 17.3 | 20.2 | 23.9 | 19.3 | 21.5 | 16.0 | 14.8 | 20.9 | 24.2 | 21.8 |
|
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 2020 | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | ||
| Anketell | 1.1 | - | - | - | - | - | - | - | 0.2 | - | - | - | 0.9 | 1.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Bickley | 2.2 | - | - | - | - | - | - | - | - | - | - | 6.4 | 2.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||
| Bungendore | 2.0 | - | - | - | - | - | - | - | - | - | - | - | 2.6 | 0.8 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Chidlow | - | - | - | - | - | - | - | - | - | - | - | - | → | 2.8 | ||||||||||||||||||
| Garden Island HSF | - | - | - | - | - | - | - | - | - | - | - | - | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Gidgegannup | 0.2 | - | - | - | - | - | - | - | - | - | - | - | 3.6 | 0.6 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Gosnells City | 0.2 | - | - | - | - | - | - | - | - | - | - | - | 1.2 | 6.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Huntly | 2.2 | - | - | - | - | - | - | - | - | - | - | - | 2.4 | 0.8 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Jandakot Aero | - | - | - | - | - | - | - | - | - | - | - | - | 1.2 | 0.8 | - | - | - | - | - | - | - | - | 0.2 | - | - | - | - | - | - | - | - | |
| Jarrahdale | 1.0 | - | - | - | 0.2 | - | - | - | - | - | - | - | 2.4 | 0.4 | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Karnet | 1.6 | - | - | - | - | - | - | - | - | - | - | - | 1.0 | 2.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Karragullen North | 1.8 | - | - | - | - | - | - | - | - | - | - | - | 4.4 | 2.2 | ||||||||||||||||||
| Maida Vale | 0.6 | - | - | - | - | - | - | - | - | - | - | - | - | 1.0 | ||||||||||||||||||
| Mandurah | 1.0 | - | - | - | - | - | - | - | - | - | - | - | 0.4 | 0.2 | - | - | - | - | - | - | - | - | - | |||||||||
| Millendon (Swan Valley) | 0.2 | - | - | - | - | - | - | - | - | - | - | - | 1.4 | 0.4 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Mount Solus | 1.2 | - | - | - | - | - | - | - | - | - | - | - | 1.8 | 2.0 | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Muchea | 0.2 | - | - | - | - | - | - | - | - | - | - | - | 2.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Mundaring | 0.6 | - | - | - | - | - | - | - | - | - | - | - | 5.8 | 2.8 | ||||||||||||||||||
| Perth Airport | - | - | - | - | - | - | - | - | - | - | - | - | 3.0 | 1.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Perth Metro | 0.4 | - | - | - | - | - | - | - | - | - | - | 3.8 | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||
| Pinjarra South | 0.4 | - | - | - | - | - | - | - | - | - | - | - | 0.2 | 1.8 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Roleystone | - | - | - | - | - | - | - | - | - | - | - | - | 4.4 | |||||||||||||||||||
| Rottnest Island | 0.4 | - | - | - | - | - | - | - | - | - | - | - | 1.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Serpentine | 0.8 | - | - | - | - | - | - | - | - | - | - | - | 0.8 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Swanbourne | 1.2 | - | - | - | - | - | - | - | - | - | - | - | 1.4 | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Tamala Park (Mindarie) | - | - | - | - | - | - | - | - | - | - | - | - | 2.4 | - | - | - | - | - | ||||||||||||||
| Wanneroo | 0.2 | - | - | - | - | - | - | - | - | - | - | → | → | 6.6 | ||||||||||||||||||
| Werribee | 0.4 | - | - | - | - | - | - | - | - | 0.2 | - | - | 0.6 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
|
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 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 Maps Records Summaries Daily observations Important notes the top
Notes
The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater Perth using the most timely and accurate information available on the date of publication; it will generally not be updated. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.
This summary includes data from observing sites in or near the Greater Perth “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.”
This statement has been prepared based on information available at 8 am on Monday 4 January 2021. Some checks have been made on the data, but it is possible that results will change as new information becomes available.
In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.
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.
Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.
Further information
- Media
- media@bom.gov.au (03) 9669 4057
Unless otherwise noted, all maps, graphs and diagrams in this page are licensed under the Creative Commons Attribution 4.0 International Licence
