Tuesday, 4 January 2022 - Monthly Climate Summary for Greater Perth - Product code IDCKGC11L0
Greater Perth in December 2021: very warm with an extreme heatwave in late December
December 2021 was very warm with mean maximum and minimum temperatures mostly a couple of degrees above average. An extreme heatwave occurred in late December, and Perth Metro recorded four consecutive days with temperature of 40 degrees starting on Christmas Day (25th)..
Light rainfall mid-month
- Monthly rainfall totals were less than 10 mm for most sites, which were 10-50% of the December average, although it is typical in summer
- Most sites recorded 2 to 3 days of light rainfall between the 17th and 19th from a weak cold front.
Well above average mean temperatures with an extreme heatwave in late December
- Mean maximum temperatures were 1–3 °C above average across Greater Perth.
- Perth Metro recorded a mean maximum temperature of 31.7 °C, which was 2.3 °C above average, the equal second-warmest December in Perth official records, equalling with 2020 and 1931 and behind the record of 33.1 °C in 2019.
- Perth Airport recorded a mean maximum temperature of 32.5 °C, which was 3.3 °C above average, its second-warmest December on record, behind the record of 33.9 °C in 2019.
- A severe to extreme heatwave hit Perth and surrounding areas in late December between the 24th and 29th, with maximum temperatures persisting over 40 °C and overnight temperatures remaining above 20 °C at many locations; a number of coastal sites had their highest December temperature on record on the 26th, and their warmest December night on record on the 27th.
- Perth Metro recorded a total of 5 days with maximum temperature of at least 40 °C, which was the first time for any month. The previous highest count was a total of 4 days on several occasions in the Perth official records.
- Four consecutive days with maximum temperature of at least 40 °C were recorded between the 25th and 28th, and it was the first such run for December and only the third occurrence for any month in the Perth official records. During this run, Perth Metro recorded its hottest Christmas Day (also the third-highest December temperature on the 25th) with 42.8 °C, and the second-highest December temperature on Boxing Day (26th) with 43.5 °C.
- Perth Metro also had 6 consecutive days with maximum temperatures of 38 °C or above between the 24th and 29th, which was the first such run for December and the equal longest-run for any month in the Perth official records.
Perth Metro
- Total rainfall for Perth Metro was 3.6 mm, which is 35% of the long-term average of 10.2 mm
- The mean daily maximum temperature for Perth Metro was 31.7 °C, which is 2.3 °C above the long-term average of 29.4 °C
- The warmest day was 43.5 °C on the 26th, and the coolest day was on the 17th when the temperature reached 22.7 °C
- The mean daily minimum temperature for Perth Metro was 17.8 °C, which is 1.4 °C above the long-term average of 16.4 °C
- The coldest morning was 11.2 °C on the 19th, and the warmest morning was on the 9th when the minimum temperature was 26.8 °C
Further information
- Media
- media@bom.gov.au (03) 9669 4057
Extremes Maps Records Summaries Daily observations Important notes the top
| Extremes in December 2021 | |
|---|---|
| Hottest day | 43.7 °C at Swanbourne on the 26th |
| Warmest days on average | 33.7 °C at Pearce RAAF |
| Coolest days on average | 26.6 °C at Rottnest Island |
| Coldest day | 19.7 °C at Bickley on the 17th |
| Coldest night | 8.1 °C at Karnet on the 19th |
| Coolest nights on average | 14.5 °C at Karnet |
| Warmest nights on average | 18.6 °C at Rottnest Island |
| Warmest night | 28.0 °C at Pearce RAAF on the 26th |
| Warmest on average overall | 25.0 °C at Pearce RAAF |
| Coolest on average overall |
22.6 °C at Bickley 22.6 °C at Rottnest Island |
| Wettest overall | 18.7 mm at Huntly |
| Wettest day | 7.8 mm at Huntly on the 17th |
| Strongest wind gust | 80 km/h at Pearce RAAF on the 7th |
Extremes Maps Records Summaries Daily observations Important notes the top
| Record highest December temperature | ||||||
|---|---|---|---|---|---|---|
|
New record (°C) |
Old record |
Years of record |
Average for December |
|||
| Rottnest Island | 42.5 | on the 26th | 40.6 | on the 6th in 1992 | 31 | 25.1 |
| Swanbourne | 43.7 | on the 26th | 43.0 | on the 26th in 2007 | 29 | 28.0 |
| Mandurah | 41.0 | on the 26th | 40.1 | on the 25th in 2010 | 21 | 27.3 |
| Record highest December daily minimum temperature | ||||||
|---|---|---|---|---|---|---|
|
New record (°C) |
Old record |
Years of record |
Average for December |
|||
| Pearce RAAF | 28.0 | on the 26th | = 28.0 | on the 20th in 2002 | 63 | 14.6 |
| Karnet | 24.6 | on the 27th | 23.6 | on the 23rd in 2015 | 56 | 13.5 |
| Rottnest Island | 27.0 | on the 27th | 25.7 | on the 17th in 1991 | 31 | 17.7 |
| Swanbourne | 27.2 | on the 27th | 25.9 | on the 24th in 2002 | 29 | 16.7 |
| Garden Island HSF | 25.5 | on the 27th | 25.0 | on the 24th in 2002 | 21 | 17.3 |
Extremes Maps Records Summaries Daily observations Important notes the top
| Summary statistics for December 2021 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperatures (°C) |
Minimum temperatures (°C) |
Rainfall (millimetres) |
||||||||||
| Mean for December 2021 |
Diff from average |
Highest for December 2021 |
Mean for December 2021 |
Diff from average |
Lowest for December 2021 |
Total for December 2021 |
Average for December |
Rank of December 2021 |
Fraction of December average |
|||
| Bickley | 30.2 | +1.9 | 40.3 | 26th | 15.0 | +1.2 | 9.2 | 14th | 6.0 | 14.3 | average | 42% |
| Garden Island HSF | 27.1 | +1.5 | 42.5 | 26th | 18.2 | +0.9 | 13.6 | 13th | 2.2 | 9.5 | low | 23% |
| Jandakot Aero | 31.6 | +2.3 | 43.3 | 26th | 16.8 | +2.0 | 8.7 | 19th | 2.6 | 10.3 | average | 25% |
| Karnet | 40.0 | 27th | 14.5 | +1.0 | 8.1 | 19th | 9.2 | 18.4 | average | 50% | ||
| Mandurah | 29.5 | +2.2 | 41.0 | 26th | 18.2 | +0.9 | 13.1 | 19th | 1.4 | 14.5 | low | 10% |
| Millendon (Swan Valley) | 32.9 | 42.9 | 26th | 16.5 | 9.3 | 1st | 5.8 | |||||
| Pearce RAAF | 33.7 | +3.2 | 43.3 | 25th | 16.4 | +1.8 | 8.8 | 20th | 2.4 | 10.8 | average | 22% |
| Perth Airport | 32.5 | +3.3 | 43.3 | 26th | 16.7 | +1.7 | 9.0 | 20th | 2.4 | 10.9 | low | 22% |
| Perth Metro | 31.7 | +2.3 | 43.5 | 26th | 17.8 | +1.4 | 11.2 | 19th | 3.6 | 10.2 | average | 35% |
| Rottnest Island | 26.6 | +1.5 | 42.5 | 26th | 18.6 | +0.9 | 14.7 | 2nd | 0.2 | 10.1 | low | 2% |
| Swanbourne | 29.1 | +1.1 | 43.7 | 26th | 18.2 | +1.5 | 12.7 | 1st | 1.8 | 10.5 | average | 17% |
Extremes Maps Records Summaries Daily observations Important notes the top
| Daily maximum temperatures for December 2021 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 23.7 | 26.9 | 28.8 | 31.0 | 32.3 | 30.5 | 32.4 | 36.9 | 35.1 | 22.9 | 20.4 | 23.8 | 26.6 | 23.0 | 28.0 | 22.7 | 19.7 | 20.6 | 26.6 | 32.0 | 30.0 | 32.5 | 34.5 | 36.8 | 40.0 | 40.3 | 36.5 | 38.1 | 37.7 | 33.4 | 32.0 |
| Garden Island HSF | 20.4 | 21.3 | 27.5 | 25.9 | 23.2 | 29.5 | 34.1 | 38.5 | 32.9 | 23.9 | 23.1 | 20.6 | 20.7 | 21.2 | 22.1 | 22.5 | 22.6 | 23.2 | 21.2 | 22.8 | 23.4 | 24.7 | 26.1 | 29.8 | 40.2 | 42.5 | 39.7 | 33.7 | 33.8 | 25.1 | 24.6 |
| Gosnells City | 33.8 | 34.6 | 24.6 | 29.7 | 39.5 | 43.1 | 40.4 | 40.5 | |||||||||||||||||||||||
| Jandakot Aero | 24.8 | 28.8 | 31.7 | 33.2 | 32.6 | 33.9 | 34.9 | 40.2 | 36.0 | 24.8 | 24.8 | 25.2 | 25.3 | 24.5 | 27.5 | 23.6 | 23.1 | 24.4 | 26.0 | 31.7 | 29.5 | 31.4 | 33.9 | 38.3 | 43.3 | 43.3 | 40.0 | 40.5 | 38.4 | 32.7 | 32.6 |
| Karnet | 27.8 | 22.6 | 20.8 | 26.2 | 31.0 | 29.4 | 32.4 | 33.9 | 38.4 | 39.8 | 40.0 | 38.0 | 37.9 | 33.5 | 30.5 | ||||||||||||||||
| Mandurah | 22.7 | 26.4 | 30.4 | 31.2 | 30.0 | 32.4 | 34.4 | 38.5 | 29.7 | 24.8 | 23.9 | 23.8 | 24.4 | 23.5 | 24.6 | 22.9 | 22.9 | 22.4 | 23.4 | 27.3 | 27.5 | 29.1 | 30.8 | 37.9 | 41.0 | 41.0 | 40.2 | 34.9 | 33.2 | 30.8 | 29.8 |
| Millendon (Swan Valley) | 25.8 | 29.1 | 31.3 | 33.4 | 34.8 | 33.2 | 35.4 | 39.5 | 36.9 | 25.6 | 25.6 | 26.5 | 29.4 | 25.5 | 31.1 | 25.7 | 23.3 | 24.9 | 28.7 | 34.5 | 31.9 | 33.8 | 37.2 | 40.0 | 42.6 | 42.9 | 41.5 | 40.9 | 40.1 | 34.8 | 34.5 |
| Pearce RAAF | 26.6 | 30.0 | 31.7 | 34.3 | 35.8 | 33.7 | 36.0 | 39.9 | 38.0 | 25.7 | 26.6 | 26.7 | 30.3 | 26.7 | 31.8 | 26.2 | 24.3 | 25.7 | 29.2 | 35.6 | 32.9 | 35.1 | 37.9 | 41.1 | 43.3 | 43.2 | 42.0 | 42.1 | 40.8 | 35.1 | 35.2 |
| Perth Airport | 26.0 | 28.9 | 31.5 | 33.5 | 33.8 | 33.4 | 35.1 | 39.9 | 36.8 | 25.0 | 25.1 | 26.1 | 28.0 | 25.4 | 29.7 | 24.4 | 23.4 | 24.3 | 27.1 | 32.9 | 31.7 | 32.5 | 36.0 | 39.7 | 43.1 | 43.3 | 40.6 | 41.5 | 39.5 | 34.2 | 33.7 |
| Perth Metro | 24.5 | 26.4 | 31.3 | 33.1 | 32.3 | 33.4 | 35.2 | 40.0 | 35.2 | 25.0 | 25.2 | 25.3 | 27.0 | 24.3 | 28.3 | 24.2 | 22.7 | 24.5 | 26.1 | 31.8 | 29.9 | 31.0 | 34.9 | 38.6 | 42.8 | 43.5 | 41.0 | 40.7 | 38.6 | 33.1 | 32.1 |
| Rottnest Island | 21.8 | 21.6 | 24.3 | 23.9 | 24.3 | 24.9 | 32.1 | 37.5 | 27.3 | 23.4 | 22.8 | 22.6 | 21.9 | 21.8 | 22.6 | 22.3 | 22.5 | 22.9 | 22.2 | 23.9 | 23.4 | 24.3 | 24.9 | 28.3 | 38.0 | 42.5 | 37.9 | 35.7 | 33.1 | 25.7 | 25.2 |
| Swanbourne | 23.0 | 23.3 | 30.6 | 27.4 | 27.4 | 32.0 | 35.3 | 39.4 | 33.1 | 23.9 | 23.9 | 23.1 | 23.8 | 22.9 | 24.4 | 23.2 | 23.1 | 24.1 | 22.7 | 25.1 | 25.0 | 25.7 | 30.3 | 33.8 | 43.2 | 43.7 | 40.9 | 37.9 | 35.2 | 26.9 | 27.2 |
|
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 2021 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 10.2 | 10.8 | 11.4 | 12.5 | 15.0 | 12.8 | 12.1 | 17.9 | 22.2 | 16.4 | 14.6 | 12.0 | 10.1 | 9.2 | 11.4 | 13.0 | 13.3 | 12.8 | 10.0 | 14.8 | 16.7 | 14.7 | 15.6 | 16.8 | 16.8 | 20.8 | 22.5 | 20.3 | 21.2 | 18.6 | 17.5 |
| Garden Island HSF | 14.8 | 14.1 | 14.8 | 16.1 | 18.7 | 16.3 | 15.6 | 22.2 | 18.6 | 19.0 | 16.8 | 13.6 | 14.2 | 14.8 | 16.8 | 17.1 | 17.9 | 13.6 | 17.3 | 19.2 | 17.9 | 19.5 | 20.5 | 21.7 | 25.4 | 25.5 | 23.1 | 20.7 | 19.7 | 20.1 | |
| Gosnells City | 15.6 | 17.6 | 16.5 | 13.6 | 9.9 | 10.9 | 18.8 | 23.8 | 25.3 | ||||||||||||||||||||||
| Jandakot Aero | 11.6 | 12.8 | 14.4 | 15.8 | 18.3 | 15.7 | 15.3 | 22.1 | 26.5 | 19.4 | 17.5 | 14.2 | 13.5 | 11.2 | 11.3 | 11.3 | 16.4 | 16.3 | 8.7 | 8.8 | 17.0 | 14.6 | 18.3 | 20.7 | 20.7 | 26.2 | 26.4 | 20.8 | 18.5 | 17.4 | 19.1 |
| Karnet | 9.5 | 11.5 | 11.4 | 12.8 | 14.6 | 13.1 | 12.0 | 23.5 | 16.4 | 14.8 | 12.1 | 10.5 | 10.0 | 10.5 | 12.2 | 14.6 | 11.4 | 8.1 | 12.3 | 15.5 | 13.6 | 15.7 | 16.6 | 17.4 | 22.1 | 24.6 | 21.9 | 14.2 | 15.6 | 16.9 | |
| Mandurah | 13.6 | 14.0 | 14.7 | 16.1 | 19.0 | 16.3 | 15.5 | 21.5 | 20.9 | 19.4 | 18.8 | 16.1 | 13.6 | 13.2 | 14.1 | 16.8 | 17.3 | 17.7 | 13.1 | 15.9 | 18.6 | 17.8 | 19.5 | 20.0 | 21.3 | 25.4 | 26.8 | 24.9 | 23.8 | 19.9 | 18.8 |
| Millendon (Swan Valley) | 9.3 | 13.2 | 15.2 | 16.2 | 18.6 | 16.0 | 15.8 | 22.3 | 25.8 | 19.8 | 13.3 | 12.4 | 11.8 | 10.5 | 10.5 | 11.7 | 13.8 | 13.2 | 10.7 | 9.4 | 15.0 | 13.7 | 17.8 | 21.4 | 20.9 | 25.7 | 27.2 | 25.3 | 17.8 | 17.7 | 18.1 |
| Pearce RAAF | 9.9 | 12.7 | 15.0 | 16.2 | 17.9 | 16.3 | 15.9 | 22.7 | 25.9 | 19.4 | 12.7 | 10.9 | 13.1 | 10.6 | 10.9 | 10.7 | 12.8 | 13.2 | 9.4 | 8.8 | 13.9 | 13.3 | 18.4 | 21.5 | 21.7 | 28.0 | 27.4 | 25.6 | 17.4 | 17.6 | 17.1 |
| Perth Airport | 11.9 | 14.1 | 14.9 | 16.0 | 18.5 | 16.3 | 15.5 | 21.6 | 26.7 | 19.6 | 16.6 | 14.6 | 12.5 | 11.3 | 12.6 | 11.3 | 12.9 | 14.0 | 9.1 | 9.0 | 16.1 | 13.8 | 18.9 | 20.5 | 20.5 | 24.5 | 26.3 | 23.9 | 18.4 | 17.7 | 18.6 |
| Perth Metro | 13.0 | 14.3 | 15.1 | 16.3 | 18.9 | 16.6 | 15.7 | 21.8 | 26.8 | 19.6 | 18.0 | 15.8 | 13.8 | 13.3 | 13.5 | 13.8 | 16.7 | 15.2 | 11.2 | 12.2 | 18.2 | 17.5 | 19.4 | 19.8 | 20.8 | 26.0 | 25.8 | 22.2 | 20.2 | 19.3 | 20.9 |
| Rottnest Island | 15.5 | 14.7 | 15.3 | 16.6 | 19.3 | 16.8 | 15.8 | 21.4 | 20.7 | 18.7 | 17.4 | 17.0 | 14.7 | 15.2 | 15.3 | 17.5 | 16.2 | 16.5 | 14.8 | 17.7 | 18.8 | 18.4 | 20.1 | 20.9 | 22.1 | 24.9 | 27.0 | 24.2 | 21.9 | 20.0 | 20.1 |
| Swanbourne | 12.7 | 13.6 | 15.1 | 16.6 | 18.2 | 16.2 | 15.9 | 22.7 | 24.5 | 19.1 | 18.2 | 15.6 | 14.2 | 13.3 | 13.3 | 14.7 | 16.7 | 17.3 | 13.1 | 14.0 | 18.5 | 17.4 | 18.8 | 21.1 | 21.9 | 25.9 | 27.2 | 25.3 | 22.4 | 19.2 | 20.9 |
|
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 |
||||||||
| Daily rainfall for December 2021 | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2.6 | - | 1.4 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Bickley | - | - | - | - | - | - | - | - | - | - | 0.4 | - | - | - | - | - | 4.2 | 0.2 | 1.2 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Bungendore | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 3.8 | 0.4 | 2.4 | - | - | 0.4 | - | - | - | - | - | - | - | - | - | |
| Chidlow | - | - | - | - | - | - | - | - | - | - | 0.1 | - | - | - | - | - | 5.3 | 1.0 | ||||||||||||||
| Garden Island HSF | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1.4 | 0.8 | - | - | - | - | - | - | - | - | - | - | - | - | |||
| Gidgegannup | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 6.4 | 0.8 | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Gosnells City | - | - | - | - | → | → | → | → | → | 0.6 | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||
| Huntly | - | - | - | - | - | - | - | - | - | - | 1.0 | 0.9 | - | - | - | 1.0 | 7.8 | 1.0 | 7.0 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Jandakot Aero | - | - | - | - | - | - | - | - | 0.6 | - | - | - | - | - | - | - | 1.8 | - | - | - | - | 0.2 | - | - | - | - | - | - | - | - | - | |
| Jarrahdale | - | - | - | - | - | - | - | - | - | - | 0.4 | - | - | - | - | - | 2.0 | 0.2 | 2.8 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Karnet | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 4.6 | 0.6 | 4.0 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Karragullen North | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 6.6 | 0.5 | 0.6 | |||||||||||||
| Maida Vale | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1.6 | |||||||||||||||
| Mandurah | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0.6 | 0.2 | 0.6 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Millendon (Swan Valley) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 5.4 | 0.4 | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Mount Solus | - | - | - | - | - | - | - | - | - | - | 0.4 | 0.2 | - | - | - | - | 3.8 | 0.8 | 2.0 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Muchea | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1.2 | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Mundaring | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 4.8 | 0.4 | 1.0 | |||||||||||||
| Pearce RAAF | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1.0 | 1.4 | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Perth Airport | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2.2 | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Perth Metro | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 3.2 | - | 0.4 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Pinjarra Refinery | - | - | - | - | - | - | - | - | - | - | 0.8 | - | - | - | - | - | 3.4 | 0.1 | 3.2 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Pinjarra South | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 3.2 | - | 1.4 | 0.2 | - | - | - | - | - | - | - | - | - | - | - | |
| Roleystone | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 4.0 | |||||||||||||||
| Rottnest Island | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Serpentine | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1.2 | 0.2 | 0.2 | - | - | - | - | - | - | - | - | - | - | - | - | |
| Subiaco Treatment Plant | - | - | - | - | - | - | ||||||||||||||||||||||||||
| Swanbourne | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0.6 | - | 0.6 | - | - | 0.6 | - | - | - | - | - | - | - | - | - | |
| Tamala Park (Mindarie) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||
| Wanneroo | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2.2 | |||||||||||||||
| Werribee | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 3.2 | 1.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Whiteman Park | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 3.8 | - | - | 0.8 | - | - | - | - | - | - | - | - | - | - | - | |
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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 3 pm on Tuesday 4 January 2022. 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
