Tuesday, 8 February 2022 - Annual Climate Summary for Greater Perth - Product code IDCKGC51L0

Greater Perth in 2021: wet, a very warm start and finish

Annual rainfall was above average in 2021 across Greater Perth, due to a very wet July and October. Annual mean maximum and minimum temperatures were generally close to average.

Above average rainfall across Greater Perth

• Rainfall was above average across Greater Perth, with annual rainfall totals mostly in the 800–900 mm range, to 1000–1300 mm in the Perth hills.
• Swanbourne had its highest annual rainfall on record, and a number of sites had their highest for at least 20 years.
• Perth Metro recorded a rainfall total of 892 mm in 2021, which was more than 150 mm above the annual average, and the second-highest annual rainfall on record, behind the record of 904.8 mm in 1995.
• The wettest month of the year was July across Greater Perth; Perth Metro had its second-wettest July on record with 271.4 mm, just behind the record of 278. 6 mm in July 1995.
• October was also very wet; Perth Metro had its wettest October on record with 122.8 mm at the current site, which was also the wettest October since 1965 in the Perth official records when 126.3 mm was recorded at Perth Regional Office.

Very warm January and an extreme heatwave in December

• Annual mean maximum temperatures were generally within half a degree of average for most sites.
• Annual mean minimum temperatures were close to or slightly above average at most sites.
• The start of the year (January) was very warm, and an extreme heatwave occurred at the end of the year (December).
• Perth Metro recorded 5 days in total with maximum temperatures of 40 °C or higher in December, which was the highest count of such days for any month in the Perth official records.
• During the extreme heatwave in late December, Perth Metro recorded four consecutive days with maximum temperatures of 40 °C or higher between the 25th and the 28th, which was the equal longest run in the Perth official records.
• The hottest days of the year were either the 25th or 26th of December; Rottnest Island recorded its all-time highest temperature on record with 42.5 °C and also all-time highest minimum temperature on record with 27.0 °C on the 26th.
• Perth Metro recorded its third-highest temperature on the 25th ( 42.8 °C) and second-highest temperature on the 26th (43.5 °C) for December in the Perth official records commencing in 1897.

Perth Metro

• Total rainfall for Perth Metro was 892.0 mm, which is 121% of the long-term average of 736.8 mm
• The mean daily maximum temperature for Perth Metro was 25.0 °C, which is 0.2 °C above the long-term average of 24.8 °C
• The warmest day was 43.5 °C on 26 December, and the coolest day was on 2 September when the temperature reached 13.9 °C
• The mean daily minimum temperature for Perth Metro was 13.2 °C, which is 0.3 °C above the long-term average of 12.9 °C
• The coldest morning was 1.1 °C on 26 June, and the warmest morning was on 9 December when the minimum temperature was 26.8 °C

Extremes Maps Records Summaries Important notes the top

Extremes Maps Records Summaries Important notes the top

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported

Extremes Maps Records Summaries Important notes the top

Extremes Maps Records Summaries Important notes the top