Wednesday, 1 September 2021 - Seasonal Climate Summary for Western Australia - Product code IDCKGC21R0

Western Australia in winter 2021: warm winter days in the north

Winter rainfall was close to average for much of southern Western Australia, with below average rainfall across the southern Gascoyne to Southern Interior. Much of the South West Land Division saw near average winter rainfall, with areas in the Great Southern and the South Coast districts observed above average rainfall although parts of the Central Wheat Belt District recorded below average rainfall. Mean maximum temperatures were above average in eastern WA, while the western parts saw near average mean maxima away from the state's south-west corner. Mean minimum temperatures were above average for most of WA away from eastern parts of the Northern Interior.

Near average winter rainfall for southern WA

• Western Australia winter rainfall was 21% below average, but was still the state's overall wettest winter since 2018.
• Many sites in the eastern South West Land Division (SWLD) had their highest total winter rainfall for at least 20 years.
• A weak low pressure system moved along the state's south coast on the last day of May with daily rainfall of 30–40 mm recorded on 1 June, including a number of highest winter daily rainfall records.
• A strong cold front and associated low pressure system moved across the south-west of WA on 20 and 21 June, to bring widespread moderate to heavy rainfall to most of the SWLD, with very heavy daily totals of 90–170 mm recorded in and around Denmark, including several highest winter daily rainfall records.

Above average overnight temperatures for most of WA

• Western Australia's winter mean temperature was 0.84 °C above average, which was the eleventh-highest mean temperature in winter on record.
• The winter mean maximum temperature was 0.94 °C above average and winter mean minimum temperature was 0.73 °C above average for Western Australia as a whole.
• Kalumburu in the north Kimberley, observed 4 very hot days with daily maximum temperatures over 38 °C, which were 38.3 °C(23rd), 38.5 °C (24th), 38.7 °C(30th), and 38.6 °C(31st), and all equalled or exceeded its previous highest winter temperature on record.
• Wyndham Aero recorded the state and the country's two highest daily maximum temperatures of the season in August, with 39.0 °C on 31 August and 38.8 °C on 23 August.
• Most of WA observed a cold day on 21 June, with maximum temperatures below 20 °C in the Pilbara, and down to 9–12 °C or lower in southern parts of WA from the Central Wheat Belt and Great Southern, to the South Coast and South East Coastal districts; a number of sites had coldest winter day on record.

Extremes Maps Records Summaries Important notes the top

Extremes Maps Records Summaries Important notes the top

Maps
	Observed	Anomaly	Decile rank
Total rainfall
Mean daily maximum temperatures
Mean daily minimum temperatures

Click on a map to show it full size in a pop-up window

* 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