Monday, 1 June 2020 - Seasonal Climate Summary for Western Australia - Product code IDCKGC21R0

Western Australia in autumn 2020: a warm autumn; dry in the south

Autumn rainfall was below average for most of the southern two-thirds of Western Australia and in far north, while much of the southern Kimberley had a wet autumn. For the state as a whole, the mean temperature for autumn 2020 was the ninth-highest on record, as both the mean maximum and minimum temperature were among the top ten highest on record.

Below average rainfall for most of the southern two-thirds of WA

• For Western Australia, autumn rainfall was 28% below average, largely due to very dry April
• Several sites in the east Gascoyne and northern Goldfields recorded less than 30 mm seasonal rainfall totals, either their driest autumn on record or driest autumn since 1994
• Ex-TC Esther produced significant rainfall in excess of 100 mm to 210 mm in the inland southern Kimberley and Northern Interior on 1 March, resulted in a number of highest autumn daily rainfall records
• May was unseasonably wet in the Kimberley and Northern Interior, while it was a wet finish in the State's southwest and a once in a decade weather system impacted the western WA on the 24t hand 25th

Above average daytime temperatures for most of WA

• The mean temperature was 1.16 °C above average, the ninth-warmest autumn on record for Western Australia
• The mean maximum temperature was 1.43 °C above average, the tenth-warmest autumn on record for Western Australia
• The mean minimum temperature was 0.89 °C above average for Western Australia, the equal tenth-highest on record for Western Australia
• Mean minimum temperatures were in the mid-20s in the Pilbara coast and northwest offshore islands, the highest May mean minimum temperature on record
• April was warm across the State; the state-wide mean maximum and minimum temperature were the fifth-highest and second-highest on record for April respectively
• Mandora in the far southwest Kimberley coast recorded a late season high temperate record with 42.0 °C on 26 April, a first 42.0 °C in Australia post Anzac Day
• A number of sites in the north Kimberley had their coldest autumn day on record on 21 May as a broad cloudband blanked the northern WA
• Several sites in the Kimberley, Pilbara and the Southern Interior had their warmest autumn night on record in March and early April; Argyle Aerodrome's new autumn record of 31.1 °C on 2 April was also a national 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

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

Extremes Maps Records Summaries Important notes the top

Extremes Maps Records Summaries Important notes the top