Perth's Long Term Climate Pattern over 100 years
Maximum Temperatures for Perth have risen nearly 1.5 °C on average though they were very stable between 1940 and 1970. There has been a strong rise since 1990.
Minimum Temperatures have risen less about 1.2 °C on average, fairly linearly.
Diurnal Temperature Ranges, as a result, have risen at most 0.3 °C on average. However the range declined from the 1920s to the late 1980s and rose after that till 2006.
Rainfall, meanwhile, has shown a definite decline from around 900 mm down to just under 700 mm. This looks like the strongest long term decline of all the state capitals.