An excellent summary from danno Above.
I agree with the seasons being slightly longer nowadays but with crappier wind in the "peak season", which is why we started opening the school in early September (vs October) for the past 2 seasons and we're also staying open until the end of April.
Here are the up to date stats from our school. Note that this is primarily sea breeze wind days and does not take into account the Easterly winds. With light wind gear getting better we are teaching in winds as low as 12 to 15 knots so our stats do count many of those days where the wind did not exceed 18-20 knots (about 31 days like this so far this season).
As of March 15 2022, we've been teaching for 106 days since September 2021 but only 75 of those days were "green arrow days" i.e. wind reaching above 18-20 knots.

Just like nature adapts to changing climates, we have to adapt as kiters as well. This means learning to enjoy lighter wind days and getting the right gear to do so. Where I'm from in Canada, kite spots would be packed with everyone having fun in 10-15 knots.
It's all a matter of perspective. Either adapt or change sport ? Either way, a bad season in Perth is still better than most places in the World.
Christian - KiteBud