Be interested to know if there has been a statistically significant reduction since 1970 in the % of SW winds over 20 knots in Perth. Doesn't feel to me like we get almost one day in five or six over 20 knots these days (what the chart shows).
As we all know, the rainfall in the Perth region has certainly dropped off since 1970 - by a statistically significant 25%, or thereabouts I believe.
the wind rose diagram is in km/hr, so i guess it is saying what you're saying too.
i'd like to see the line graphs like the ones nebs put up calculate on max wind strngth between 9am and 6pm. i think the graphs would change a lot and show the real results for different seasons. 3pm doesn't really give the full pic unfortunately.
Am I reading that right then - the Perth Graph says that there are winds from the SW over 20 km/hr about 18% of the time? About the same as Adelaide (well, I'll be blowed - as an ex Addlebrainian that surprises me)
We get a lot more Westerlies also by the look of it (must try getting out at Woodies in one, one of these days).
But you're right, Nebbian's graphs do show something different. Perhaps at 5 pm would be more telling than 3pm - and show more of the max wind strength?
