Cycling into the wind

So now I've merged the wind data that I was using with the thorn plots and the cycling data on the Tableau public dashboard. It uses an average wind speed and direction based on the two metar observations nearest to the mid-time of the ride. 

I wondered how to show wind direction, but in the end a simple grouping by quadrant was easy to do and good enough to separate the data into meaningful groups.

The effect of windspeed on the way home, when the wind is in the SW is pretty clear, I think.

I just wish I could get a sensible data between start&end calculated field in the title. Could not get this to work in Tableau.