I am referring to incorrect zero wind speed readings from the Sky. It has come up a few times on this forum that some times a zero is measured when it is not zero wind speed. I wanted to prove if it was an incorrect reading so I set up a fan and ran it for a few days. There were occasional 3 sec values recording zero speed when it was not zero speed. David explained the issue as a glitch. So I assume from my experiment that it may always occur perhaps a few times per day.
And there is another problem which may have been fixed in a recent firmware update that records an entire minute as zero speed even though when I watched the 3 second values they were reading strong winds.
For this reason to display my average wind speed I am using the higher of some average wind speeds to prevent the random false zeros reducing the average. It does mean my average is lifted.
I am still experimenting with what size and number of periods to average together and take the maximum, but you get the idea.
Here are 2 graphs of a windy day with a southerly change showing how I was displaying it. And the new version which has lifted the false average green arrow at 11:40. (And there were 4 periods during that day with false zero’s.)
The average including the false zeros:
The average roughly using the highest one minute average of each 5 minutes (It is not exactly that but gives you the idea):
My scale is coloured to suit 9 to 15 knots being ideal paragliding wind speed.