No - I've not made a connection between the amount of precipitation and 10MHz propagation. But I had noticed that there was an EMC issue between 10MHz (and some other bands) and the amount of rain recorded on the Fiddlesticks Weather Station.
The rain gauge and Butternut vertical are only a few metres apart so it seemed that a little bit of RF was getting into the sensor on a few bands.
I just popped a ferrite ring onto the lead from the rain gauge to the sensor in the hope that it would remove the RF. It seems to have worked.
But if you notice some oddities in the rainfall figures, it might well be me on HF!
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