20 october

A lot of detectors around me seem to have 20 october as the highest 3 month peak. I wonder what happen that day.
 

Yes, interesting. Looks like it travelled from W to E. Was there rain?
I find it useful to keep a synoptic chart from every day in my database, as well as temperature, humidity, and pressure data. It can help to complete a picture.

At a further glance, this looks widespread. If I look at any chart to the S/SW of simmomax - I looked as near as stations mw0uzo, nn18, LJ, as far as Bonn and Paris, and between all those places, and at all stations between there is definitely an increase that would correlate, time wise, to the passage of the wind from the UK. Startling actually - If only we had some synoptic charts for that time period!
edit - Looking further, station DoseMonkey to the north of simmomax got a dose, then go S/W from (and including) station nn18 (UK) to station Mercator (NL), and beyond to station Glanerbridge and PA1SDB and maybe you will get the gist. Also, FSM19 in Portugal has a small mountain in their chart not too long after that time.
I will look into this more when time permits.

I had higher readings from 19th - 23rd which coincided with heavy rain and strong winds. I expect something similar for a few days. I live about 50 miles west of the old Uranium mines at Viseu!

I had weather during that period also. Here are the weather charts from my database. (Tasmania is the island at the bottom centre-ish, with the approaching low and cold front crossing. It would be good to source charts like these for Europe.


 

And below are the graphs.