I do not think you are telling us everything which you are 
doing/changing!!  When you first posted to this thread the loop records 
were in US units, and UV values appeared to be very high.  Your latest 
posting has loop records in metric, and UV values appear to be more like UV 
index values.

So, do you still have a problem?  If you have been changing your database 
units then your database could well contsin a mixture of imperial and 
metric values - with very unpredictable results.

On Saturday, 14 April 2018 02:49:33 UTC+3, Greg Troxel wrote:

> Andrew Milner <andrew.s...@gmail.com <javascript:>> writes: 
> > matthew has already said tha weewx does not calculate uv index - it 
> merely 
> > uses the data provided by the station 
> But if there is some hardware that provides bits in a UV field, then a 
> driver for that hardware should be translating the bits into an index 
> value according to the encoding used.  I don't think we should be using 
> calibration notions as a substitute for a well-understood 
> representation.  But maybe I'm missing something here. 

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