Just some days ago I've upgraded my raspberry pi 3 installation of weewx 
from 3.x to 4.x (forced to because my SD card seemed to be corrupted).

Since I had to reinstall everything I decided to go with the most recent 
versions - i.e. upgrade raspian from stretch to buster, upgrade weewx from 
3.x to 4.x, switch from python 2 to python 3.

Getting weewx 4.x was not straightforward to me (I read my own 
documentation when I did my first install more then 2 years back and the 
current upgrade instructions) - by my fault I installed the python 2 weewx 
by apt-get, but finally I discovered the current apt-get repository, and 
now weewx-4.2.0 using python 3 is up and running.

I had an additional problem. My weather station is the Renkforce WH2300 
using the wh23xx extension. As far as I understand this extension is as of 
now not fully ported to python 3. But I discovered a fork an github 
https://github.com/EdwinGH/weewx-wh23xx
That's running smooth but (being beta) floods the logs - thus I've changed 
its function logmsg to to nothing (python command pass).

And now finally to my remaining problem: I also use the forcast extension 
with wunderground. Here, too, I'm using a temporary version from 
https://github.com/chaunceygardiner/weewx-forecast to get early python 3 
support. It seems to work - I get forcast messages. But the data shown seem 
to be partly off. If I do a direct WU query using json like

https://api.weather.com/v3/wx/forecast/daily/5day?geocode=48.959678,9.25629&format=json&units=m&language=en-US&apiKey=XXXXXXXXXXXXXXXXXXXXXXx

I get different max/min temperatures compared with the data shown within 
the seasons skin. Especially the forcast for the current day looks always 
bad. Did I make a mistake within weewx.conf - it contains only the WU 
api_key (no separate location)?

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