Historical Weather Reports

I'm trying to find out what the weather would have been like in Northern Germany in November-December 1945. I have found a site called http://www.tutiempo.net/en/ which has records for most years. There is a gap from 1943 to 1949 (I can probably guess what happened to the German official weather service). I can take an average from the surrounding years.

My main question is: Can I rely on these records and where are they getting their information from?

Does anyone have any suggestions for other reliable sources?

pdr said:

war years. The UK certainly did have met info re Germany 'cos of bombing raids etc for allied aircraft and invasion threats etc.

Would the appropriate museums have info?

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That's my next port of call. The National Archives near London will probably have something useful.

I tried e-mailing the Met Office but all the person who answered seemed not to have read my e-mail. They have historical records for the UK but I'll have to ask again about Germany.