Where could I ask question like this one?
Open Data is good, but maybe some site dedicated to this area in particular would be good.
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There is a Weather Forcasting proposal on area51.
You can support it and if it gets enough of a following it will become a Stack Exchange site.
At the moment, there is no suitable site for such a question.
In this particular case, you seem to be asking a question about how to do a particular piece of statistical analysis: I read it that you're looking for a statistical method to quantify, and put confidence on, any bias.
Cross Validated is the best place for that and other questions about statistics and data visualisation.
For questions about climate and sustainability, there's the Sustainability Stack Exchange.
The GeoScience proposal on Area 51 could also take such questions, should it launch. You can help get it launched, by following the proposal, by adding example questions, and by voting on the existing example questions.
And I've just recreated the Climate Change proposal on Area51, which could also take such questions
I think it is clear that there is no better site now to ask than it is currently asked - Open Data.
The Geoscience proposal on Area51 seems to be the most viable site to ask in the future.