There is a paper floating around showing that for both US+Canada and the continental EU there has never been a single hour where there has been no wind and no sun somewhere in a 30 year period.

> There is a paper floating around

This needs a better cite.

I mean, would you believe it the other way around?

Someone claiming, there was a day with no wind and no sun in whole north america in the last 30 years?

I wouldn't believe that. But concrete data to have, is of course better than assuming ..

Here's the CAISO wind graph. This is the total wind energy from four large states. Note that the low point is 1/7 that of the peak, which is around noon.[1] Here's the PJM wind graph.[2] Low point is about 1/4 the peak, again, around local noon.

It just doesn't "average out" across even a sizable country.

[1] https://www.caiso.com/todays-outlook/supply

[2] https://dataviewer.pjm.com/dataviewer/pages/public/wind.jsf

Now click the demand view.

It goes dramatically up and down on a daily pattern, too.

The demand curve and the wind curve are not synchronized in any way. Solar at least peaks with peak air conditioning load.

If only we could store some energy for a while!