Thanks for digging that one out VP. A very interesting read, looks like there is no correlation between sunspots and thunderstorms. However that report is from 1936, so maybe more evidence will surface to support this. Also I noted the temperature correlations with sunspot activity, some evidence to suggest that fewer sunspots doesn't always equate to lower temps. This for me shows where the oceans play there part, heat stored and then slowly released over time. Now I'm sure I have a paper regarding solar activity and the oceans somewhere, but finding it will prove quite a challenge, with my cluttered filing system!