Thanks to John W0UN for forwarding this:
"November 5th, 2008 by Warwick Hughes
In the last week or so David has sent me the following graphics
illustrating where we might be in the current SC23-SC24 transition
period. These warrant an article on their own. I have changed the
order from the original post. Comments mainly from David.
Spotless days per month graphic
This graph shows just how different the current solar minimum is
compared to those of the second half of the 20th century and those of
the second half of the 19th century. The data is smoothed and that is
why there aren't any months with 30 or 31 days.
A large number of spotless days means that the following cycle is
going to be late, and the later a cycle is, the weaker it will be.
This graph points to Solar Cycle 24 being very weak."
http://www.warwickhughes.com/blog/?p=181#comment-20552
http://www.warwickhughes.com/blog/?p=180
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