Solar minimum was December 2008

The Space Weather Pediction Center (SWPC) website reports that the Solar Minimum occured in December 2008.

A report carried on the NOAA/SWPC website says:

May 8, 2009 -- Solar Cycle 24 Prediction Update

The Solar Cycle 24 Prediction Panel has reached a consensus decision on the prediction of the next solar cycle (Cycle 24). First, the panel has agreed that solar minimum occurred in December, 2008. This still qualifies as a prediction since the smoothed sunspot number is only valid through September, 2008.

The panel has decided that the next solar cycle will be below average in intensity, with a maximum sunspot number of 90. Given the predicted date of solar minimum and the predicted maximum intensity, solar maximum is now expected to occur in May, 2013.

Note, this is a consensus opinion, not a unanimous decision. A supermajority of the panel did agree to this prediction.

Solar Cycle 24 Prediction Updated May 2009
http://www.swpc.noaa.gov/SolarCycle/SC24/