While the sun was shining on most clean energy stocks in April, my ten clean energy picks for 2013 (introduced here) got relative showers. The Powershares Wilderhill Clean Energy Index (PBW) was up a sunny 14.1% for April to 19.6% for the year, rising quickly past my picks, which inched up a relatively meager 0.7% to 7.5% for the year so far. Meanwhile, the broad universe of small stocks gained 2.6% for a year to date gain of 15.1%, as measured by my benchmark the iShares Russell 2000 Index (IWM).