http://www.equityclock.com/charts/30-year-u-s-treasury-bonds-futures-us-seasonal-chart/

if you are a bond trader, and if you occasionally look at seasonal charts, remember this...

all the bond charts are based on a very long term bull market in bonds.  there is NO chart that includes a long term bear market in bonds.  

if we are seeing a big change in the long term trend,  then future price action should not be anywhere close to what we see in these seasonal charts.