2012-01-16 00z, mean= +nan, std= +nan
2012-01-30 06z, mean= +nan, std= +nan
2012-03-03 12z, mean= +nan, std= +nan
2012-03-31 12z, mean= +nan, std= +nan
2012-03-31 18z, mean= +nan, std= +nan