Ther are 11 levels to the output NetCDF file. They are ...
1 : Rank value for selected month(s)/year (1=highest rank).
2 : Minimum grid value in any year for selected month(s).
3 : Maximum grid value in any year for selected month(s).
4 : Climatology mean per grid cell.
5 : Climatology standard deviation per grid cell.
6 : Grid value for selected month(s)/year
7 : Grid value departure from climatology.
8 : Grid value std dev from climatology.
9 : Significance trend for entire period (-1 to +1. -0.99 is significant decreate at 99th percent level. +0.8 is significant increase at 80th percentile).
10 : Trend change for entire period (a linear regression trend line is computed for the time series. The trend change is the difference between the last, and first y-axis values of the regression line.
11 : Missing values per grid cell (functionally only affects GISTEMP and Berkeley Earth).