4.6.0 may be most notable for the debut of ncclimo, a new operator that generates climatologies from monthly-mean input. Perhaps it's a tie with ncap2, which has a singularly useful new feature: variable lists/pointers. ncap2 also has a reduced memory footprint and a function to simplify adding CF-bounds variables (Thanks Henry!). As usual, ncremap continues to accrue useful features, the most notable of which is learning grid information from the CF "coordinates" attribute, if any.