Check if all months are between -24 and 12 (previous and current december)
Make sure that all the months specified in the (probably complex) month specification to dcc are correct months, in the sense that they range between -24 and 12. Further, return the earliest month in the complete selection to decide if we need previous year climate later on.
check_months(selection)
selection |
the month selection as vector, list, or nested list |
a list with the earliest month and the result of the check (logical)
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