Make a list of data frames for months and seasons
make_seasons(start_year, end_year, seasons = NULL, dec_adjust = 1)Numeric. Year of first and last season
Dataframe mapping each month to a season. Default (NULL)
will use south hemisphere seasons. Needs columns mon (numeric 1:12), month
(character name to use for months) and season (character name of season to
use for that month)`
Logical. Adjust the year in which December is used? If
TRUE (default) December will be included in the following year's first
season (i.e. December 1999 will be included in, say, summer 2000)
List with elements
itemluseasonsDataframe. Lookup used to translate months to seasons. Equal
to seasons if that was provided by seasons argument
itemmonthsDataframe for each month from start_year to end_year,
including start and end dates
itemseasonsDataframe for each season from start_year to end_year,
including start and end dates