Plot degree days at depth for each season start date

Usage

plot_degree_days(dd_table, facet_var = NULL, ncol = 1, nrow = NULL)

dd_table: Dataframe with degree-day data, as exported from count_degree_days. Must include columns DEPTH, START_SEASON, n_degree_days.
facet_var: Variable(s) defining faceting groups. Variables must be column(s) in dat). For a single facet variable: facet_var = "SEASON". For more than one facet variables: facet_var = "SEASON + DEPTH". Default is facet_var = NULL.
ncol: Number of columns for faceted figure. Default is ncol = 1.
nrow: Number of rows for faceted figure. Default is nrow = NULL.

ggplot object