The cruise's month and season every anomaly keys on

Since release v2026.11 (calcofi4db 4.34.0; Rasmus Swalethorp 2026-10-16, Ben Best 2026-10-20) a cruise's month is the calendar month of the median datetime of its root samples (cruise.month_median), not the YYYY-MM its cruise_key names (59 of 868 cruises centre on the month beside their key's), and the seasons are the meteorological DJF, MAM, JJA, SON, numbered 1–4 (the quarter column), December counting toward the following year's winter. cc_cruise_month() returns each cruise's month from the connection's cruise table where it carries month_median, else the key's YYYY-MM, else the month of datetime; cc_season() maps a month to its season number (1–4), and cc_season_label() to "Dec–Feb" … "Sep–Nov".

Usage

cc_cruise_month(con, cruise_key, datetime = NULL)

cc_season(month)

cc_season_label(month)

Arguments

con: DuckDB connection to a release (cc_get_db()).
cruise_key, datetime: vectors of equal length.
month: integer month (1–12).

Value

cc_cruise_month(): integer months; cc_season(): integer 1–4; cc_season_label(): character.

Examples

cc_season(c(12, 1, 6))          # 1 1 3
#> [1] 1 1 3
cc_season_label(cc_season(7))   # "Jun–Aug"
#> [1] "Mar–May"