I know we can print the current year by \the\year. How about the reasons? I live in north hemisphere, so the definition of the four seasons at here: https://en.wikipedia.org/wiki/Season#Meteorological works for me.
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biblatexsolution for completeness to https://tex.stackexchange.com/questions/292600/how-to-print-spring-if-in-month-is-in-jan-june-otherwise-fall/568130#568130 as it deals with published material (lectures). – Cicada Oct 24 '20 at 09:56