Where does “säejakso” come from?

säejakso (Finnish) comes from Finnish säe, from Finnish säie, from Finnish sää, from Proto-Finnic sää, from Proto-Finno-Ugric säŋe — air.

Ancestry of “säejakso”, step by step

säejakso traces back through two separate lines of ancestry.

via Finnish säe

StepLanguageWordMeaning
1Finnishsäeline, verse
2Finnishsäiethread, strand, fibre, filament; thread; string
3Finnishsääweather; you; fiber, thread, strand
4Proto-Finnicsääweather
5Proto-Finno-Ugricsäŋeair

via Finnish jakso

StepLanguageWordMeaning
1Finnishjaksoperiod; episode; passage
2Finnishjaksaato manage, to have enough strength; to manage, to...
3Proto-Finnicjaksadakto manage, to be able to
4Proto-Finno-Permicjaksa-—
Every word from Proto-Finno-Ugric säŋe →Every word from Proto-Finnic sää →Every word from Finnish sää →