critu gismu

x1 is autumn/fall [harvest/cooling season] of year x2 at location x3.

See also citsi, crisa, dunra, vensa, crepu.

In notes:

citsi
x1 is a season/is seasonal [cyclical interval], defined by interval/property x2, of year(s) x3.
crepu
x1 (agent) harvests/reaps/gathers crop/product/objects x2 from source/area x3.
crisa
x1 is summer/summertime [hot season] of year x2 at location x3.
dunra
x1 is winter/wintertime [cold season] of year x2 at location x3.
vensa
x1 is spring/springtime [warming season] of year x2 at location x3; (adjective:) x1 is vernal.
mijycritu
m1 is the middle of fall/autumn [harvest/cooling season] of year c2 at location c3
critoinsa
x1 is Spring time/vernal [warming season] in the southern hemisphere and Autumn/autumnal [cooling season] in the northern hemisphere of year x2 and for celestial body x3.
vensraitu
x1 is Spring time/vernal [warming season] in the northern hemisphere and Autumn/autumnal [cooling season] in the southern hemisphere of year x2 and for celestial body x3.