חֹרֶף chorep "harvest/winter" is used several times, as it is in Amos 3:15, with qayits "summer/summer fruit" (Gen 8:22; Ps 74:17; Is 18:6; Zech 14:8). Both words refer to, both a season, and to the agricultural activities associated with it. Jer 36:22 gives us an indication of the time of year meant by chorep for it reads:
"the king was sitting in his chorep house
(it was the ninth month),
and there was a fire burning in the brazier before him."
The ninth month (chisleb) ran from mid-November into December, the month before (Marchesvan or Bul) was the season of plowing (an activity associated with chorep). From this we can deduce the rendering "winter house" as an approximation for "chorep house" here and in Am 3:15.