This post can be considered as an addition to my earlier Umathelan calendar post.
As already written, the Gloranthan year comprises five two-month seasons, followed by the two-week Sacred Time. For reasons that go back to Glorantha's distant past, each season is heavily influenced by one of the elemental runes. Sacred Time, however, is devoted to the Gods, and no single element holds sway on it.
In Umathela, it is a dry and chilly season.This is the time of traders and travellers.
In Umathela, it is a time of warm weather, with long rains. Harvest takes place at the end of this season.
In Umathela, it is a time of hot weather, with short rains. This is a time of activity for all Plant-Men. Fishermen have their best catches during this season.
In Umathela, it is cloudy and humid, but with little precipitation. The temperature is warm to cold. Trolls are most active during this time, whilst Brown Elves sleep.
In coastal Umathela, this means frequent hurricanes. In landlocked areas, heavy snow. Everywhere else, constant wind. The weather is overall cold.