Seasons of Carcosa

Bruce Pennington

Carcosa's solar year lasts for nine months, each of fifteen days' duration. The seasons are as follows:

Hot Dry (or "Dustfall") (2 months): The driest and hottest portion of the year. Crops wither and creatures seek shelter. Humans go about in full-body cloaks to avoid exposure to solar radiation. Some flora and fauna hibernate during this period. Dust storms, brushfires and solar flares are common.
Black Rain (1 month): As the temperature decreases, noxious clouds rise from Lake Hali and fall on the landscape as black rain. Creatures and plants mutate to survive the rain's toxins. Humans hoard clean water.
Sporing (3 months): Coldest and wettest season. Freshwater storms wash away the black rain and life blossoms. The fungal forests sporulate during this time. Humans wear filter masks to avoid fungal infections. Floods and thunderstorms common, but overall a time of bounty.
Hot Wet (3 months): Storms give way to humidity. Fungal forests grow. Humans retreat into caves, which offer respite from the relentless heat. Overland journeys are difficult because exhaustion sets in quickly.

There are two major moons, Yuggoth and Pnakotoi. The former rises at night and the latter during the day.
Yuggoth has a fifteen day cycle and is associated with the nine months. When it is full, it projects eldritch energy that increases the power of spells and stimulates uncanny beings. 'Werethings' transform under a full Yuggoth.
Pnakotoi has a sixty-day cycle. It normally achieves fullness at the same time as Yuggoth, creating a double full moon once every four months. Full Pnakotoi augments the effects of full Yuggoth.

Bruce Pennington

The nine months of Yuggoth:

- Dust Moon: For the heavy dust clouds that rise at the beginning of the dry season. The full moon stimulates the spawning of giant dust worms.

- Ulfire Moon: the ulfire tint reflects the heat on the planet's surface. Creatures of invisible flame walk the land on the full moon.

- Black Rain Moon: A moon often obscured by thick black clouds. When its pale light strikes the ground, horrors spawn from the mud.

- Thunder Moon: A welcome moon that heralds the end of the black rain season and the coming of fresh water. Sorcerors perform rituals of renewal under this moon.

- Spore Moon: Spore clouds rise in this month and turn the sky greenish-white. When the full moon shines, spells spontaneously cast themselves from the minds of spellcasters.

- Hunt Moon: A bright moon, beloved by predators, who use it to hunt the young prey spawned during the Sporing season. Old beasts stir under its light and warriors make sacrifices of blood.

- Yellow Moon: A sickly moon, presiding over humidity and infection. Madness flares up in this month, and at full moon Hastur walks the earth far beyond his demesne in Lake Hali.

- Fruiting Moon: In this month, the fruiting bodies of fungi grow wildly, sometimes so fast as to coat a sleeping victim overnight. Fungal forests become nigh impassable. Spellcasters sprout mushrooms from their facial cavities. At the full moon, the fungi walk and perform strange rituals, while humans and beasts are rooted to the ground.

- Moth Moon: Named for the dolm moths that swarm in this month. Men and beasts store food jealously as the last supplies are depleted before the coming of the dry season. On the full moon, the moth swarms reach their peak and humans feel restless, a desire to travel.

Bruce Pennington