Talwin

In the Wilderness between the Terran Empire and the Merseian Rhoidunate, the system of the star Siekh includes many asteroids but only four planets, including Talwin: 

eccentric orbit, probably disrupted by early passage of another star;
distance from Siekh varying from 0.87 astronomical units to 2.62 a.u.;
three degrees of axial tilt;
planet-wide seasons;
twice-Terran year;
six month summer, six week autumn, fifteen month winter, six week spring;
eighteen hour day;
no moon;
blue vegetation;
ankle-high equivalent of grass, called wair by Merseian explorers;
many scattered islands;
one continent (400 kilometers wide, wedge-shaped, stretching from north pole to equator, divided by an east-west mountain range);
huge icecaps forming, extending 45 degrees, then melting each year;
spring floods;
in summer, snowless mountain peaks, northern swamps, boiling southern lakes and rivers;
Domrath, winter hibernators, feast and copulate all autumn;
Ruadrath estivate as sea animals all summer.