I just rolled up the most horrendous "habitable" planet ever.

[David Johnston2]

Cauchemar: 0.35: Standard (Garden) 265 (BB) 61% hydrosphere, 1.01 density, 0.83 diameter (6,554 miles), 0.83 gravities, 0.57 mass, Thin Breathable Atmosphere (0.58 atmospheres), -0.4 eccentricity, 253 degrees (Very Cold), Perihelion 0.21, Aphelion 0.56. Tidal Force 3.1, 282 days per day, 107 days per year, 5 degree axial tilt, Light Volcanic Activity, No Tectonic Activity, RVM -1, Habitability 5

The "average temperature" is Frozen, but during its 9 and a half month long day the current day side really heats up, and every 3 and a half months it gets close enough to the sun to sterilize the tropical zone and boil the oceans.

It's the most uninhabitable habitable planet I've ever seen.