Questions about world and temperature

I'm creating a new world and I want it to be cold and unforgiving but not cryogenic winter level of hard.

Can anyone tell me how cold the sandbox setting "Very cold" actually makes the world and how it varies throughout the seasons? Is it cold in summer months at all? I want it cold enough to require fires every night and make low temperatures and storms a frequent problem but don't want to be hypothermic after 3 minutes outdoors. The world will start with power off as well so those beginning days need to be survivable.

Anyone experienced with the weather/temperature systems? Have you found a "sweet spot" for this kind of world? Challenging but manageable? I find cryogenic winter, even on the easy difficulty is still BRUTAL in winter months. Thanks in advance!