Body temperature

The player's body can become cold or hot, and different body parts can have different temperatures.

Body Temperature model

Body temperature follows these guidelines :

Assumption 1: a naked person is comfortable at 19C/66.2F (31C/87.8F at rest).
Assumption 2: a "lightly clothed" person is comfortable at 13C/55.4F (25C/77F at rest).
Assumption 3: the player is always running, thus generating more heat.
Assumption 4: frostbite cannot happen above 0C temperature.*

• In the current model, a naked person can get frostbite at 1C. This isn't right, but it's a compromise with using nice whole numbers.

Here is a list of warmth values and the corresponding temperatures at which the player is comfortable, and at which the player is very cold. The warmth values, as displayed on the @ screen are in an internal value, where 0 is considered comfortable to normal humans. Best to keep all your body parts as close to zero as possible.

Warmth  Temperature (Comfortable)    Temperature (Very cold)    Notes
 
-60       55C / 131.0F                25C /  77.0F               
-50       49C / 120.2F                19C /  66.2F               
-40       43C / 109.4F                13C /  54.4F               
-30       37C /  98.6F                 7C /  44.6F               
-20       31C /  87.8F                 1C /  33.8F               
-10       25C /  77.0F                -5C /  23.0F               
  0       19C /  66.2F               -11C /  12.2F               * Naked
 10       13C /  55.4F               -17C /   1.4F               * Lightly clothed
 20        7C /  44.6F               -23C /  -9.4F
 30        1C /  33.8F               -29C / -20.2F
 40       -5C /  23.0F               -35C / -31.0F
 50      -11C /  12.2F               -41C / -41.8F
 60      -17C /   1.4F               -47C / -52.6F
 70      -23C /  -9.4F               -53C / -63.4F
 80      -29C / -20.2F               -59C / -74.2F
 90      -35C / -31.0F               -65C / -85.0F
100      -41C / -41.8F               -71C / -95.8F

What influences body temperature

Here are a list of things that affect body temperature:

Big ones:

• Ambient temperature
• Clothing warmth (reduced by wetness, except for items made of wool)
  • Clothing provides less warmth (50%) when it's too hot.
• When sleeping, furniture and clothing on the tile
• Damage (1% heat lost per 2% damage on the body part)

Smaller ones that accumulate:

• Fatigue (when awake)
• Hunger
• Sunny weather, clear weather
• Temperature of connected body parts
• Low immunity diseases: the common cold cools you down, but flu heats up your head.
• Several mutations and bionics
• When unarmed, wearing clothing with pockets will heat up your hands (if needed).
• When head encumbrance is 0, wearing clothing with a hood will heat up your head (if needed).
• Broken limbs make those body parts colder.

Other notes: fire/lava increases warmth and fights frostbite, but get too close and your skin will blister.

Body temperature problems

Too high or too low body temperatures can cause all kind of problems for the unprepared characters. You can regulate this by either wearing clothes with high warmth or removing them.

Continuous exposure to extreme temperatures can have very undesirable consequences.

Cold and sleeping

 @ : I'm cold and can't sleep at night. What can I do about this?

Gather some clothes that provide particularly high warmth (check the clothing page for that) and put them in the place you use to sleep in (or carry them with you if you're a nomad). Put the extra clothes on before going to sleep. You can also pile them up on the place you're going to sleep. Take them off when you wake up.

Check the warmth level of all your body parts in your character screen (@). If all of them are green then you'll likely be able to sleep without problems, unless a sudden drop in temperature occurs while sleeping.

Sleeping inside, and on a suitable piece of furniture can also help.

Being hungry, thirsty, wet, or having broken limbs can also make you feel the cold more, so try to avoid these effects before you go to sleep.

Effects on body parts

The effect of body temperatures on body parts is measured in intensities, with a higher number being a worse effect. So staying cold while suffering from cold intensity 1 will lead to cold intensity 2, which eventually will lead to frostbite, etc. Cold gives frostbite, heat gives blisters. Higher intensities inherit the effects of previous intensities.

So, a cold head of intensity 3 will also produce the effects of cold head intensity 2 and 1. And intensity 2 also that of 1.

Head

Cold

• Intensity 1: Your character will occasionally complain about the cold ("Brr.").
• Intensity 2: Reduces intelligence by one point
• Intensity 3: Reduces intelligence by 3 points and you'll be occasionally warned about it ("Your thoughts are unclear.").

Hot

• Intensity 1: Your character will occasionally complain about the heat ("Phew, it's hot."). Speed reduced by 2 points.
• Intensity 2: Increases thirst and creates up to 20 points of pain. It can make you vomit and hallucinate. You'll be occasionally warned about it ("The heat is making you see things."). Speed reduced by 5 points.
• Intensity 3: Increases thirst and creates up to 50 points of pain. You'll be occasionally warned about it ("Your head is pounding from the heat."). Speed reduced by 20 points.

Mouth

Cold

• Intensity 1: Your character will occasionally complain about the cold ("Brr.").
• Intensity 2: Reduces perception by one point
• Intensity 3: Reduces perception by 3 points and you'll be occasionally warned about it ("Your face is stiff from the cold.").

Frostbite

• Intensity 1: It'll create pain (up to 40 points) and you'll be warned ("Your face feels numb.").
• Intensity 2: Reduces dexterity by 3 points.

Blisters

Reduces perception by one point. Creates up to 35 points of pain. Will damage your head by one point.

Hot

• Intensity 1: Your character will occasionally complain about the heat ("Phew, it's hot.").
• Intensity 2: Increases thirst.
• Intensity 3: Increases thirst and creates up to 50 points of pain.

Torso

Cold

• Intensity 1: Reduces dexterity by one point and your character will occasionally complain about the cold ("Brr."). Speed reduced by 2 points.
• Intensity 2: Reduces dexterity by one point. Speed reduced by 5 points.
• Intensity 3: Reduces dexterity by 2 points and you'll be occasionally warned about it ("Your torso is freezing cold. You should put on a few more layers."). Speed reduced by 20 points.

Hot

• Intensity 1: Your character will occasionally complain about the heat ("Phew, it's hot."). Speed reduced by 2 points.
• Intensity 2: Increases thirst and reduces strength by one point. Speed reduced by 5 points.
• Intensity 3: Increases thirst and reduces strength by one point. You'll be occasionally warned about it ("You are sweating profusely."). Speed reduced by 20 points.

Arms

Cold

• Intensity 1: Your character will occasionally complain about the cold ("Your arms have goosebumps.").
• Intensity 2: Reduces dexterity by one point and you'll be occasionally warned about it ("Your arms are shivering.").
• Intensity 3: Reduces dexterity by 2 points.

Hot

• Intensity 1: Your character will occasionally complain about the heat ("Phew, it's hot.").
• Intensity 2: Increases thirst.
• Intensity 3: Increases thirst and up to 50 points of pain.

Hands

Cold

• Intensity 1: Your character will occasionally complain about the cold ("Brr.").
• Intensity 2: Reduces dexterity by 2 points and you'll be occasionally warned about it ("Your hands are shivering.").
• Intensity 3: Reduces dexterity by 2 points.

Frostbite

• Intensity 1: It'll create pain (up to 40 points) and you'll be warned ("Your hands feel numb.").
• Intensity 2: Reduces dexterity by 3 points.

Blisters

Reduces dexterity by one point. creates up to 35 points of pain. Will damage your left or right arm by one point.

Hot

• Intensity 1: Your character will occasionally complain about the heat ("Phew, it's hot.").
• Intensity 2: Reduces dexterity by one point.
• Intensity 3: Reduces dexterity by one point.

Legs

Cold

• Intensity 1: Your character will occasionally complain about the cold ("Your legs feel sluggish from the cold."). Speed reduced by 2 points.
• Intensity 2: Reduces strength by 1 point. Speed reduced by 5 points.
• Intensity 3: Reduces strength by 1 point and you'll be occasionally warned about it ("Your legs are seizing from the incredible cold."). Speed reduced by 20 points.

Hot

• Intensity 1: Your character will occasionally complain about the heat ("Phew, it's hot.").
• Intensity 2: Increases thirst.
• Intensity 3: Increases thirst and creates up to 50 points of pain. You'll be occasionally warned about it ("Your legs are cramping up.").

Feet

Cold

• Intensity 1: Your character will occasionally complain about the cold ("Brr.").
• Intensity 2: Reduces strength by 1 point.
• Intensity 3: Reduces strength by 1 point.

Frostbite

• Intensity 1: It'll create pain (up to 40 points) and you'll be warned ("Your feet feel numb.").
• Intensity 2: Speed reduced by 4 points.

Blisters

Reduces strength by one point. creates up to 35 points of pain. Will damage your left or right leg by one point.

Hot

• Intensity 1: Your character will occasionally complain about the heat ("Phew, it's hot.").
• Intensity 2: Creates up to 30 points of pain. You'll be occasionally warned about it ("Your feet are swelling in the heat.").
• Intensity 3: Creates up to 50 points of pain.