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Chapter 2: Building Games / Environment / Climate


Source GM Core pg. 95
Often, temperature doesn't impose enough of a mechanical effect to worry about beyond describing the clothing the characters need to wear to be comfortable. Particularly hot and cold weather can make creatures fatigued more quickly during overland travel and can cause damage if harsh enough, as shown in the Temperature Effects table below.

Appropriate cold-weather gear can negate the damage from severe cold or reduce the damage from extreme cold to that of particularly severe cold.

Table 10-13: Temperature Effects

Incredible cold-80º F or colder (-62º C or colder)2 hoursModerate cold every minute
Extreme cold-79º F to -21º F (-61º C to -29º C)4 hoursMinor cold every 10 minutes
Severe cold-20º F to 12º F (-28º C to -11º C)4 hoursMinor cold every hour
Mild cold13º F to 32º F (-10º C to 0º C)4 hoursNone
Normal33º F to 94º F (1º C to 34º C)8 hoursNone
Mild heat95º F* to 104º F* (35º C to 40º C)4 hoursNone
Severe heat105º F* to 114º F (41º C to 45º C)4 hoursMinor fire every hour
Extreme heat115º F to 139º F (46º C to 59º C)4 hoursMinor fire every 10 minutes
Incredible heat140º F or warmer (60º C or warmer)2 hoursModerate fire every minute
* Adjust temperatures down by 15º F (9º C) in areas of high humidity