Place the Options component available from most of the simulation component palettes or simulation library groups.
View attachment 178848
Using this you can set
Temp (Simulation temperature) - Sets the ambient temperature at which a simulation will be run.
The default is 25 degrees Celsius. The predefined variable temp is set to this value.
Tnom (Model temperature) - Sets the default value for the nominal temperature of models. The default is 25 degrees Celsius. The predefined variable tnom is set to this value.