[fabianfred]

If it is a mod map... then open the map folder and open the load.ini file.....
there you will find the following...

[WORLDPOS]
CAMOUFLAGE = SUMMER
MONTH=7
DECLIN = 44
PRESSURE = 760
TEMPERATURE = 24

change the month to 12 or 1 and it will be winter so the 'nights are drawin' in a wee bit me old laddie'