Hi Ahgu,
According to the wiki:
http://holowiki.org/wiki/DCG_Variables
"Room Temp (exposure) - Warmer increased sensitivity.
Room Humidity (exposure) - More humid increased sensitivity."
I have exposed DCG with room a humidity from about 45% to 58% or more
with temperature ranges between 16 deg C and 23 deg C.
I live in the UK, so the humidity can swing about quite a bit.
http://nw3weather.co.uk/wx10.php
I don't use any environmental controls in the exposure room and the central heating
is turned off in the room.
I use dip and shoot and store the fresh sensitized plates in the exposure room to dry.
I usually leave them to dry for 24 hours or more before exposure.
HTH,
Steven.