First, temperature control is not essential if you make them in the winter, but variations in the temperature will affect the curing time. Humidity is important because if the atmosphere is too dry the salami will form a hard skin and wont dry properly.
A quick quide to prefered temperature & humidity:
1) For 12 hours after stuffing the salami should be "reddened" at 25C 80%RH this is done to allow the LS25 culture to ferment.
2) For the curing phase, the temperature is lowered to 12C with the humidity maintained at 80%RH. The time for curing will vary with temperature, humidity, skin size as well as how firm you like your salami, but an average is 4 to 6 weeks for hog casings to achieve a 30% weight loss, which is about right for most salamis.
3) I normally then rub the salamis with a little oil and put them in the fridge wrapped in greasproof to prevent more drying.
There are loads of recipes on
Len Poli's site