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Bascially, the average home is 20 degrees C, but this is too hot for wine, the ideal is 10-13 C or 50-55 degree Fahrenheit. YOu can have it as high as 15C for emdium term storage but not above 18C. Main thing is to prevent temperatur fluctuation as noted by thewinedoctor.com with intowine saying much the same that 10-12C (50-55F) is optimnum, but any constant temperature withint 4-18C (40-65F will do). A wine kept at 68F will age twice as fast as those at 50F and at 55F (12C), it will age slowly and with better complexity.

Humidty-wise, relative humidity of 50-80% is acceptable, but 70% is recommended and of course it should be dark.