Structure and culture of spiti houses . Spiti valley, Himachal Pradesh, IndiaSpiti Valley in winter, Winter in Spiti is extremely harsh and temperatures are known to sometimes fall to -40 degrees Celsius. It is a traditional mud house built more than 100 years ago and is also one of the oldest houses in Spiti Valley. Being mud based the house is naturally insulated, and will be cool in summers and warm in winters. This type of construction is extremely strong and resistant to earthquakes.