Are you sure to travel there in February? February is very cold winter time in China. However, I have the following information to share with you.

Shigatse has a semi-arid, plateau temperate, monsoon climate. Temperatures range from a high of 23℃ (73.4F) to a low of -25℃ (-13F) with an annual average temperature of 6.3℃ (43.34F). From November to April, the temperature is quite low. The minimum temperature in Febuary may as low as - 9.5℃ and also due to the frequent wind and dry atmosphere, thus it is not a recommended time to visit.