The chill is extreme despite blue skies and bright sunshine .
The hill folk along with tourists can be seen enjoying basking in the sunshine , but streets in the state capital Shimla are quiet after sunset .
The state capital had a high of 15 C and a low of 5.8 C Monday .
Sub zero temperatures prevailed in the tribal belt . Keylong the headquarters of Lahaul & Spiti had a low of minus 5.1 C .
The weatherman has forecast dry cold weather for the entire week .