The mercury dropped by a few notches and Keylong in Tribal Lahaul and Spiti district recorded minimum temperature at minus 4.6 degrees Celsius, while Manali and Kalpa recorded a low of minus 3 degree and minus 2.2 degree Celsius.
The high altitude tribal areas groaned under biting cold wave conditions with minimum temperatures staying between minus eight and minus 14 degrees Celsius.
All natural sources of water like springs, lakes, rivulets and tributaries of major rivers were frozen, resulting in sharp fall in discharge of water into snowfed rivers, affecting hydropower generation which has dropped to 25 to 40 per cent of capacity.
The mercury hovered around freezing point at some places in lower hills and also high altitude areas and Bhuntar and Una recorded minimum temperature at 2.0 and 2.7 degrees, while Dalhousie and Shimla shivered at 3.0 and 3.4 degrees, followed by Sundernagar 5.2, Solan 6.0, Dharamsala 6.6 and Nahan 8.9 degrees Celsius.
The sky remained heavily overcast and fog engulfed the region during the day time, further aggravating the cold wave conditions.
Dark convective clouds overcast the sky in state capital Shimla and strong velocity icy winds swept the region causing sharp fall in day temperature which dropped to 8.8 degrees Celsius, forcing people to stay indoors.


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