The temperature dipped to minus five degrees Celsius at Sandinala, about 10 km from Ooty, as Udhagamandalam is popularly known, in the wee hours, district officials said.
The area recorded minus three degrees Celsius on December 24 with the sub-zero temperature occurring in the region after a gap of three years.
Ooty itself recorded a minimum temperature of zero degree Celsius early today and the intense cold forced the residents to remain indoors till about noon.
The Met office in Chennai yesterday has issued a frost warning, saying ground frost was likely to occur at a few places over hill ranges of Nilgiris district during next two nights.
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