India Meteorological Department (IMD) has recently said, the Cold wave conditions will continue in Northern India till December 29, 2022.
What is a cold wave?
- The IMD records a cold wave when the minimum temperature is equal to or less than 10 degree Celsius at a weather station in the plains, and is 5 degrees to 6.4 degrees below the normal temperature for that period.
- A cold wave may also be recorded at a station in the plains when the minimum temperature is less than or equal to 4 degree Celsius.
- For hilly regions, a cold wave is declared when the minimum temperature is less than or equal to 0 degree Celsius and the minimum temperature is 4.5 degrees to 6.4 degrees below the normal.
- The ‘normal’ temperature is calculated for every five days by taking the average temperature for these days over the past 30 years.