Which of the following statements regarding air temperature is/are correct ?
- 1. Air temperature is measured at a standard height of 1.2 m (4.0 feet) above the ground surface.
- 2. The average rate of temperature decrease with height is termed as the environmental temperature lapse rate.
Select the answer using the code given below :
1 only
2 only
Both 1 and 2
Neither 1 nor 2
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-1 – 2024
Statement 1 is correct. Air temperature is typically measured at a standard height of about 1.2 to 1.25 meters (around 4 feet) above a representative surface, often inside a Stevenson screen to shield the thermometer from direct sunlight and precipitation. This standard height is used globally for consistent data collection. Statement 2 is correct. The environmental temperature lapse rate refers to the actual decrease in temperature with increasing height in the atmosphere at a given time and location. The average rate of temperature decrease in the troposphere is about 6.5°C per kilometer, often referred to as the standard or average lapse rate.