/usr/share/sensor_msgs/msg/Temperature.msg is in libsensor-msgs-dev 1.12.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # Single temperature reading.
Header header # timestamp is the time the temperature was measured
# frame_id is the location of the temperature reading
float64 temperature # Measurement of the Temperature in Degrees Celsius
float64 variance # 0 is interpreted as variance unknown
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