PURPOSE: To reduce the size of the title weather information display device and to accurately display a weather state by detecting variation in atmospheric pressure as variation in the output of an absolute pressure sensor and turning on and off a display element according to the output variation.

CONSTITUTION: An interruption signal generating circuit 71 charges a capacitor 72 when a transistor (TR) 20 turns on, and the capacitor 73 is discharged through a resistance 74 after the TR 20 turns off to send an interruption signal to a microcomputer 91 through a CMOS inverter 75. The microcomputer 91 enters a stand-by state after the TR 20 turns off, and becomes active again by receiving the interruption signal. Further, a signal from the absolute pressure sensor 41 is inputted 16 times at specific intervals of time, e.g. 5min to find the mean value. If there is variation, the stored value is updated to a new mean value and one of LED1WLED4 is lighted in correspondence to the variation to display the weather state.