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A B S T R A C TThe relationship between temperature and humidity of air and visibility of mirage has been studied by observing mirage on the runway of Sultan Iskandar Muda International Airport (SIM) Aceh, Indonesia. Temperature and humidity data were obtained from BlangBintang Meteorology, Climatology and Geophysics Station's database, Aceh Besar, Aceh, Indonesia. It was observed that mirage has shown up from morning to afternoon, from 07.00 AMuntil 18.00 PM, even until sunset. Mirage is also still visible when the weather is cloudy or drizzling, but disappeared when heavy rain. The lowest and highest temperatures where the mirage can still be observed are 26.0 0 C and 32.0 0 C, respectively. Meanwhile, the lowest and highest air humidities where mirages can still be observed are 51.0% and 92.0%, respectively. Observation shows that changes in temperature and humidity in the runway environment greatly affect the appearance and visibility of mirages. When the air temperature is high and the humidity is low, the mirage appears with high visibility (very thick), so that it can be observed clearly visually. Conversely, when the temperature of air is low and the humidity is high, mirage appears with low visibility (very thin) or almost non-existent or completely gone.

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