Weather and Climate Command Center The Weather and Climate Command Center was a facility in the heart of the Lost City of the Jedi . According to DJ - 88 , droid administrator of the Lost City , it was the Control Center which was actually responsible for regulation of the climate of Yavin 4 . DJ - 88 claimed that Yavin 4 had originally been a frigid ice world before ancient Jedi Masters terraformed its surface and opened vast steam vents to warm and water imported foliage . The water vapor output of the vents was controlled by the Weather and Climate Control Center . Under the tireless , millennia - long direction of the Center ' s droid operators , Yavin 4 settled into a six - month wet season contrasted with a six - month dry season . During Trioculus ' onslaught on Yavin 4 , Treaded Neutron Torch es set fire to the moon ' s vast rain - forests . Fleeing the unquenchable blaze , Luke Skywalker entered the Lost City through one of the titanic steam vents and petitioned DJ - 88 for help in defeating the Imperial forces . Although the moon ' s wet season was months away , DJ - 88 ordered that the steam vents be opened prematurely . Skywalker , himself provided the code necessary to activate the ancient Climate Control machinery , an alphanumeric sequence which the Force spirit of Obi - Wan Kenobi had imparted to him in a dream : ' JE - 99 - DI - 88 - FOR - 00 - CE ' . Upon receipt of this activation code , the steam vents opened to full capacity . The resulting condensation generated massive thunderstorms which doused the raging wildfires . Presumably , the Weather and Climate Control Center was sealed after the abandonment of the Lost City of the Jedi . Behind the scenes . At first glance , the designation " " Weather and Climate Control " " may appear redundant . However , in - depth study of the meteorological sciences ( and / or Wikipedia ) reveals the distinction between weather and climate : " is a term that encompasses phenomena in the atmosphere of a planet . Weather is the state of the logical and scientifically explained atmosphere at a given time and place . The term usually refers to the activity of these phenomena over short periods ( hours or days ) , as opposed to the term , which refers to the average atmospheric conditions over longer periods of time . " ( from " Wikipedia : Weather " . ) Clearly , the ancient Jedi Masters had an advanced understanding of meteorology . Multiple numerological interpretations of the mysterious activation code ' JE - 99 - DI - 88 - FOR - 00 - CE ' are possible . From an in - universe perspective : In the arcane numerology of the Bendu monks , the number nine ( often represented symbolically as eight spokes within a ring ) represented the beneficent presence of the Force in a unitary Galaxy . Eight , of course , is the number of spokes within the " Bendu Wheel " , most likely symbolizing the totality of life encompassed by the unbroken , self - feeding circle of the Force . A zero value could represent either the inevitability of life ' s end and re - absorption into the currents of the Force or the mutual cancellation of the negative and positive values of the Light and Dark sides . The double repetition of each number ( 99 - 88 - 00 ) could signify the conflicted duality of the Force ' s nature in Jedi dogma . By this scheme of interpretation , ' 99 ' is the eternal cycle of Bogan and Ashla , ' 88 ' is the life , both good and evil , generated thereby , and ' 00 ' is the ultimate annihilation of these oppositely polarized qualities , similar to the destruction of and . The significance of the letters ' JE - DI - FOR - CE ' is indeterminate but possibly represents the bond between the Jedi Order and the will of the Force .