original: the term is applied both to routine weather variations and to extraordinary spells of heat which may occur only once a century .
simplifications: this can mean normal weather changes or abnormal heat which may only happen once in a century . the term is applied both to routine weather variations and to extraordinary spells of heat which may occur only once a century . the term is used for both routine weather variations and unusual periods of heat that only happen once every 100 years . the term is applied both to regular weather discrepancy and to extraordinary spells of heat which may occur only once a century . the term is used for both routine weather variations and extraordinay spells of heat which may only occur once a century . the term is applied to both routine weather variations and extrordinary spells of heat that may occir only once a century . the term is applied both to normal weather variations and to strange spells of heat which may occur only once a century . the term is applied by routine weather variations and massive spells of heat which occur once a century .