Perth is set to swelter through a record-breaking Christmas heatwave with authorities urging people to comply with total fire bans in Western Australia. The temperature in the West Australian capital is set to reach 39C on Christmas Eve before climbing to 42C on both Christmas Day and Boxing Day. That would make it the hottest Christmas period in Perth since records began more than a century ago, according to the Bureau of Meteorology, exceeding the 2007 period when the three-day average temperature was 40.3C. The mercury on Christmas night is tipped to reach 27C and there is little relief on the horizon, with maximum temperatures set to remain in the high 30s. Total fire bans are likely to be implemented, particularly throughout the southwest, with Fire and Emergency Services Commissioner Darren Klemm describing the forecast hot and windy weather as prime bushfire conditions. “Everyone’s got a role to play,” he …