A four-degree temperature rise by 2050: That's the worst-case scenario facing the residents of Macquarie, named as one of the 20 federal electorates most at risk from climate change.
A study commissioned by the Australian Conservation Foundation and carried out by experts from the Australian National University compared 1960-1990 historical averages to projections for 2050.
Macquarie ranked number 11 with the projected temperature increases ranging from 3.9 degrees at Springwood to 4.2 degrees at Katoomba and Mt Victoria.
Summers would be like the record-breaking one just experienced and winter snow a thing of the past.
The ANU team emphasised that it was a "worst-case scenario" which could be avoided if cuts to climate pollution were made.
Macquarie MP, Susan Templeman, said the findings highlighted the urgent need for action on climate change.
"Not acting is not an option," Ms Templeman said.
"We already know the devastating effects of prolonged summers. It was the spring of 2013 that caused havoc in the Blue Mountains, with fierce and unprecedented bushfires.
"Globally, the last five years were the hottest on record. And in Australia, 2018 saw 209 weather records beaten."
Ms Templeman said the Labor Party had announced a comprehensive climate change action plan.
"That's something we're very proud of. Labor has done the work, we've listened to business and we've listened to science."
Labor policies include investment in renewable energy and batteries to generate 50 per cent of power from renewables by 2030 and cut power bills, and to boost recycling and reduce waste and plastics while creating new globally competitive industries.
Greens candidate for the federal seat, Kingsley Liu, said the solution was "solar galore" and the low density development of the Mountains could help.
"We have lots of roof tops gazing at the sun that can help us be wholly solar powered and build local industries including eco-tourism.
"Not only will our energy costs drop through the floor but there will be energy to spare to sell back to the grid. It will be a money-maker.
"We could re-invest the profits in increased capacity, storage and electric cars," he said.
The researchers acknowledged that climate modelling worked better at global and regional scales and that a more localised study, such as in this case, "comes with higher uncertainty".
But they added: "While there is some uncertainty in any climate model projections, overall trends are consistent: Australia will be significantly hotter and face more frequent and intense extreme weather because of worsening climate change."
The Gazette was waiting to hear from the Liberal candidate for Macquarie, Sarah Richards.
The worst electorate was Groom, centred on Toowoomba west of Brisbane, which could see a 4.77 temperature rise.
