Clearly, Mark Twain hadn’t been to Denver when he famously said: “If you don’t like the weather in New England now, just wait a few minutes”.

After a 70 degree temperature drop in 34 hours, Denver ought to trademark Twain’s phrase.

Following a high temperature of 83 degrees on Wednesday afternoon, the mercury plummeted all the way down to a low of 13 degrees on Thursday night, marking a full 70 degrees temperature swing in just 34 hours.

That is now tied for Denver’s second-greatest two-day temperature change on record, based on a list of temperature changes from the National Weather Service in Boulder. It’s also the greatest October temperature change on record, and by a long shot.

The greatest two-day temperature drop came back in December of 2008, when temperatures fell 76 degrees from a high of 58 degrees on December 13 to a low of -18 on December 14. Denver’s next greatest temperature plunge came back in February 1933, when temperatures fell from a high of 60 degrees on February 5 to a low of -10 on February 6.

And that wasn’t all the bottoming the mercury did this week. Denver obliterated its daily record low temperature on Friday morning as well, with temperatures dropping to a low of at least 9 degrees, making it the coldest October morning since at least 1997.

An unusually powerful cold front – particularly for so early in the fall season – swept through Colorado on Wednesday, dropping temperatures to historic levels. Ahead of that front, warming, down-sloping winds spiked temperatures above 80 degrees on Wednesday afternoon.

Of course, by the weekend, temperatures will rebound back near 70 degrees by Sunday.

So if you don’t like Denver’s Friday freeze, just wait a few minutes.