I’m a Denver-area-born Colorado resident of many years and this kind of variability in the “shoulder” seasons (spring and fall) is not uncommon along the Front Range.
We’re under Red Flag Warning (fire ban) and a winter storm watch at the same time. August was very dry in Denver and a tie for warmest August on record, going back to 1872. So far this summer, we’ve had 72 days of a high temp 90F or above - the record is 73, set in 2012. Most of the state is in drought conditions as well.
We have huge swings here which make it exciting! If I get good data from my station on the temperature swings I’ll post it here.