Since dropping to 27 degrees in late October, the Des Moines Airport has not stepped down below that level since. The featured chart presents the number of days each end of calendar year season that the low temperature set a new low for the season. The tally is started once the temperature dips below 50 degrees after 1 July. The blue bars represent the number of events prior to breaching 32 degrees and the red bars are the total for all events below 50. The chart shows that it takes around 5 events for the temperature to first reach 32 after dropping below 50 and the season total is around 10-15 events. The total so far (not shown) for this year is just seven events, so a number of colder nights appear probable prior to the first of the year. The first of these arriving Monday night with the coldest air of the season and highs on Tuesday struggling near freezing!

Voting:
Good = 19
Bad = 7
Abstain = 8

Tags:   lows