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Crazy September weather – Cooler with huge temperature swings

Tuesday, September 23rd, 2008 10:08am MDT

If you have been thinking that the weather this month has been a bit odd you are right!  It was pointed out to me by a reader recently just how much things have been out of kilter.  If you look at the table below you will see what we mean.

Date Normal High Official High * Departure
From Normal
Difference From
Previous Day
08/31 82 91 +9 +2
09/01 82 85 +3 -6
09/02 82 63 -19 -22
09/03 81 75 -6 12
09/04 81 74 -7 -1
09/05 81 54 -27 -20
09/06 80 68 -12 14
09/07 80 79 -1 11
09/08 80 52 -18 -27
09/09 79 86 +7 34
09/10 79 80 +1 -6
09/11 79 63 -16 -17
09/12 79 61 -18 -2
09/13 78 74 -4 13
09/14 78 62 -16 -12
09/15 78 73 -5 11
09/16 77 80 +3 7
09/17 77 81 +4 1
09/18 77 79 +2 -2
09/19 76 76 0 -3
09/20 76 79 +3 3
09/21 76 77 +1 -2
09/22 75 87 +12 10

As you can see, we have had eight days thus far in September with temperatures 10 degrees or more above or below normal.  Seven of those eight were below normal, six of those were 15 or more degrees cooler than usual.  We had one day, the 5th, when we the mercury only climbed to 54 degrees – a whopping 27 degrees below what we would normally expect. 

That in and of itself is noteworthy but also notice the temperature swings from day to day.  12 days we have had temperature swings of 10 degrees or more.  Four of those days had swings of 20 degrees or more!  On the 8th we dropped 27 degrees from the previous day and were 18 degrees below normal.  We then followed that up on the 9th by climbing 34 degrees above what we had on the 8th and were 7 degrees above normal. 

Now that is some weird weather and if you feel like things have been going up and down – you are right! 

Special thanks to David Canfield of Thornton for accumulating the data and bringing this to our attention!

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