IEM Daily Feature
Friday, 22 July 2022

Dog Days of Summer

Posted: 22 Jul 2022 05:30 AM

The "Dog Days of Summer" is an interesting term that folks tend to classify the summer weather as, but it actually applies to the juxtaposition of the Sun and Sirius. Anyway, the analog to weather typically relates to it being too hot for even a dog or things are hot and lazy as a dog with each day being about the same as the last. So finally we arrive at the relevance for today's daily featured chart. The chart presents the frequency of 24 hour change in temperature by week of the year. The highest frequencies can be found during July and August around values close to zero, hence the propensity for each day to be more like the last than not. Of course the major driver of that consistency is humidity, which helps to moderate temperatures during the day and night time. July and August look mostly the same in this chart and so the "Dog Days of Summer" term can equally apply to both months in the weather sense!

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