Every warmish day inspires media references to broken temperature records, the implicit message being that we have just endured further evidence of a planet in its sweaty death throes. Need it be said that those alarms should be taken with the usual grain of salt?
In late January, I was startled to hear the Nine News weather reporter breathlessly exclaim that a maximum of 33C in Sydney on the 21st of that month happened to be 7C above the city’s average January maximum. That’s it – 7C, for Heaven’s sake! My initial impression was that couching the report in those terms had been intended to add a global warming shock-and-awe angle to the report. After all, 7C is well above the 2C we are told is the magical figure beyond which we will all fry. Not that contrasting one day’s mercury with long-term records is an apples-to-apples comparison, but how many gullible warming believers would be capable of, or even bother, making this distinction?
My second reaction was to think that 33C doesn’t seem to me to be remarkably hot for January; neither did it strike me that 26C would be a likely average January maximum, so I had a look at Weatherzone. To my surprise it confirmed that the mean January maximum for Sydney is, indeed, 25.9C. So there you are. This is the long term mean maximum for January. The high mean maximum for January is actually 29.5C and that was recorded in 1896.
A closer examination of the data reveals that the figure of 7C on any particular day is not all that remarkable – so unremarkable, in fact, that it confirms my impression it was cited for purely propaganda reasons.
Sydney’s January high maximum is 45.8C and its low minimum is 10.6. So, historically, daily January temperatures in Sydney range over 35.2C. The maximum temperature on January 21 of 33C was actually 12.8C lower than the highest recorded January maximum.