So what happens at 3pm, 6pm and 9pm? The results below show is.
Temperature at 3pm showed a significant increase. (t = 3.8, p < 0.01)at a rate of 0.85 degrees Celsius per 100 years. The graph shown below of this, despite a bit of variability is strong, significant and obvious.
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However temperatures at 6pm proved not to show a significant increase (t = 0.37, p = 0.7) as shown on the graph below.
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The last 5 years have shown above normal temperatures at 6pm, but the overall trend is not significant and not clearly obvious to the eye.
Simiralily at 9pm there as been no significant increase in temperature (t = 1.4, p = 0.15). Although it has to be noted on the graph below, that like 6pm, the last 5 years have all seen greater than normal temperatures at this time.
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So we've shown that Australia is only heating up at times when the sun is making an impact, that is from 9am till 3pm. Both 6pm and 9pm temperatures have seen increases, but they are not significant. Overnight temperatures are not moving either way.
So how come therefore we see increases in minimum temperature when overnight temperatures are not increasing? Isn't the minimum temperature meant to be an accurate measure of overnight temperature? We'll show you in the next article, that not only is the minimum a poor measure of overnight temperatures, that there could possibly be some big irregularities with the minimum temperature before the mid 70s and after.