Author Topic: Daily Average Temperatures  (Read 420 times)

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Offline WeatherHost

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Daily Average Temperatures
« on: March 28, 2018, 05:33:22 AM »
They really need to do that differently.

We were between 56 and 58 almost all day yesterday.  Only 5 of the hourly observations recorded were 60 or above.  One was recorded at 70 and the official high was recorded at 71 which apparently was only for a few minutes since the next hour dropped back to 59.  Yet the official high and low were 71 and 55 for an average of 63 or 11 above normal.  One of the hourly observations was 63 and only 4 out of 24 were above that.

Also, I never saw above 65 on my console, about 40 air miles from the NWS Office.  The front stalled between us.

By all common sense, our average daily temperature was more like 57 or 58.

This is a big part of how 'normals' are getting skewed over time.

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Offline WeatherHost

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Re: Daily Average Temperatures
« Reply #1 on: March 28, 2018, 05:42:35 AM »
The 24 hourly observations total 1425, then divided by 24 equals 59.38

That's still above the 'normal' for the day which is 52, but only 7 degrees, not 11.





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Offline spc fresno

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Re: Daily Average Temperatures
« Reply #2 on: May 29, 2018, 02:14:29 PM »
Maybe they should use the Median Temperature, rather than the mean. I agree, that if that particular date has an outlier, it shouldn't have such a large effect on the total day average. The median would make it so that if a given temperature range dominated during the 24 hours, it would likely be towards the middle of all the numbers, lined up lowest to highest.

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Offline SupaWX

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Re: Daily Average Temperatures
« Reply #3 on: June 01, 2018, 06:24:36 PM »
I used to calculate the daily mean and median, but 99% of the time they were within a degree of each other so I stopped doing the median.

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