Talk:Heating degree day

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There are more differences between US and UK practice than just the Fahrenheit/Celsius dichotomy. In the US, for heating degree days, the daily temperature deficit is always just the simple difference between mean and base temperatures. In UK practice, different formulae are used when the maximum, mean, or minimum temperature respectively exceed the base temperature (similar considerations apply to cooling degree days).

Another issue is the choice of base temperature. UK conventions for heating are 18.5, 15.5 and 10.0 Celsius, while cooling figures are customarily published to bases of 15.5 and 5.0 Celsius. Other countries have their own conventions.

Incidentally I think there is a mistake in the article regarding temperature conversion. Because degree days are accumulated temperature differences we only need to scale them by 5/9 or 9/5. No need to worry about the 32 F Vilnis 22:06, 17 January 2007 (UTC)[reply]

Vilnis 18:43, 16 April 2006 (UTC)[reply]

Agreed on the formula, I went ahead and changed it.--76.10.128.59 (talk) 08:31, 17 November 2007 (UTC)[reply]

I think the formula example for HDD is a bit hard to follow. Though it is correct, it doesn't seem to convey the fact that you're working with a difference. (18 - 4) + (18 - (-2)) + (18 - (-4)) seems much clearer. —Preceding unsigned comment added by 165.91.212.100 (talk) 19:59, 8 January 2008 (UTC)[reply]

Average Daily Temp = ???

I was looking for clarification of a point that is typically glossed over with a hand-wave. "The HDD is THE difference between THE daily Temp (or THE Average Daily Temp) vs a standard Base-Temp." Okay, What is THE daily Temp?

We know temperature varies, (at times above and below the Base-Temp). However we usually only get two daily (Max, Min) historical values. Given hourly readings I assume - - - Now, I'm again confused, I can imagine several averaging (integrating) possibilities.

I can't edit this, as I'm still confused about what I was hoping Wikipedia would clarify explicitly.

Thanks, HalFonts (talk) 23:45, 13 June 2009 (UTC)[reply]

I just added a simple numeric example for New York City, clarifying average, daily, monthly and annual HDD values. These are often poorly defined in tabular weather data.

The problem with this example is that the units are in Fahrenheit but everything else in the article seems to be done properly with SI. This plus the US maps make it seem quite Americentric. —Preceding unsigned comment added by 142.104.154.108 (talk) 21:34, 30 March 2010 (UTC)[reply]

HalFonts (talk) 03:54, 4 August 2009 (UTC)[reply]

Why not call it the mean daily temperature and give an example?

(fotoguzzi) 69.64.235.42 (talk) 03:05, 18 December 2009 (UTC)[reply]

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