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 Post subject: Chill Hours
PostPosted: Sun Jul 03, 2011 8:42 pm 
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Joined: Mon Jun 08, 2009 6:25 am
Posts: 335
Location: Wyndham Vale, Vic, Australia.
Weather Station: WH-1081 (Jaycar Digitech XC0348)
Operating System: XP SP3
I have installed the latest build (1.9.2 build 1000) over the 1.9.1 release.

I checked chill hours and noted a value of 0.5 for the default values.

I have added (For the Southern Hemisphere)
Code:
ChillHourSeasonStart=4
ChillHourThreshold=7
To the [Station] section of the cumulus.ini file while Cumulus was stopped, and when restarted, 'View|This year' still returns a value of 0.5 for chill hours.

The webtag <#chillhours> also returns the same value.
Is the returned value retrospective or is it only calculating it from when this build was installed.

Thanks

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 Post subject: Re: Chill Hours
PostPosted: Sun Jul 03, 2011 8:51 pm 
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Joined: Mon Jun 02, 2008 6:49 pm
Posts: 20279
Location: Sanday, Orkney
Weather Station: Davis VP2
Operating System: Windows Home Server 2011
werribee_au wrote:
Is the returned value retrospective or is it only calculating it from when this build was installed.

It starts counting from when you first run it. There isn't really any easy way to do it retrospectively (but yes, it could get an approximation by extracting data from the log files).

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 Post subject: Re: Chill Hours
PostPosted: Sun Jul 03, 2011 9:03 pm 
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Joined: Mon Jun 08, 2009 6:25 am
Posts: 335
Location: Wyndham Vale, Vic, Australia.
Weather Station: WH-1081 (Jaycar Digitech XC0348)
Operating System: XP SP3
steve wrote:
werribee_au wrote:
Is the returned value retrospective or is it only calculating it from when this build was installed.

It starts counting from when you first run it. There isn't really any easy way to do it retrospectively (but yes, it could get an approximation by extracting data from the log files).
Ah yes, I see the entry in the today.ini file.

Thanks Steve.

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 Post subject: Re: Chill Hours
PostPosted: Mon Jul 04, 2011 5:41 pm 
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Joined: Thu Aug 05, 2010 10:02 pm
Posts: 448
Location: GA, USA
Weather Station: WS2080
Operating System: W7
Gerard, do you have fruit trees?

Randy

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 Post subject: Re: Chill Hours
PostPosted: Tue Jul 05, 2011 8:19 am 
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Joined: Mon Jun 08, 2009 6:25 am
Posts: 335
Location: Wyndham Vale, Vic, Australia.
Weather Station: WH-1081 (Jaycar Digitech XC0348)
Operating System: XP SP3
Yes Randy I do!

Lemon (Don't know the variety), Granny Smith Apple (The sweetest ever for a Granny and about the size of a baseball) and a self sown Nectarine, All produce a great crop.. :clap:

Just took a picture of the last Granny I picked yesterday.


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 Post subject: Re: Chill Hours
PostPosted: Tue Jul 05, 2011 11:18 am 
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Joined: Thu Aug 05, 2010 10:02 pm
Posts: 448
Location: GA, USA
Weather Station: WS2080
Operating System: W7
This is my first year with a bearing Granny Smith tree. The apples want be ripe for sometime. I was surprised the new little apples start out red. Australia is the originators of a lot of good apple varieties as you know.

Randy

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 Post subject: Re: Chill Hours
PostPosted: Mon Oct 31, 2011 2:54 am 
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Joined: Mon Oct 31, 2011 2:44 am
Posts: 7
Location: United States
Weather Station: WS-1090
Operating System: windows XP sp3
I just recently installed Cumulus 1.9.2 to my new weather station.

1. How are Chill Hours calculated? My system has been up about 2 weeks on Wunderground, and today.ini shows 7.3481 chill hours. I'm sure it is incorrect, we have not dropped below 45 degrees yet here in Texas. Second, we have had a high above 80 since I have started the system, chill hours should have been removed from the count.

2. Is there a way to display chill hours from the system in Wunderground web page, or on the Cumulus screen on my PC? Is the only way to get the value to read the today file directly or to place the tag in HTML?

Thanks


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 Post subject: Re: Chill Hours
PostPosted: Mon Oct 31, 2011 7:46 am 
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Joined: Mon Jun 02, 2008 6:49 pm
Posts: 20279
Location: Sanday, Orkney
Weather Station: Davis VP2
Operating System: Windows Home Server 2011
jferristx wrote:
1. How are Chill Hours calculated?

It checks the temperature once a minute, and if it's below the threshold, it adds a minute to the Chill Hours total.
Quote:
My system has been up about 2 weeks on Wunderground, and today.ini shows 7.3481 chill hours. I'm sure it is incorrect, we have not dropped below 45 degrees yet here in Texas.

I'm reasonably sure the code is correct, no-one else seems to have an issue. Perhaps your station is giving false readings - Fine Offset stations commonly do. I'd need to see all of your data files, and the ChillHourThreshold setting from cumulus.ini.
Quote:
Second, we have had a high above 80 since I have started the system, chill hours should have been removed from the count.
Sorry, I don't understand, could you please explain? The Chill Hours figure has nothing to do with high temperatures, it just counts the period when the temperature was below a pre-set figure.
Quote:
Is there a way to display chill hours from the system in Wunderground web page

No, Wunderground has it's own fixed set of data and you can't change it.
Quote:
or on the Cumulus screen on my PC?

You can view the total on the 'This Year' summary screen.

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 Post subject: Re: Chill Hours
PostPosted: Mon Oct 31, 2011 11:33 am 
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Joined: Mon Oct 31, 2011 2:44 am
Posts: 7
Location: United States
Weather Station: WS-1090
Operating System: windows XP sp3
Thank you for the information. I don't suppose you can tell me the value? We measure chill hours as time between 45 and 32 degrees F, and if chill hours start accumulating and then the temp goes back ABOVE 60 degrees F, chill hours are subtracted. I'll assume the formula for Cumulus is not that complex?

And thanks for pointing out where to find them.....thought I looked at every screen.... :oops:


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 Post subject: Re: Chill Hours
PostPosted: Mon Oct 31, 2011 12:08 pm 
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Cumulus Author
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Joined: Mon Jun 02, 2008 6:49 pm
Posts: 20279
Location: Sanday, Orkney
Weather Station: Davis VP2
Operating System: Windows Home Server 2011
jferristx wrote:
Thank you for the information. I don't suppose you can tell me the value?

The default threshold is 7C or 45F. All time spent below this threshold contributes to the total, calculated once a minute.
Quote:
We measure chill hours as time between 45 and 32 degrees F, and if chill hours start accumulating and then the temp goes back ABOVE 60 degrees F, chill hours are subtracted. I'll assume the formula for Cumulus is not that complex?
I added the chill hour facility by request and implemented it as best as I could with the information I had. According to this page on Wikipedia - http://en.wikipedia.org/wiki/Chilling_requirement - only the 'Utah' model has the 'negative' effect that you describe; I have not implemented this, just the 'simplest' model.

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 Post subject: Re: Chill Hours
PostPosted: Tue Nov 01, 2011 11:49 am 
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Joined: Thu Aug 05, 2010 10:02 pm
Posts: 448
Location: GA, USA
Weather Station: WS2080
Operating System: W7
jferristx wrote:
Thank you for the information. I don't suppose you can tell me the value? We measure chill hours as time between 45 and 32 degrees F, and if chill hours start accumulating and then the temp goes back ABOVE 60 degrees F, chill hours are subtracted. I'll assume the formula for Cumulus is not that complex?

And thanks for pointing out where to find them.....thought I looked at every screen.... :oops:


jferristx, there are many, ways to calculate chill hours. The most widely accepted chill hour model is the simple, everything below 45F. This has been the model for many, many years. After doing quite a bit of research, the chill hours value given to fruit bearing trees, is often overstated and the majority of chill hour values is based on this model. The chill hour value for trees is more of a rule of thumb than a specific value.

The chill hour model you mentioned is one that is accepted in specific geographic areas but becomes inaccurate outside of these areas. Check with your local agriculture extension agent to find the model best suited for your area.

Since Cumulus is used world wide, the simple model works best for the largest number of users.

I hope this helps.

Randy

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 Post subject: Re: Chill Hours
PostPosted: Sun Nov 06, 2011 2:47 pm 
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Joined: Mon Oct 31, 2011 2:44 am
Posts: 7
Location: United States
Weather Station: WS-1090
Operating System: windows XP sp3
Many thanks for the explanation. The Utah model "might" be of issue where I live. It is not unusual to have 40-50 degree temp swings during a week. I save my data, next spring I'll run it against the other model and see if it makes much if any difference.


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