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Heat/cold degree days and Chill hours: Difference between revisions
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Heat/cold degree days and Chill hours (view source)
Revision as of 15:28, 11 June 2021
, 15:28, 11 June 2021→Calculation of Chill Hours
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One applicability is to stone and seed fruit as their exposure to low temperatures during the winter months will have a significant effect on the following harvest. Too few cold hours can result in poor quality and quantity of the crop. Fruit tree varieties prefer a Chill Hour rating from about 200 hours to around 1500 hours. | One applicability is to stone and seed fruit as their exposure to low temperatures during the winter months will have a significant effect on the following harvest. Too few cold hours can result in poor quality and quantity of the crop. Fruit tree varieties prefer a Chill Hour rating from about 200 hours to around 1500 hours. | ||
On Cumulus that threshold | On Cumulus that threshold is the default, so you simply observe the reported value at the relevant time on 30 April/1 May in Northern hemisphere. | ||
To use a different threshold add ''ChillHourThreshold=x.x'' to [[Cumulus.ini_(Cumulus_1)#Section:_Station| station section in Cumulus.ini_(Cumulus_1)]] where x.x is the temperature you want in your normal Cumulus temperature units. Use ''ChillHourSeasonStart=mm'' in [[Cumulus.ini_(Cumulus_1)#Section:_Station| station section in Cumulus.ini_(Cumulus_1)]] where mm represents month number (1=January, 12=December) to change the season start. The current figure is viewable on the 'This Year' screen accessed from the View menu (only when the current year is selected), stored in [[today.ini]], and is available via web tag <#chillhours> to be seasonal or longer period added to a web page template of your design. | |||
Should you miss checking the reported value on 1 May, then for a few days, you can look in the backup sub-folder for the necessary archived today.ini. In the final 1.9.4 version of Cumulus 1, a new archive of the data sub-folder is taken just after each rollover, but note that Chill hours are counted in Cumulus by calendar day (therefore some interpolation is needed if your rollover is 9am/10am). From release 3.10.0, the backup reverted to at end of day as in early Cumulus 1 software versions. | |||
[[User:Sfws|Sfws]] 10:53, 1 December 2012 (UTC) (with thanks to Randy who raised [https://cumulus.hosiene.co.uk/tracker.php?p=1&t=117| Enhancement Request #117] and supplied some of the above text) | [[User:Sfws|Sfws]] 10:53, 1 December 2012 (UTC) (with thanks to Randy who raised [https://cumulus.hosiene.co.uk/tracker.php?p=1&t=117| Enhancement Request #117] and supplied some of the above text) | ||
Updated for MX 15:28, 11 June 2021 (UTC) [[User:Sfws|Sfws]] ([[User talk:Sfws|talk]]) | |||
=== Air Frost === | === Air Frost === | ||
