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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 11:14, 3 January 2013
, 3 January 2013→Setting the threshold: - mention of Cumulus NOAA report creator
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=Setting the threshold=
== Heat and Cold Degree Days for NOAA reports ==
[[File:NOAA_Setup_extract.jpg]]The thresholds for '''Heat and Cold Degree days''' are set in the ''NOAA Setup'' option within the ''Configuration'' menu. The picture shows just parts of the setup screen. It allows you to specify the two thresholds in the units you have selected to use in your implementation of Cumulus. Cumulus stores your selected threshold values in the
===CAUTION: Think carefully, about what threshold to use.===
CAUTION: Think carefully, about what threshold to use. If you later change the threshold, only subsequent calculations use the new threshold. All past calculations were based on the old threshold, so values shown on a NOAA report for a month or a year with a threshold change will be rubbish (the new threshold is shown on the report, but it has not been applied retrospectively), and need to be manually recalculated making any consequent edits directly on past reports.▼
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The View menu in Cumulus allows you to generate new NOAA reports for a month (or year). The new report will use the latest thresholds, and there is an option to save the new report (overwriting any previous one if you use the same name).
== Configuring Chill Hours ==
The '''Chill Hours defaults''' are configurable by adding entries to the [Station] section in Cumulus.ini:
''ChillHourThreshold=45''
The season start figure is the calendar month number (1 to 12), and the temperature threshold is specified in the units that you use in Cumulus.
[[Category:Terminology]]
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