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Heat/cold degree days and Chill hours: Difference between revisions
Heat/cold degree days and Chill hours (view source)
Revision as of 13:38, 30 November 2012
, 13:38, 30 November 2012Setting the thresholds
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So if for each day of June, there were 3 hours above the threshold, the total for the month would be 90 hours reported as 3 days. | So if for each day of June, there were 3 hours above the threshold, the total for the month would be 90 hours reported as 3 days. | ||
=Setting the threshold= | =Setting the threshold= | ||
[[File:NOAA_Setup_extract.jpg]] | [[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 values in '''Cumulus\Cumulus.ini'''. | ||
CAUTION: Think carefully, about what threshold to use. If you later change the threshold, only subsequent calculations use the new threshold. All retrospective calculations remain based on the old threshold, so values shown for a month or a year with a threshold change will be rubbish, and need to be manually recalculated. | CAUTION: Think carefully, about what threshold to use. If you later change the threshold, only subsequent calculations use the new threshold. All retrospective calculations remain 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, and need to be manually recalculated. The figures are on the reports, so make any edits directly on past reports. | ||
The '''Chill Hours defaults''' are configurable by adding entries to the [Station] section in Cumulus.ini: | |||
ChillHourSeasonStart=10 | |||
ChillHourThreshold=45 | |||
The season start figure is the month number, and the temperature threshold is specified in the units that you use in Cumulus. | |||
The current figure is viewable on the 'This Year' screen, and is available via web tag <#chillhours> | |||
[[Category:Terminology]] | [[Category:Terminology]] | ||
<br> | <br> | ||
[[User:Sfws|Sfws]] 07:42, 29 November 2012 (UTC) | [[User:Sfws|Sfws]] 07:42, 29 November 2012 (UTC) | ||