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Calculate Missing Values: Difference between revisions
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Calculate Missing Values (view source)
Revision as of 07:37, 29 January 2021
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* '''Dew point''', a weather station might output dew point temperatures, but Cumulus can calculate it from source values for outdoor temperature and outdoor humidity | * '''Dew point''', a weather station might output dew point temperatures, but Cumulus can calculate it from source values for outdoor temperature and outdoor humidity | ||
** The original Cumulus and MX use different formulae to calculate dew point, so there is a continuity break if some of your data logs were created by the original Cumulus software and some by MX. | ** The original Cumulus and MX use different formulae to calculate dew point, so there is a continuity break if some of your data logs were created by the original Cumulus software and some by MX. | ||
*'''Wind Chill''', again this might be output by your weather station, but Cumulus can calculate it from outdoor temperature and average wind speed. | *[[Wind_chill|'''Wind Chill''']], again this might be output by your weather station, but Cumulus can calculate it from outdoor temperature and average wind speed. | ||
*[[Humidex|'''Canadian Humidity Index (Humidex)''']], [[Heat_index|'''USA Heat Index''']], and [[Apparent_temperature|'''Apparent Temperature''']] are not output by your weather station, but both the original Cumulus 1 and the newer Cumulus MX will derive these spot values for you (except if you are running a very old release) | *[[Humidex|'''Canadian Humidity Index (Humidex)''']], [[Heat_index|'''USA Heat Index''']], and [[Apparent_temperature|'''Apparent Temperature''']] are not output by your weather station, but both the original Cumulus 1 and the newer Cumulus MX will derive these spot values for you (except if you are running a very old release) | ||
**(The implementation of these by Cumulus software is briefly mentioned [[Feels_Like#Rest_of_this_article|here]]). | **(The implementation of these by Cumulus software is briefly mentioned [[Feels_Like#Rest_of_this_article|here]]). | ||
** The calculation formulae used for these may not be consistent for all releases, so again there is a possibility a data log might have continuity breaks. | ** The calculation formulae used for these may not be consistent for all releases, so again there is a possibility a data log might have continuity breaks. | ||
*[[Feels_Like|'''Feels Like Temperature''']] is calculated by the Cumulus MX flavour only, the actual calculation formula [[Feels_Like#The_various_ways_to_express_Feels_Like|has varied]] in different releases, but use a variation on | *[[Feels_Like|'''Feels Like Temperature''']] is calculated by the Cumulus MX flavour only, the actual calculation formula [[Feels_Like#The_various_ways_to_express_Feels_Like|has varied]] in different releases, but use a variation on | ||
*'''Heating Degree Days''' and '''Cooling Degree Days'''; these are further examples of derived values that most versions of Cumulus will calculate for you (from all processed outdoor temperatures in a day) | *[[Heat/cold_degree_days_and_Chill_hours|'''Heating Degree Days''' and '''Cooling Degree Days''']]; these are further examples of derived values that most versions of Cumulus will calculate for you (from all processed outdoor temperatures in a day) | ||
**A bug in some versions of the original Cumulus software could result in these derived values being swapped and therefore tracked wrongly when reporting extremes. | **A bug in some versions of the original Cumulus software could result in these derived values being swapped and therefore tracked wrongly when reporting extremes. | ||
