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Calculate Missing Values: Difference between revisions
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** Due to this mismatch, the derived values (averages, highs, lows) this approach can store are much less accurate (hence getting missing lines from a backup is better)
= Derived spot values =
Cumulus software code as it reads source spot values, will detect if that source value is required for the calculation of an instant derived spot value.
Here are all the derived spot values that Cumulus can calculate (depending on Cumulus configuration settings, and what your weather station can output):
* '''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 legacy Cumulus 1, and CumulusMX, use [[Temperature_(and_humidity)_measurement#Cumulus_Calculated_Parameters|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 CumulusMX.
▲* '''Wet Bulb''', is only calculated by Cumulus 1, not MX
* [[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)
**
** 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
* [[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)
The links above will take you to where the derived values are explained in the [[:Category:Terminology]] pages of this Wiki, however at the time of writing this page, many of those links have very little information, so you may wish to search online to find more information in for example Wikipedia.
There are some configuration settings where you can decide whether to use a weather station supplied dew point temperature and whether to use a weather station supplied wind chill temperature, please see [[MX_Administrative_Interface#Changing_Settings]] and [[Cumulus.ini]] pages for how to find the settings.▼
▲There are some configuration settings where you can decide whether to use a weather station supplied dew point temperature and whether to use a weather station supplied wind chill temperature.
=Field Count Variations=
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