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Rain measurement: Difference between revisions
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= Precipitation measurement and Cumulus =
Cumulus processes rainfall in one of two [[cumulus.ini| units]] (millimetres and inches). Most processing by Cumulus is based on the total rainfall count output by a weather station, see [[FAQ#My_station_invented_some_rain_that_didn.27t_really_occur.2C_and_I_want_to_set_it_to_zero_.28or_some_other_figure.29 | FAQ]] for more. The rainfall observations output by different weather stations varies, see [[Monthly_log_files]] for the parameters that Cumulus tracks. Cumulus can also read rainfall from a separate RG11 optical gauge.
== Rain day ==
The threshold value which the daily rainfall has to equal or exceed for the day to be considered a 'rain day' is set in [[Cumulus.ini#Section:_Station | RainDayThreshold]] and has a default value of ''-1'' that means 0.2mm or 0.01in. Alternative thresholds can be used by specifying a number in the units your configuration uses.▼
== Cumulus View Menu ==
=== Highs and Lows ===
* Wettest day (equivalent to Highest Daily Rainfall parameters of webtags)▼
On the Cumulus '''View''' ''Highs and lows'' screens you can see those of the following appropriate to the chosen period:▼
* Highest Hourly/Daily/Monthly Rainfall ▼
* High rain rate
* Longest wet period (count of consecutive days with rainfall above configured threshold)▼
* Longest dry period (count of consecutive days with rainfall below configured threshold)▼
These screens display the Highest or Longest extreme values for various rainfall categories; the same values are available from [[Webtags]].
=== ''This month/period/year'' screens ===
A number of values are shown for rainfall (all include start day, but exclude end day of period selected):
* Total for this (any) month
* Total for this (any) period you want (select start date included and end date excluded)
* Total for this (any calendar) year is shown on 'This year' screen
▲* Wettest day (equivalent to 'Highest Daily Rainfall' parameters of webtags)
* Rain days (count of days with rainfall above configured threshold)
* Dry days (count of days with rainfall below configured threshold)
* Days with snow lying
▲On the Cumulus '''View''' ''Highs and lows'' screens you can see those of the following appropriate to the chosen period:
▲* Highest Hourly/Daily/Monthly Rainfall
▲* High rain rate
▲* Longest wet period (count of consecutive days with rainfall above configured threshold)
▲* Longest dry period (count of consecutive days with rainfall below configured threshold)
==[[Webtags]] report ==
* For current, today, yesterday, and this month
* Annual rainfall web tag reports total for ''rainfall season'' year i.e. starting month set on Configuration | station screen | Annual rainfall frame; to see that figure use 'View menu | This period')
* For today, yesterday, this month, this year, month-by-month, and all time; hourly/daily rainfall highs, rain rate high
* Snow depth for current
* Longest wet period (count of consecutive days with rainfall above configured threshold)
* Longest dry period (count of consecutive days with rainfall below configured threshold)
* Timestamp of last rain gauge tip (and, from version 1.9.4, how many days ago)
* <#IsRaining> <#RG11RainToday> <#RG11RainYest> are available for Hydreon RG11 detectors only (the first applies to rain detection mode, the others apply to the tipping bucket mode)
▲The threshold value which the daily rainfall has to equal or exceed for the day to be considered a 'rain day' is set in [[Cumulus.ini#Section:_Station | RainDayThreshold]] and has a default value of ''-1'' that means 0.2mm or 0.01in. Alternative thresholds can be used by specifying a number in the units your configuration uses.
= Types of Rain Gauge =
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