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Rain measurement: Difference between revisions
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*When the temperature is close to or below freezing, rain may fall on the funnel and freeze or snow may collect in the gauge and not permit any subsequent rain to pass through. | *When the temperature is close to or below freezing, rain may fall on the funnel and freeze or snow may collect in the gauge and not permit any subsequent rain to pass through. | ||
= Precipitation measurement and Cumulus = | |||
Different weather stations report different rainfall observations, see [[Monthly_log_files]] for the parameters that Cumulus tracks. 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. | |||
On the Cumulus '''View''' menu ''This month/period/year'' screens you can see (excludes current meteorological day): | |||
* Total for period/month/year (also available from [[Webtags]]) | |||
* Wettest day (equivalent to Highest Daily Rainfall parameters of webtags) | |||
* High rain rate | |||
* Rain days (count of days with rainfall above configured threshold) | |||
* Dry days (count of days with rainfall below configured threshold) | |||
* Days with snow falling | |||
* 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, this month, and this year; totals | |||
* For today, yesterday, this month, this year, month-by-month, and all time; hourly/daily rainfall highs, rain rate high | |||
* Snow depth for current day | |||
* 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) | |||
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 = | = Types of Rain Gauge = | ||
Types of rain gauges include graduated cylinders, weighing gauges, tipping bucket gauges, optical, and simple buried pit collectors. Each type has its advantages and disadvantages for collecting rain data. | Types of rain gauges include graduated cylinders, weighing gauges, tipping bucket gauges, optical, and simple buried pit collectors. Each type has its advantages and disadvantages for collecting rain data. | ||