Oaktree Weather Systems

Extra Sensors

Many current weather stations support additional sensors and these can be included in the Interface console. To do so you need to enable the required sensors in the Settings ~ Extra Sensors page. Once enabled, CumulusMX will generate current readings for them. As of version 4.6.4, build 4126 no provision is made to record extreme values over any period of time. Note This does not mean it is not possible to generate these yourself, but to do so requires that you store the current readings in some way and then devise a way to extract the required values.

Extra sensor data is from 'Davis', 'Ecowitt', 'Fine Offset' and the supported 'Oregon Scientific'These are WMR928 and WMR100/200 stations.

Webtag name	Alternative	Sensor Note The related description can be changed in 'settings ~ Locale Strings'
<#ExtraTemp[1 - 16]>	<#ExtraTemp sensor=[ 1 - 16 ]>	Extra temperature channel 1 - 16, both webtag syntaxes are valid
<#ExtraDP[1 - 16]>	<#ExtraDP sensor=[1 - 16]>	Extra dew point channel 1 - 16, both webtag syntaxes are valid
<#ExtraHum[1 - 16]>	<#ExtraHum sensor=[1 - 16]	Extra humidity channel 1 to 16.
<#SoilTemp[1 - 16]>		Soil temperature 1 - 16
<#SoilMoisture[1 - 16]>		Soil moisture 1 - 16
<#LeafWetness[1 - 8]>		Leaf wetness 1 - 8

Davis AirLink

You can configure two Airlink devices which have fixed identification as Indoor and Outdoor. There are a similar set of tags for each device.

Filter: Choose your search criteria carefully

Webtag name	Function
Particulate Matter
<#AirLinkPm1[InǀOut]>	Current particulate matter of 1 μm, or less count
<#AirLinkPm2p5[InǀOut]>	Currentparticulate matter of 2.5 μm, or less, count
<#AirLinkPm2p5_1hr[InǀOut]>	Last hour average particulate matter of 2.5 μm, or less, count
<#AirLinkPm2p5_3hr[InǀOut]>	Last 3 hours average particulate matter of 2.5 μm, or less, count
<#AirLinkPm2p5_24hr[InǀOut]>	Last 24 hours average particulate matter of 2.5 μm, or less, count
<#AirLinkPm2p5_Nowcast[InǀOut]>	The 24 hour nowcast weighted average particulate matter of 2.5 μm, or less, count
<#AirLinkPm10[InǀOut]>	Current particulate matter of 10 μm, or less, count
<#AirLinkPm10_1hr[InǀOut]>	Last hour average particulate matter of 10 μm, or less, count
<#AirLinkPm10_3hr[InǀOut]>	Last 3 hours average particulate matter of 10 μm, or less, count
<#AirLinkPm10_24hr[InǀOut]>	Last 24 hours average particulate matter of 10 μm, or less, count
<#AirLinkPm10_Nowcast[InǀOut]>	The 24 hour nowcast weighted average particulate matter of 10 μm, or less, count
Air Quality Index Values (allows use of the “dp=n” and “tc=y” parameters)
<#AirLinkAqiPm2p5[InǀOut]>	Current particulate matter of 2.5 μm, or less AQI
<#AirLinkAqiPm2p5_1hr[InǀOut]>	Last hour average particulate matter of 2.5 μm, or less, AQI
<#AirLinkAqiPm2p5_3hr[InǀOut]>	Last 3 hour average particulate matter of 2.5 μm, or less, AQI
<#AirLinkAqiPm2p5_24hr[InǀOut]>	Last 24 hour average particulate matter of 2.5 μm, or less, AQI
<#AirLinkAqiPm2p5_Nowcast[InǀOut]>	Last 12 hour nowcast weighted average particulate matter of 2.5 μm, or less, AQI
<#AirLinkAqiPm10[InǀOut]>	Current particulate matter of 10 μm, or less
<#AirLinkAqiPm10_1hr[InǀOut]>	Last hour average particulate matter of 10 μm, or less, AQI
<#AirLinkAqiPm10_3hr[InǀOut]>	Last 3 hour average particulate matter of 10 μm, or less AQI
<#AirLinkAqiPm10_24hr[InǀOut]>	Last 24 hour average particulate matter of 10 μm, or less AQI
<#AirLinkAqiPm10_Nowcast[InǀOut]>	Last 12 hour nowcast weighted average particulate matter of 10 μm, or less AQI
Stats Values
<#AirLinkPct_1hr[InǀOut]>	Percentage of filling of the 1 hr averages buffer
<#AirLinkPct_3hr[InǀOut]>	Percentage of filling of the 3 hr averages buffer
<#AirLinkPct_24hr[InǀOut]>	Percentage of filling of the 24 hr averages buffer
<#AirLinkPct_Nowcast[InǀOut]>	Percentage of filling of the nowcast 12 hr averages buffer (2 hrs are required to get a nowcast value)
Sensor Info
<#AirLinkFirmwareVersion[InǀOut]>	Shows the AirLink firmware version as a date string. NOTE This web tag requires a WeatherLink Pro subscription to work.
<#AirLinkTemp[InǀOut]>	The sensors internal air temperature value
<#AirLinkHum[InǀOut]>	The sensors internal air humidity value
<#AirLinkWifiRssi[InǀOut]>	The sensors WiFi signal strength in dB - anything below -90 is considered very poor. NOTE This web tag requires a WeatherLink Pro subscription to work.
<#AirLinkUptime[InǀOut]>	Shows the AirLink Uptime [InǀOut] as a date string.
<#AirLinkLinkUptime[InǀOut]>	Shows the AirLink Link Uptime [InǀOut] as a date string.

The extra sensors functionality in Cumulus only supports processing for current spot values as read from the sensors. Periodically spot extra sensor values are logged, see the Extra Sensor Files page for information about log files from where you can extract the past spot values. The logging can be compared to the Standard Logfiles. Extra Sensors: Davis models and Oregon Scientific WMR928, WR100/200 and Ecowitt These web tags hold current values for additional sensors supported by CumulusMX. For Oregon Scientific model like WMR-200 with USB connection, please refer to #Web tags mentioning (outside) temperature because any of the extra temperature tags below can be redirected to <#temp>, and consequently also have web tags reporting daily extremes and longer period extreme records. The webtags are shared between the devices and it is the users responsibility to avoid conflict.

Ecowitt

Ecowitt stations are sold under other names depending on nation, e.g. Ambient in USA, Froggit in central Europe, so Ecowitt is used as a generic name in this Wiki. See also WXForum.net.

WH45 CO₂ sensor

Filter: Choose your search criteria carefully

Webtag name	Function
<#CO2>	The actual CO2 concentration in ppm
<#CO2_24h>	The CO2 concentration in ppm. 24hr rolling average
<#CO2_pm1>	Air Quality expressed in terms of particulate matter of 1 μm/m3
<#CO2_pm1_24h>	Air Quality expressed in terms of particulate matter of 1 μm/m3 24hr rolling average
<#CO2_pm2p5>	Air Quality expressed in terms of particulate matter of 2.5 μm/m3 or less
<#CO2_pm2p5_24h>	Air Quality expressed in terms of particulate matter of 2.5 μm/m3. 24hr rolling average
<#CO2_pm2p5_aqi>	The air quality index calculated from the CO2 sensors current pm 2.5 value
<#CO2_pm2p5_24h_aqi>	The air quality index calculated from the CO2 sensors pm 2.5. 24hr rolling average
<#CO2_pm4>	Air Quality expressed in terms of particulate matter of 4 μm/m3 or less NOTE: probably - but uncertain - a derivative by Ecowitt (interpolation between 2.5 and 10?)
<#CO2_pm4_24h>	Air Quality expressed in terms of particulate matter of 4 μm/m3, or less, 24hr rolling average
<#CO2_pm10>	Air Quality expressed in terms of particulate matter of 10 μm/m3, or less (includes the 2.5 figure)
<#CO2_pm10_24h>	Air Quality expressed in terms of particulate matter of 10 μm/m3, or less, 24hr rolling average
<#CO2_pm10_aqi>	The air quality index calculated from the CO2 sensors current pm 10 value
<#CO2_pm10_24h_aqi>	The air quality index calculated from the CO2 sensors pm 10 24hr rolling average
<#CO2_temp>See note	Temperature as reported by Air Quality monitor.
<#CO2_hum>	Relative Humidity as reported by Air Quality monitor Note This temperature reflects the temperature of the sensor and would be used in combination with the sensors measured humidity (see next) for correction of the measured PM (particulate matter) value. This correction is responsibility of the user and is subject to a lot of discussion. Determination of how to correct the PM value is highly dependent on the conditions and placement of the sensor. See the specification sheet for the sensor or create some multivariate regression line based on calibration measurements. This is also valid for PM sensors like the AirLink. The normal amateur usage of PM sensors is that the uncorrected values are published.

WN34 soil and water sensor

Cumulus MX can support the Ecowitt WN34 soil and water temperature sensors. They are reported as “User Temperature 1” to “User Temperature 8” (Note Other model types exist and are reported here as if WN34.).

Webtag name	Function
<#UserTemp[1 - 8]>	The temperature of the sensor

Extra Sensors

Below are the tags resulting from Ecowitt Air quality (WH41,WH43,WH45), Ecowitt leak sensor (WH55), lighting detector (WH57), and extra temperature sensors (WN34)

This sub-section applies only to those using Ecowitt GW1000 and possibly other devices (also Froggit DS1500, and other equivalents, see Supported Devices)an interface unit that picks up various external sensors and sends the data via an application programming interface to CumulusMX which then generates the following web tags:.

Webtag name	Function Note These do not work with the GW1100 gateway and NO parameters are allowed.
<#GW1000FirmwareVersion>	GW1000 firmware version string. Note Returns “???” if not available.
<#EcowittFirmwareVersion>	Ecowitt firmware version string. Note Returns “???” if not available..
<#EcowittReception>	Reception signal strength for the Ecowitt devices in use. Note Returns “???” if not available.
<#EcowittCameraUrl>	The URL for the HTTPS GET command to get the camera picture. Note Returns “???” if not available.
<#EcowittVideoUrl>	The URL for the HTTPS GET command to get the camera timelapse for yesterday (no older timelapses can be viewed through CumulusMX). Note Returns “???” if not available.

Webtag name	Function NOTE The related description can be changed in 'strings.ini', but below are default descriptions that will be shown in the viewer/editor
<#LeakSensor[1 - 4]>	Unknown at time of writing November 2025
<#UserTemp[1 - 8]>	User Temperature [1 - 8]
<#SoilMoisture[1 - 8]>	Soil moisture [1 - 8]
<#LaserDist[1 - 4]>	To be clarified later
<#LaserDepth[1 - 4]>	To be clarified later
<#AirQuality[1 - 4]>	Air quality in μm/m3
<#AirQualityAvg[1 - 4]>	24 hr moving average Air quality in μm/m3
<#AirQualityIdx[1 - 4]>	The calculated air quality index for sensors 1 to 4
<#AirQualityAvgIdx[1 - 4]>	The calculated 24 hour average air quality index for sensors 1 to 4
<#LightningDistance>	Distance to last strike Note Uses the same units as wind run. If no sensor available or no strikes recorded it returns 0.0. Technical note If no sensor is fitted or no strikes recorded since fitting, the Ecowitt api returns max value you can put in a byte - 0xFF which translates to 158.4 miles = 255 km. In this scenario, CumulusMX translates this to '—-'.
<#LightningTime>	Date and Time of last strike. Note With no output parameters, CumulusMX outputs the locale's short time format e.g. 18:02 or 6:02 pm, without date. The Webtag accepts both date and time output parameters. If you don't have a sensor, or no strike has been recorded it returns '—-'.
<#LightningStrikesToday>	Number of lighting strikes today

Table of Contents

Extra Sensors

Davis AirLink

Ecowitt

WH45 CO₂ sensor

WN34 soil and water sensor

Extra Sensors