Snow depth chart card with background

Who it’s for

City road maintenance crews, ski resort operators, and avalanche risk assessors ask “how has snow depth changed over the selected period?” They want the trend and delta in one card displayed over a background image for field station or control-room screens.

What it does

A sensor averaging 22 cm this week versus 8 cm last week shows a dark-blue value — Moderate — with a +175% delta and a +14 cm absolute change, plus a chart of readings, displayed over the preset background image.

• Large current snow-depth value color-coded across six bands from Trace to Extreme
• Delta percentage and absolute delta comparing the current period to the previous one
• Time-series chart of snow-depth readings averaged per interval
• Decorative background image bundled with the widget, with a white overlay that keeps the text readable
• Shows one sensor’s data; it does not compare multiple gauges

How to set up

Data keys

Key	Role	Type	Description
snow	Chart series	Timeseries	Snow depth in cm; drives the chart and all derived overlays
Latest	Latest value	Timeseries	The headline figure above the chart. Its own color ranges are where the band colors are edited
Delta percent	Percentage change	Timeseries	Change against the previous period, as a percentage
Delta absolute	Absolute change	Timeseries	Change against the previous period, in the key’s own unit

The widget ships with a simulated function datasource key labeled Snow depth, so it draws random values until you point the datasource at a device and rename the key.

To point it at your own device: open the dashboard in edit mode, open the widget’s Datasources, pick the entity or entity alias, and replace the function key with the key your device reports.

If the key has never reported for the selected time window, the chart is empty and all overlays show no data.

Value ranges

Range (cm)	Level	Color
0–1	Trace	Light Blue
1–10	Light	Medium Blue
10–30	Moderate	Dark Blue
30–60	Deep	Deep Blue
60–90	Very Deep	Orange
90+	Extreme	Red

How to customize

• To swap the background image — open the widget settings and set Background to a different image or switch to a solid color.
• To adjust how much the background shows through — change the Overlay opacity; lower values reveal more of the image, higher values push it further back.
• To use your own snow-depth thresholds — edit the color ranges on the Latest data key; adjust the six default bands to match your operational thresholds.
• To change the comparison period — adjust the Time window on the dashboard; the delta automatically compares to the equivalent preceding period.
• To hide or show the chart — toggle Show chart in the widget settings.
• To change the chart line color — set Chart color.
• To hide the entity name subtitle or the timestamp — turn off Show subtitle or Show date.

Tips

• Switch the legend aggregation to max to show the peak depth recorded in the selected window rather than the average.
• If the background image reduces contrast, raise the Overlay opacity to keep the text readable from a distance.
• A large positive delta over 24 hours signals a significant snowfall event; a large negative delta suggests compaction or melting — cross-check with temperature data.