Pressure chart card

Who it’s for

Meteorologists, weather station operators, and building managers ask “how has pressure changed over the selected period, and is it rising or falling?” The direction of change matters as much as the absolute value — they want the current reading, a trend line, and a period-over-period delta in one card.

What it does

A sensor averaging 1008 hPa this period versus 1018 hPa last period shows a green value — Normal — with a -1% delta and a -10 hPa absolute change, indicating pressure has fallen and conditions may be deteriorating.

• Large current pressure value color-coded across three bands: Low (red), Normal (green), High (red)
• Delta percentage and absolute delta comparing the current period to the previous one
• Time-series chart of pressure readings averaged per interval
• Shows one sensor’s data; it does not compare multiple stations

How to set up

Data keys

Key	Role	Type	Description
pressure	Chart series	Timeseries	Atmospheric pressure in hPa; 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 Pressure, 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 (hPa)	Level	Color
< 1000	Low	Red
1000–1020	Normal	Green
> 1020	High	Red

How to customize

• To use your own pressure thresholds — edit the color ranges on the Latest data key; adjust the three default bands to match your operational limits.
• 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 show min, max, or total in the legend instead of avg — edit the Legend settings.
• To hide the entity name subtitle or the timestamp — turn off Show subtitle or Show date.

Tips

• A fall of 8–10 hPa over 3 hours is a strong indicator of an approaching storm — the chart’s slope is more actionable than the instantaneous value.
• Use this card when the period-over-period change matters. If you only need the trend shape without a delta, use the simple pressure chart card instead.