Chart builder

Every measurement tab draws a fixed chart with a fixed range switcher. The Build a chart tab lets a visitor draw their own: any mix of up to six measurements from your archive, in colours they pick, over any window up to 400 days. It is how someone answers a question the standard panels do not, such as how soil temperature tracked air temperature through a frost, or whether a pressure fall lined up with a rain burst.

It is off by default and is a Pro feature, because it needs the archive that Pro keeps.

Switching it on

Turn on Chart builder under Panels → Tabs & sections. It is a switch rather than a checkbox because it is a bigger decision than showing another panel: it opens your whole archive to be queried by anyone who visits, which is worth deciding rather than inheriting.

What a visitor can do

• Tick up to six measurements. Only measurements your station has reported within the last 400 days are offered, so a station without a solar sensor is never shown a solar series.
• Give each series its own colour. The starting colours match the fixed charts, and a visitor's own picks apply only to their chart.
• Set a from and to time, up to 400 days apart. The inputs are bounded by your oldest archived reading, and the tab opens on the last seven days.

Series are grouped the way the archive is: temperature (air, dew point, heat index, wind chill, wet bulb, indoor, daily high and low), humidity (outdoor and indoor), wind (average, gust and wind run), pressure (sea level and station), rain (amount, rate and storm total), sun (solar radiation, UV and evapotranspiration), air quality (PM1, PM2.5 and PM10), lightning, snow (depth and 24-hour snowfall), and every soil, leaf, room and probe channel your hardware supplies.

Measurements that share a unit share an axis, so two temperatures are drawn to the same scale and a temperature next to a pressure gets a second axis.

How the data is summarised

A short window is drawn from raw readings. Longer windows are bucketed so a chart never carries more points than a screen can show: hourly up to eight days, three-hourly to about a month, twelve-hourly to about three months, and daily beyond that. Each series is summarised the way its measurement demands: temperatures are averaged, gusts and rain rates take the bucket's maximum, rainfall and wind run are summed.

Values follow your site's unit system, and the times follow your station's time zone.

Next steps

• History, records & the almanac: the fixed charts and when their ranges unlock
• Tabs & panels