In some cases you can use a fixed scale to facilitate an easy understanding of your data.
Wind direction should for example in most cases be displayed on a fixed scale from 0-360. Relative humidity should likewise be displayed on a fixed scale from 0-100.
Setting a fixed scale in Historical Data is done in the Page Setup by choosing Manual in the scale settings.
Setting a fixed scale in the Dashboard is done by unchecking Auto Scale in the Axis Settings.