Switchbot meter - random temperature spike

Haven’t noticed this occurring before. A random -7 C temperature spike captured by Home Assistant.
It’s not showing in the Switchbot app and I cannot spot anything obvious in the HA logs that might indicate what occurred.

Any ideas on how I can investigate please? Or how I may purge the erroneous value(s) so it doesn’t impact the long term statistics? I have nine of the Switchbot meter’s and it’s only present for a couple of them. One at 21:40 yesterday, the other at 19:10.