That’s a good question in regards to the cold. The FarmBot is designed to be weatherproof with all of the electronics being housed in a weatherproof box so wet conditions are not an issue.
I do know that circuit boards have the potential to get damaged after 35F/1.7C since the low temperatures can “flex” or cause the board to shrink.
EDIT: After a quick search about operating temperatures I did find this
"The Raspberry Pi is built from commercial chips which are qualified to different temperature ranges; the LAN9512 is specified by the manufacturers being qualified from 0°C to 70°C, while the AP is qualified from -40°C to 85°C. You may well find that the board will work outside those temperatures, but we’re not qualifying the board itself to these extremes"
but the quote above is specifically speaking about the Raspberry Pi.