While the default configuration for the
LPC1114 802.15.4 Wireless Transceivers is limited to -10°C-70°C, you can extend this to -40°C-70°C by adjusting the parts selection, though like most things in engineering there are always tradeoffs. We just added a
Standard and Alternate Part List page for these boards that lists the key data for all of the parts used, and shows the importance of paying attention to every part you chose since you'll always be limited by the weakest link in your part list. It's always worthwhile making a table like this to see where you can make small improvements depending on the exact requirements you have.