Funny, that is what the weather station manual says. However on the pages selling the sensor (thgr-268) it says
"Outdoor temperature range: -23.0F to +122F Outdoor temperature range: -58.0F to +140F with lithium batteries installed in remote sensor (available below)"
I know I have used my shack and stock sensor down to -25c (-13f) (verified by metar and analog thermo)
I got a "cold weather "thgn123nx" but have not installed because my current shack one is performing well.
It is rated at -40f with lithium. which is strange since the regular says -58 with lithium? Perhaps the ambient page for 268 is wrong. The actual sensor manual for 268 says this ": -30.0°C to 60.0°C
(-22.0°F to 140.0°F)"
All still have the dewpoint/humidity stop at -10C though.
Andrew
I believe the outside temperature is -4 F bottom limit (according to the OS and RS manuals).