A San Francisco winter? The mean daily minimum is something like 45F, it's more likely to have trouble overheating during the summer.
"The coldest winter I ever spent was a summer in San Francisco." -- Mark Twain
I suspect moisture damage from Karl The Fog rolling in every afternoon is more likely to kill it.
Less daily solar radiation to power/recharge the phone.
"The coldest winter I ever spent was a summer in San Francisco." -- Mark Twain
I suspect moisture damage from Karl The Fog rolling in every afternoon is more likely to kill it.