A kayaker friend gave us a similar rule last summer; I think it was 120F, as sholio says, but I can't remember for sure.
The C/F conversion mnemonics I use all the time are 16C = 61F and 28C = 82F (memorable because they're mirror images) and 22C= 72F (memorable because they both end in 2). Also -40C = -40F, memorable because it's horrifying, and also it was relevant last week, aiee.
no subject
A kayaker friend gave us a similar rule last summer; I think it was 120F, as
The C/F conversion mnemonics I use all the time are 16C = 61F and 28C = 82F (memorable because they're mirror images) and 22C= 72F (memorable because they both end in 2). Also -40C = -40F, memorable because it's horrifying, and also it was relevant last week, aiee.