Another quick estimation is to double the Celsius number and add 30.
Gets you close with very little brainpower.
Mike



jim rosinski wrote:
"Jose Vivanco" wrote:


I live in Ottawa, Canada and this is my first winter as a PA-28-140 owner.
My airplane does have copper battery cables (cable ?) and an engine heater
but the previous owner warned me; in really cold weather, below (-10C/-23 F)


-10C is actually +14F. The conversion formula is:

F = 9/5 C + 32

or

C = 5/9(F - 32)

It's helpful to remember a few points along the scale to get a quick
reference rather than having to do math in your head:

-40C = -40F
-18C = 0F
0C = 32F
10C = 50F
20C = 68F
30C = 86F

Jim Rosinski
N3825Q


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