Zargg
It's easy.
The temperature T in degrees Celsius (°C) is equal to the temperature T in degrees Fahrenheit (°F) minus 32, times 5/9:
T(°C) = (T(°F) - 32) × 5/9
or
T(°C) = (T(°F) - 32) / (9/5)
or
T(°C) = (T(°F) - 32) / 1.8
To use an example that makes it easy to understand
Convert 68 degrees Fahrenheit to degrees Celsius:
T(°C) = (68°F - 32) × 5/9 = 20 °C
lol... yeah I posted pretty much that same equation last year. I've gotten used to the F readout now though and only really get obsessive about it once I start "melting" (eg: anything above approx 85F/28C plus humidity).
I'd really like to get one of those floor unit air conditioners (the ones where you run a hose to a window and seal it up) but the way the windows are in here and the lack of room for the floor unit it just isn't really doable.
Also, although they've significantly dropped in price, they're still about $300 for a reasonably decent one... and that's totally ignoring the electricity costs to run it (which is not included in my rent).
So I just try to manage the temp in the apt in other ways... and when it gets too crazy I either sweat it out or just try to stop moving (if I start feeling sick).
:-)