There are several ways to do the sign for "temperature." They are all
based on old fashioned mercury thermometers. In the old days
thermometers were little glass tubes filled with mercury (a wickedly
dangerous liquid metal of which a few drops will absorb directly through
your skin and cause liver failure and brain death).
Temperature (version 1)
The right hand uses a "flat hand"
Temperature version 2:
Slide the right index finger up and down the side of the left index finger.
The right hand is in a palm-down "index finger" handshape
Side view: Notice the right finger is between the body and the left
Temperature (version 3)
I don't recommend this version because it looks so much like a "double
movement" of one of the versions of the sign for "tall."
But I include it here so you will recognize it if you see it.
The right index finger slides up and down the palm of left hand. Repeat.
TEMPERATURE (not recommended)
Years ago when I first posted this sign for "turn the thermostat up"
we used to use a lever to adjust a mechanical-type thermostat.
Thus we had a sign that mimed the setting of a thermostat. These
days "theremostats" are all electronic and controlled either through
buttons, clicking on a screen, or automatically. So I reckon
these days you would just sign, "you-MIND HOT thumb-UP-UP?"
"Turn the thermostat up."
Turn the temperature down:
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American Sign Language (ASL) online at American Sign Language University ™
ASL resources by Lifeprint.com © Dr. William Vicars