I've been hearing weather reports on the radio (WTOP), and
hearing them give overnight temperature like "10 above". Someone
else complained that "above" is a reminder that we're so close to
"below". My problem with it is different. And probably a bit
idiosyncratic, so it doesn't count as a complaint against the
radio station (but I'll still count it as a complaint against
this particular scale -- PBBBBBT!).
I hear "ten above", and my first thought is not, "above zero";
it's "above freezing". Similarly for "five below" -- I think
"below freezing". And that's a Hell of a lot warmer that what
these people are actually saying. Or what I'm feeling when I
hear it. So I've got this moment of cognitive dissonance (which
is much more pleasant when it's about buttered-popcorn-flavoured
jelly beans than when it's about interpreting a weather report)
as I sort it out in my head and remind myself that they mean
relative-to-zero, not relative-to-freezing.
Besides, from a human-comfort standpoint, above or below
freezing is more significant than above or below "already
cold as Hell".
I don't have this problem with "ten" (assumed positive), or
"negative ten" (clearly zero-relative). And I get the impression
most of the DC area doesn't have my problem with "above" and
"below" by themselves.
Obviously, the Celsius scale is one way around this cognitive
dissonance: "zero" and "freezing" are the same number. And my
preferred scale, Kelvin, fixes this by not having any temperatures
below zero, ever. So my brain-glitch is specific to the Fahrenheit
scale.
Fahrenheit is ever so much more familiar to me, being the
scale I grew up with, the only temperature scale I knew existed
until the abortive attempt to gradually nudge the US to the metric
system, and still the scale I see on every bank time-and-temperature
sign or television broadcast and hear on every radio report. It's
on nearly every weather web site (many allow a choice of F, C, or
both; I've found none that display K for me *pout*). Many bank
signs display both C and F, but some only display F -- I don't
remember seeing any in Maryland that display Centigrade only.
So despite my possibly-annoying habit of saying the temperature
in Kelvins, I know at a gut level what 15 F, 20 F, 32 F, 40 F,
55 F, 68 F, 75 F, 80 F, 90 F, and 110 F all feel like, what they
mean in terms of clothing choices and health issues and equipment
failure, and what they imply for oncoming weather. (I also know
immediately what 263 K, 273 K, 280 K, and 300 K mean, but have to
think about other temperatures in Kelvins. I make a show of using
Kelvins partly to make other people more familiar with the concept,
partly as a bit of personal silliness, and mostly in the hope that
if I use it enough, it'll eventually be as familiar to me as Fahrenheit.
Since I like Kelvin so much better, it'd be nice to be able to
use it on a "don't have to think about it" level the way I've been
able to use Fahrenheit, which I don't like anywhere near as much,
most of my life.)
So there's one of my complaints about the Fahrenheit scale, or
rather about the way people say temperatures in it. My
mind keeps going to the wrong reference point for "above" and
"below".