1. AccuWeather RealFeel is an equation-based measure of temperature intended to describe the “actual” feeling of temperature in the presence of exacerbating factors which may make it “seem” colder than the real temperature. RealFeel, then, is like windchill, except RealFeel also takes into account other factors such as humidity, cloud cover, the angle of the sun, etc. In essence, it’s a fancier — and AccuWeather-branded — version of windchill.
2. There is absolutely nothing subjective or “unscientific” about either RealFeel or windchill. Consider windchill, for instance.
(a) In normal conditions, you are enclosed as you move in a pocket of warm air insulating your skin from the brunt of the cold air (your “epiclimate”).
(b) Wind, however, has the power of reducing or destroying this epiclimate, thereby allowing for more rapid heat-loss from your body into the air.
(c ) Since the rate of heat-transfer between two bodies is proportional to their difference in temperature, an increased rate of heat-loss due to wind (via advection) corresponds to a larger difference in temperature between your body and the environment than actually exists.
(d) RealFeel works similarly, except that it takes into account other modes of heat-transfer besides air-based advection due to the wind.
(e) Thus, in summary neither RealFeel nor windchill incorporate anything whatsoever that is truly subjective or beyond objective measurement: they are models of heat-transfer which, while they might not take into account every relevant aspect of our physical organism, nonetheless *are* perfectly accurate at modeling what they model — viz., the relationship between temperature and heat-transfer for certain bodies in certain environments.
3. (a) And yet I claim they are a lie. But in what sense? They lie, I contend, to the extent that both windchill and RealFeel make a subjective claim regarding what the weather “really” feels like. Judged by this standard, they both fail — at least in my own experience.
(b) The subjective claim of windchill and RealFeel reliably fails, I suspect, because they are based on bad — or incomplete, to be less judgmental about it — phenomenology. Even if such measures *could* accurately model every relevant aspect of our physical organism in the physical environment we occupy, they still could not tell reliably tell us how cold it will feel for the simple reason that we are a psychological as well as a physical organism.
(c ) The psychological, like the physical, has its own dynamic which must be taken into account by any measure that purports to make a subjective claim about how temperature feels. To that end, here are three semi-speculative critiques of pseudo-subjective measures of temperature.
4. The epiclimate of time. In addition to a literal, physical epiclimate which encloses us — i.e., the gradient of warm or warmer air between our bodies and the environment — we also possess a figurative, psychological epiclimate. Whereas the physical epiclimate is extended through space, the psychological epiclimate is extended through time via memory and anticipation. I *was* warm a few minutes ago, and I *will be* warm in a few more. To the extent I am “still” dwelling in the past and have “already” arrived in the future, I am not cold. I am cold, to be sure, but I am also not yet cold and no longer cold. RealFeel assumes a pure and instantaneous experience of the present, but the present is never fully present for anyone in this way.
5. The homogeneity of the subject. Each spring when the temperatures creep up into the 40s, we bask in what, six months from now, will chill us to the bone. Our springtime selves feel what our falltime selves do not. What terrorizes our cousins in Florida lulls to sleep our penpals in Minnesota. RealFeel presupposes a generic, homogeneous, and history-less subject, but each of us perceives temperature only against the background of his or her particular history of previous experiences of temperature.
6. The inconstancy of temperature as sign. (a) On the one hand, temperature is a thermodynamic measure of some region of the universe. On the other hand, it is a sign for “how cold” something feels. With regard to the first, temperature has a fixed definition and reference, but with regard to the second, it has a meaning that could vary according to what different specific temperatures people happen to associate with different levels of coldness.
(b) To see how the two can come apart, let RealFeel remain the familiar equation-based measure from (1)-(2), but let RealRealFeel by contrast be the the subjective claim of temperature — i.e, what some temperature T under conditions C actually feels like.
(c ) Thus, RealFeel tracks temperature as thermodynamic measure or as theory, whereas RealRealFeel tracks temperature as phenomenological claim or as sign.
(d) Now, let us assume weather conditions are such that RealFeel is below the actual temperature — for instance, it’s windy. However, let us also suppose that conditions are typical (it’s a windy place in the winter).
(f) Yet if those conditions are truly typical (in a certain locale at a time of year, etc.), then RealRealFeel will not be lower than T, but rather exactly T. This is because under those circumstances T will feel like it always and typically feels like.
(g) Likewise, we would get the same result if we assume people are only moved to look up temperature T under some especially notable set of conditions (for instance, say nobody looks up the temperature except when it’s windy). If that is the case, then they will have no reference point for how T “feels” other than the present windy circumstances. Therefore, the RealRealFeel will be T even though the RealFeel is less than T.