you are at an airport which experiences the passage of a cold front in the early afternoon. Shortly afterwards, the clouds scatter out leaving a clear sky. During the next 12 hours, you would expect the temperature to:
a) decrease then increase slightly
b) steadily decrease
c) remain relatively constant
d) increase slightly then decrease
Answer is D... WHY?
Once the sun goes down and the clear night becomes prevalent (no heat retention by the clouds) and in a colder air mass, the temperature should fall too.
Remember....we pilots learn the very basics of a lot of things...electrical, powerplant, aerodynamics, met, etc. In reality all these things are a lot more complex than what we learn for the licence. But on occasion such as the question for the thread, it is digging a bit deeper and then you discover that a cold front is not just a cold front, there are different kinds of cold fronts just like we may explain the very basics of how to land an airplane to a non-pilot when there can be many different techniques and other bits of info that are occasionally used but not explained.....
"In the wake of the front, cold-air advection tends to promote currents of sinking air, which helps cause clouds to evaporate, promoting clearing or partially clearing skies. Cold fronts that promote currents of sinking air in their wakes are called katafronts. A katafront, by definition, is a front with sinking air currents on its cold side. Most cold fronts are katafronts."
"However, not all cold fronts behave this way. For particularly slow-moving cold fronts, it is possible to have rising air behind the surface front (along the upper-level frontal zone). Weather forecasters refer to any kind of surface front characterized by upward motion on its cold side as an anafront. Anafrontal cold fronts often have steady rain or snow that develops within the cold air behind the front."
"What to expect with a cold front...
(a) cold advection in its wake. Temperatures often fall after a cold front passes as a colder mass arrives (although this may not be the case in the warmer months, when solar heating during the day can overwhelm cold advection).
(d) sinking air and clearing skies behind the front, as long as it's a katafront (as most cold fronts are)."
Maybe the answer I gave would be more correct in that it clears out then warms up due to daytime heating then cools off in the evening. And that is only sometimes but it is the only correct possibility of the four options.