[Rosie] Apparent Temperature? It's a "feels like" approximation relating to how the human body reacts to current conditions. If you pop off to one of my web sites here and open the INFO section of the menu bar you will find a few other methods of calculating that in the middle "Bio Indexes" [sic] choice. If you bang around the site you will find other data showing local conditions, current and historical. As far as the temperature curves, yes, it tends to trend to maximum and then descend to minimum readings at a fairly rapid rate, although the falling temperature is generally somewhat slower than the the rising one. After two days of relatively cool maxima as I type the outside temperature is a little over 31ºC with a projected maximum of or about 35ºC.
(Dujon) I've only had two 35's in 36 years, 3 Aug 90 and 10 Aug 03. Highest minimum was 20.0°C, lowest max was something I didn't think was possible, viz -9.2°C and on this day in 1987.
(Rosie) -9ºC maximum? Blimey, that is a bit on the parky side. Since I've lived in this part of the country we haven't had a minimum that approaches that level of coolness. I have three Canadian cyberfriends who would giggle at that - one is in Quebec (Montreal) and the other two out west in B.C. where a maximum of -20ºC is apparently a balmy winter's day.
(Duj) It was a sunny day with snow on the ground and a light easterly wind and it just wouldn't warm up. The reason lay in the air above, an import from north-west Russia. Even the high June sun falling on dry ground would have made little impression on that column of frigidity so the January sun slanting in on a snow surface had no chance. AFAIK my recording was the lowest in the country (unofficial) but if there'd been a weather station at the top of the North Downs, nearly 900 ft, it would have been colder still, the opposite of what normally happens when it gets very cold. The temperature was below freezing continuously for 11 days and stayed below -5°C for 3 days. The UK record for a low max is -19°C (Braemar, Scottish Highlands, 10/1/82). Nothing could move; all the diesel had waxed out.