The current (1520Z) METAR shows a temperature of 2°C. This must be
wrong. The temperature in my screen (5 miles west of Biggin Hill, same
altitude) is 3.9°C at the moment (1658Z), about a degree lower than at
1520Z, according to the thermograph. Gatwick currently has 6°C. I
have long suspected the Biggin Hill temperatures as being low but this
looks even more in error than usual. However, we should be grateful
for small mercies. The previous METAR (1420Z) showed a temperature of
-49°C, dewpoint -57°C, so the Chinook has arrived.
Tudor Hughes, Warlingham, Surrey, 556 ft.