On Jan 7, 5:34*pm, "Ian Bingham"
wrote:
My average temperature graph for January (1990-2010) shows low temperatures
at the beginning and end of the month and relatively high temperatures at
mid-month. *This appears to be due to the fact that every year in January we
seem to get a few days of more or less strong SWlies which of course raises
the temperature appreciably. *This has occurred at various times of the
month, so the average puts it in the middle, I suppose. *For example I have
as 21-year means:
Jan 1st * 2.1C
Jan 15th *4.4C
Jan 31st * 2.3C

Ian Bingham,
Inchmarlo, Aberdeenshire.

A very similar pattern here over the 20 years of my records. In fact
the 15th is the mildest day of the month with a mean temperature of
8.2C.

There are marked colder spells each side, the low points being:-

8th 6.7C
26th 6.2C - The coldest day of the winter over 20 years.

Graham
Penzance