In message , Rob Bale
writes
When you say "compares to 30 year averages" do you mean the CET. Also
which 30 year block do you use.
Is this 30 years the golden rule.

Hi Rob

The 30-year averages are taken from the years 1971-2000. This is the
convention used by groups such as COL and the MO as it is a long enough
record to marginalise any anomalies.

hope this helps
--
Steve Jackson,
Bablake Weather Station,
Coventry, UK
http://www.bablakeweather.co.uk