On the surface the last 3 days would appear very similar.

Date Max Min Rain
15 10.0 8.2 0.0
16 10.7 8.4 0.1
17 12.8 8.7 0.0 (Highest Max since 3/12/11)

In actual fact fact, some interesting differences.

12th saw thin Sc, good visibility, brief sunny intervals

13th the sky had a distinctly unstable look. Some quite heavy looking
Cu embedded in patches of Sc, but with some deep blue clear patches. A
few very brief showers and bright sunshine mix. This unstable area
showed up well on the satellite imagery, and seemed largely limited to
Cornwall / west Devon & the sourrounding sea. Very good visibility,
and some lovely sea views..

14th. Fairly dull start with a low cloud cloud base. However it
quickly thinned & broke to give hazy sunshine & very mild conditions.
Visibility generally moderate, though occasionally quite poor.

Poor surf throughout.

Graham
Penzance

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No rain