Looking at Wembury's winter rainfall there is a increasing trend of magnitude 74 mm 1985 to 2016.
The standard deviation (expected variation about the average) is 105 mm.
As the trend is less than the standard deviation I assume the trend is not statistically significant.
Winter rainfall record
Winter rainfall record
Len
Wembury, SW Devon coast
83 m amsl
Wembury, SW Devon coast
83 m amsl