The annual rainfall for 2015 in Wembury was 1071.1 mm, which was very close (102%) to the 2001-2015 average.
However the graph for 2001-2015 shows an increasing trend.
The standard deviation is +/- 156 mm which gives a measure of expected variability about the average.
The magnitude of the trend with a linear fit is 233 mm.
This is greater than the standard deviation and therefore can be considered significant.
Increasing annual rainfall
Increasing annual rainfall
Len
Wembury, SW Devon coast
83 m amsl
Wembury, SW Devon coast
83 m amsl
- Graham Easterling
- Posts: 15
- Joined: Sat Dec 12, 2015 8:03 pm
- Location: Penzance
- Contact:
Re: Increasing annual rainfall
In Penzance, mean rainfall:-
1961-1990 1140.0mm
1971-2000 1189.3mm
1981-2010 1219.6mm
2010-2015 1245.1mm
So there seems to have been an gradual upward trend for the last 50 years!
I also noticed your post on USW about lack of warming in reccent years. In Penzance, whilst the temperature has been flat for the last 10 years, there was a distinct upward trend for a good time up until then.
Mean Annual Temperature
1961-1990 11.1C
1981-2010 11.6C
1961-1990 1140.0mm
1971-2000 1189.3mm
1981-2010 1219.6mm
2010-2015 1245.1mm
So there seems to have been an gradual upward trend for the last 50 years!
I also noticed your post on USW about lack of warming in reccent years. In Penzance, whilst the temperature has been flat for the last 10 years, there was a distinct upward trend for a good time up until then.
Mean Annual Temperature
1961-1990 11.1C
1981-2010 11.6C
Graham Easterling
Penzance
Website http://penzanceweather.atspace.com/weather.html
Site Details
Grid Reference: SW464231
Altitude: 19 metres
Aspect: South-East
Penzance
Website http://penzanceweather.atspace.com/weather.html
Site Details
Grid Reference: SW464231
Altitude: 19 metres
Aspect: South-East
- Martin Rowley
- Posts: 34
- Joined: Sat Dec 12, 2015 8:32 pm
- Location: West Moors, East Dorset
Re: Increasing annual rainfall
... Using Hurn data (ex. MetO web site) for the periods Graham quotes above:Graham Easterling wrote:In Penzance, mean rainfall:-
1961-1990 1140.0mm
1971-2000 1189.3mm
1981-2010 1219.6mm
2010-2015 1245.1mm
So there seems to have been an gradual upward trend for the last 50 years!
1961-1990 790.1 mm
1971-2000 812.4 mm
1981-2010 835.2 mm
2010-2015 917.5 mm [ 6 years - skewed strongly by the two wet years 2012 & 2014]
Martin.
Martin Rowley
West Moors, East Dorset
Lat: 50deg 49.25'N, Long: 01deg 53.05'W
Height (amsl): 17 m (56 feet)
COL category: C1 overall/TRSHEUN=CC-A03-
West Moors, East Dorset
Lat: 50deg 49.25'N, Long: 01deg 53.05'W
Height (amsl): 17 m (56 feet)
COL category: C1 overall/TRSHEUN=CC-A03-
- John Wilson
- Posts: 13
- Joined: Sat Dec 12, 2015 8:40 pm
- Location: Mapperley Plains, Arnold, Notts.
Re: Increasing annual rainfall
A graph of my annual rainfall from 1994 (when readings began) is very similar to that of Len's. So definitely a gradual but significant increase over a fairly short time (20+ years). Does this hold for the whole of the UK? Have some areas experienced a greater increase than others? A small research project for COL members!
My December rainfall was 82.6mm; 141% of long term average.
Regards to all
John
My December rainfall was 82.6mm; 141% of long term average.
Regards to all
John