From 1.7.11. I have become totally 'Standardised' with a Stevenson
screen (with min, max, wet and dry thermoms) to finally complement all
my other manual/standard instruments.
However, I also have a Davis Vpro2 AWS from which I have approx' 4yrs
worth of data and from which I have created average temps, etc, using
those figures - WHAT TO DO NOW?

I will obviously use the Standard (screen) figures for my monthly
averages from now on - but can, should I:
1.) Start afresh with a whole new set of 'Standard' averages (and
effectively forget about the 4yrs worth of AWS data) and/or have two
sets of averages, one Standard and one AWS, or

2.) Just keep going - but now with a mix of 4yrs AWS and now Standard
from here on in.

I have had a Snowdon rain gauge since 1.8.10. and have just kept going
with the averages. (No.2)

Opinions and or knowledge of what is best practice much appreciated

You should run a series of comparison daily readings for as long as
possible, which will enable you to correct the 4 years of Davis readings to
be equivalent to your new Stevenson Screen values. You shouldn't need to
attempt to correct individual daily max/mins, but just the monthly/annual
mean values for each month. Provided that there is no problem with the
exposure or stability of your instruments, you should get consistent stable
difference in the monthly mean values over a number of years.

--
Bernard Burton

Wokingham Berkshire.

Weather data and satellite images at:
http://www.woksat.info/wwp.html

wrote in message
...
From 1.7.11. I have become totally 'Standardised' with a Stevenson
screen (with min, max, wet and dry thermoms) to finally complement all
my other manual/standard instruments.
However, I also have a Davis Vpro2 AWS from which I have approx' 4yrs
worth of data and from which I have created average temps, etc, using
those figures - WHAT TO DO NOW?

I will obviously use the Standard (screen) figures for my monthly
averages from now on - but can, should I:
1.) Start afresh with a whole new set of 'Standard' averages (and
effectively forget about the 4yrs worth of AWS data) and/or have two
sets of averages, one Standard and one AWS, or

2.) Just keep going - but now with a mix of 4yrs AWS and now Standard
from here on in.

I have had a Snowdon rain gauge since 1.8.10. and have just kept going
with the averages. (No.2)

Opinions and or knowledge of what is best practice much appreciated

On Jul 19, 11:54*pm, "Bernard Burton"
wrote:
You should run a series of comparison daily readings for as long as
possible, which will enable you to correct the 4 years of Davis readings to
be equivalent to your new Stevenson Screen values. You shouldn't need to
attempt to correct individual daily max/mins, but just the monthly/annual
mean values for each month. Provided that there is no problem with the
exposure or stability of your instruments, you should get consistent stable
difference in the monthly mean values over a number of years.

--
Bernard Burton

Wokingham Berkshire.

Weather data and satellite images at:http://www.woksat.info/wwp.html

wrote in message

...



From 1.7.11. *I have become totally 'Standardised' with a Stevenson
screen (with min, max, wet and dry thermoms) to finally complement all
my other manual/standard instruments.
However, I also have a Davis Vpro2 AWS from which I have approx' 4yrs
worth of data and from which I have created average temps, etc, using
those figures - WHAT TO DO NOW?

I will obviously use the Standard (screen) figures for my monthly
averages from now on - but can, should I:
1.) Start afresh with a whole new set of 'Standard' averages (and
effectively forget about the 4yrs worth of AWS data) and/or have two
sets of averages, one Standard and one AWS, or

2.) Just keep going - but now with a mix of 4yrs AWS and now Standard
from here on in.

I have had a Snowdon rain gauge since 1.8.10. and have just kept going
with the averages. (No.2)

Opinions and or knowledge of what is best practice much appreciated- Hide quoted text -

- Show quoted text -

thanks for that - a third option.
sounds Ok - so far my screen mins are about -0.5c lower than the Davis
and the screen max' temps are +0.5c higher - probably mean that the
two will have a very similar monthly mean anyway(?)