Cumbria Weather Forum
 Weather chat and discussion for Cumbria - Established 2nd November 2009

 

 

 
  Index  • Wiki  • FAQ  •  Search  

It is currently Sun Dec 17, 2017 1:16 am




Post new topic Reply to topic  [ 15 posts ]  Go to page Previous  1, 2
 Means Rules- help and advice 
Author Message
 Post subject: Re: Means Rules- help and advice
PostPosted: Fri Jan 04, 2013 2:05 pm 
Weather Nut
User avatar

Joined: Mon Nov 02, 2009 10:23 pm
Posts: 1900
Location: Maulds Meaburn, Cumbria
Altitude: 183
Weather Station: Davis VPro2
Reply with quote
I did previously mention this:

So how do you work out seasonal and yearly averages then?

A - the sum of the mean temps divide by 12 and then apply those rules re 0.05, 0.15, etc or

B - the sum of the mean min/max divide by 2 and then apply the above rules?


But there is a C and 2012 as provided an example of when it matters!

using A my yearly mean is 8.24c - gets rounded down to 8.2c
using B my yearly mean is 8.25c - gets rounded up to 8.3c

And at this point I did think that if a monthly temp is calculated by B, then it should follow that a yeraly mean should be calculated the same way (and not use A)

But I now expect you all to use C which is the only true way - but takes a little more time!

C - is the total of all 365/6 min' temps + the total of all the 365/6 mean max' temps divide by 730/732

And guess what - using C my yearly mean is 8.26c - rounded up to 8.3c

I now expect you all to check and if necessary revise all your data!!!!!!!!!!!!!!!!!!!!!!!!!!!!

_________________
Darren Rogers - he who submits the most interesting posts, AKA Mr Data
Maulds Meaburn


Offline
 Profile  
 
 Post subject: Re: Means Rules- help and advice
PostPosted: Fri Jan 04, 2013 8:19 pm 
Professor
User avatar

Joined: Mon Nov 02, 2009 8:52 pm
Posts: 7698
Location: Brampton
Altitude: 117m
Weather Station: Davis VP2
Reply with quote
:o

_________________
Paul C
Brampton. 117m ASL.
http://www.bramptonweather.co.uk
Imagehttps://twitter.com/#!/pacrabtree


Offline
 Profile  
 
 Post subject: Re: Means Rules- help and advice
PostPosted: Fri Jan 04, 2013 8:26 pm 
Professor
User avatar

Joined: Mon Nov 02, 2009 8:52 pm
Posts: 7698
Location: Brampton
Altitude: 117m
Weather Station: Davis VP2
Reply with quote
Totally confused now Darren

But I,m sure it should work out the same ?

here are mine attached


Attachments:
Capture.JPG
Capture.JPG [ 167.4 KiB | Viewed 1068 times ]
Capture1.JPG
Capture1.JPG [ 163.22 KiB | Viewed 1068 times ]

_________________
Paul C
Brampton. 117m ASL.
http://www.bramptonweather.co.uk
Imagehttps://twitter.com/#!/pacrabtree
Offline
 Profile  
 
 Post subject: Re: Means Rules- help and advice
PostPosted: Sat Jan 05, 2013 12:40 pm 
Weather Nut
User avatar

Joined: Mon Nov 02, 2009 10:23 pm
Posts: 1900
Location: Maulds Meaburn, Cumbria
Altitude: 183
Weather Station: Davis VPro2
Reply with quote
Paul - it's simple really and also obvious.

you use all 30/31 min temps in a month to calculate a mean min and then ditto for the mean max - you now add them all together.
then use that totals and divide by 60/62 to calculate your mean temp for the month - then 'throw to the odd' if necessary.

To calculate the yearly mean min/max and then mean is just the same, but now instead of 60/62 numbers you have 730/732.

_________________
Darren Rogers - he who submits the most interesting posts, AKA Mr Data
Maulds Meaburn


Offline
 Profile  
 
 Post subject: Re: Means Rules- help and advice
PostPosted: Sat Apr 06, 2013 1:01 pm 
Weather Nut
User avatar

Joined: Mon Nov 02, 2009 10:23 pm
Posts: 1900
Location: Maulds Meaburn, Cumbria
Altitude: 183
Weather Station: Davis VPro2
Reply with quote
I'm going to have to amend this really.

after March threw up another oddity (a mean min of -1.6c and a max' of 4.9c = 1.65c which should be thrown to the odd of 1.7c - why did my spread sheet show a mean of 1.6c - answer was that the 62 min/max readings actually = 1.6489c - so it rounded it down!!!

So anyway, Philip Eden tells me that he always quotes his figures to two decimal points and which really is quite logical.

so from now on i will quote my mean to 2 decimal points - so March 2013 is obviously 1.65c

now going through the process of changing back all my other months to two decimal places - quite easy really as i had done 50% of them that way anyway

_________________
Darren Rogers - he who submits the most interesting posts, AKA Mr Data
Maulds Meaburn


Offline
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 15 posts ]  Go to page Previous  1, 2


 Who is online 

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

 
Index  |  FAQ  |  Search

phpBB skin developed by: John Olson
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group