date: Thu, 10 Sep 2009 10:48:47 +0100 from: Ian Harris subject: Re: cruts to: t.osborn@uea.ac.uk Hi Tim, On 10 Sep 2009, at 10:01, Tim Osborn wrote: > Thanks. see Q below... > > On Thu, September 10, 2009 9:57 am, Ian Harris wrote: >> I would add that I'm still investigating. It looks like a database >> difference, here are the French mean, min, max: >> >> For 0909041051, original db: >> 2003 6 16.13 6.90 20.60 >> 2003 7 18.58 9.40 23.80 >> 2003 8 18.25 8.90 23.80 >> >> For 0909021348, latest db: >> 2003 6 19.12 8.50 23.60 >> 2003 7 20.61 12.20 26.70 >> 2003 8 21.04 11.90 26.60 > > What are these? Values for an individual station? Is it odd that > mean is > not equal to the average of min and max? Or does France not > operate on > the convention that Tmean = 0.5*(Tmin+Tmax), and instead do > something like > Tmean = average of 6-hourly or hourly obs? Sorry - didn't mean to confuse things. This is part of the output from my 'retrace' program. The mean is the spatial mean of all the cells in the country, but the min and max are for the highest and lowest cell (I deleted the coordinates that are also output). Cheers Harry Ian "Harry" Harris Climatic Research Unit School of Environmental Sciences University of East Anglia Norwich NR4 7TJ United Kingdom