I finished a couple of days ago the annual computation of climate trends calculated from the measurements at meteoLCD, Diekirch (Luxembourg). As usual, the numbers show a much less spectacular evolution than the emotional media reports suggest.
- Lets start by the ambient air temperature:
The thermometers have not been displaced since 2002: the calculated blue regression line for 2002 to 2015 shows no warming, but a very small cooling!
A very similar picture is given by the temperature data of our national meteorological station at the Findel airport. The next graph was made using the homogenized data of NASA’s Gistemp:
Here the cooling rate for the 2002 to 2015 period is -0.0058 °C/year, quite negligible!
Did you hear the anthem “there are no more winters?” Actually this ongoing 2016 winter really seems absent, but the overall picture for 1998-2015 is a remarkable cooling:
This plot of the December-January-February winter periods shows a visible cooling of 0.6°C per decade at the Findel airport. If we restrict our analysis to the 2002-2015, there still is no serious warming to be seen at the Findel: just a meager +0.08 °C warming per decade, very close to zero.
Our Diekirch data for the 2002-2015 winters also show only a modest winter warming of 0.5°C/decade and a good correlation with the NAO (North Atlantic Oscillation), a natural phenomenon which has a big influence on European climate: note how the trend lines of Diekirch, the Findel, Germany (DE) and the NOA index are very similar.
You might compare this with the January trend of the German weatherstations given at the NoTricksZone blog!
Finally let us finish this first part with a look on the DTR = daily temperature range = daily Tmax – daily Tmin. The global warming advocates always point to this measure as a sign for an ongoing warming caused by human activity: global warming should decrease the DTR, because it would make the nights warmer than the afternoons, and as a consequence decrease the DTR. Here our Diekirch data:
All trends are practically zero: +0.2 °C/decade from 1998 to 2015 and -0.1 °C/decade for 2002-2015.
So lets finish this first part with a first conclusion: no big warming seen here in Luxembourg since at least 14 years!
to be continued…..