Climate trends at Diekirch, Luxembourg (part 1: air temperature)

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.

  1. Lets start by the ambient air temperature:

airtemp_trend_1998_2015

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:

Findel_airtemp_Gistemp_1998_2015

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:

Winter_1998_2015This 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.

Winter_2002_2015

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.

DJF_winter_airtemp_trends_2002_2015
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:

dtr_trend_1998_2015

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…..

One Response to “Climate trends at Diekirch, Luxembourg (part 1: air temperature)”

  1. De temperaturen in Duitsland | klimaatblog Says:

    […] verloop van de temperatuur krijgt op veel plaatsen aandacht, zoals bij Francis Massen in Luxemburg en op het Duitse blog van Die Kalte […]

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