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Northern hemipshire temperature-anomalies & Global warming

Northern hemipshire temperature-anomalies from 4 different sources what at available on the net.
Noteble here are that every source use different timeframe as "normal" average and also that for how long time backvards data are available vary. Data are updated once a month.

UAH

°C

Show years:

Info:
Average: 1981-2000
Measured with NOAA-satellites.
Data from year: 1979

DATABY University of Alabama/National Space Science and Technology Center (NSSTC) .

RSS

°C

Show years:

Info:
Average: 1979-1998
Measured with NOAA-satellites
Data from year: 1979

DATABY Remote Sensing Systems/NASA .

NCDC

°C

Show years:

Info:
Average: 1901-2000
Surface data: Global Historical Climate Network (GHCN)
Ocean data: Extended reconstructed sea surface temperature (ERSST)
Data from year: 1880

DATABY NOAA/National Climatic Data Center (NCDC) .

HadCRUT4

°C

Show years:

Info:
Average: 1961-1990
Measured with ca 3000 weatherstations, mainly in USA, South Canada, Europe and Japan.
Data from year: 1850
This is what ie. IPCC use.

DATABY UK MetOffice/Hadley Centre .


Disclaimer: This is not a declaration for or against global warming, just shows the differences between different data sources.
WEATHER TRIVIA -  AstronomyNeptune was discovered in 1846 (over 150 years ago). Since that time it has still yet to make a complete orbit around the sun, because one Neptune year lasts 165 Earth years!