Here are useful links to climate related data sources
NASA Earth Observatory
Outgoing longwave radiation (OLR)
NASA Cloud Product: Description of the tool.
Arctic and Antarctic interactive sea ice graph
Artic Sea Ice Extend for Arctic and Antarctic
Temperature measurements
Climate4you: A collection of many different climate relevant data.
Temperature.global: Online measurement and overview of global temperature
Spectroscopic tools
MODTRAN Interactive Tool for OLR IR spectra and Downwelling IR spectra
HITRAN etc: Spectroscopic Data base.
Agora – Statistics of the German energy transition
Agora-Energiewende: Useful information of hourly current energy mix in Germany including corresponding electricity trading prices.