Here are some links to useful climate data/tools. There’re my favourite places to get simple data.
If anyone uses anything different, please leave let me know!
KMNI’s Climate Explorer – excellent tool to get loads of data and basic plots. I’ve always found the inface friendly too.
NASA’s GISS Surface Temperature Analysis (GISTEMP) – raw station data and nice plotting tool.
UEA’s Climatic Research Unit have lots of data but no plotting tools.
Daily Earth Temperatures from Satellites – if you want satellite derived temperatures from various levels, this is the place to go.
NOAA’s National Climatic Data Centre – looks like there’s lots there but I’ve never really looked through it.
The University of Wyoming’s weather balloon data – probably a bit niche for this list but this is an amazing archive of balloon data from all over the world! Surely you need to check just how strong the Antarctic inversion is today? No?
Andy Russell's weather and climate blog 