Colonial Era Weather Archive (CA)

GCOS Monthly Summaries from DWD

GHCN Daily

GHCN Monthly version 2

GHCN Monthly version 3

GSN Monthly Summaries from NOAA

Global Summary of the Day

Hadley Centre - CRU

Monthly Climatic Data of the World

Scientific Committee on Antarctic Research

US Cooperative Summary of the Day

US Cooperative Summary of the Month

US First Order Summary of the Day

US Historical Climatology Network - Monthly

World Monthly Surface Station Climatology

World Weather Records