Menne et al. (2009)
Also: Menne et al. 2009
The US Historical Climatology Network monthly temperature data, version 2
Menne, M. J., Williams Jr, C. N., & Vose, R. S. (2009). The US Historical Climatology Network monthly temperature data, version 2. Bulletin of the American Meteorological Society, 90(7), 993-1007. Link to PDF
doi: http://dx.doi.org/10.1175/2008BAMS2613.1
References
All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.