The CRU TS series of data sets (CRU TS = Climatic Research Unit Timeseries) contain monthly timeseries of precipitation, daily maximum and minimum temperatures, cloud cover, and other variables covering Earth's land areas for 1901-2012 (CRU TS3.21 is a recent release). The data set is gridded to 0.5x0.5 degree resolution, based on analysis of over 4000 individual weather station records. Many of the input records have been homogenized, but the data set itself is not strictly homogeneous. Long-term trends of air temperature over large areas are very similar to data sets such as CRUTEM4. The precipitation data have been used to assess global precipitation variability and to derive gridded drought indices such as the sc-PDSI and the SPI. The large number of variables enables many additional studies of climate variability and extremes. Nonetheless, when possible, studies of trends should consider whether the trends are physically consistent with other variables from independent data sets.
University of East Anglia Climatic Research Unit (CRU). [Phil Jones, Ian Harris]. CRU TS3.21: Climatic Research Unit (CRU) Time-Series (TS) Version 3.21 of High Resolution Gridded Data of Month-by-month Variation in Climate (Jan. 1901 - Dec. 2012), [Internet]. NCAS British Atmospheric Data Centre, 2013, Date of citation. Available from http: //badc.nerc.ac.uk/view/badc.nerc.ac.uk__ATOM__ACTIVITY_0c08abfc-f2d5-11e2-a948-00163e251233 ; doi: 10.5285/D0E1585D-3417-485F-87AE-4FCECF10A992
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|Average annual precipitation amount across the United States according to CRUTS3.21 (credit: NCAR Climate Data Guide, D. Schneider)|
|CRU TS3.21: July climatological wet day frequency (WET) and precipitation (PRE) for 1991-2000. (credit: NCAR Climate Data Guide, D. Shea)|
|CRU TS3.21: July climatological mean temperature (TMP) and diurnal temperature range (DTR) for 1991-2000. (credit: NCAR Climate Data Guide, D. Shea)|
|CRU TS3.21: July climatological minimum (TMN) and maximum tempeatures (TMX) for 1991-2000. (credit: NCAR Climate Data Guide, D. Shea)|
|CRU TS3.21: July climatological potential evapotranspiration (PET) and vapor pressure (VAP) for 1991-2000. (credit: NCAR Climate Data Guide, D. Shea)|
|CRU TS3.21: July climatological cloud cover (CLD) and ground frost frequency (FRS) for 1991-2000. (credit: NCAR Climate Data Guide, D. Shea)|
National Center for Atmospheric Research Staff (Eds). Last modified 20 Aug 2014. "The Climate Data Guide: CRU TS3.21 Gridded precipitation and other meteorological variables since 1901 ." Retrieved from https://climatedataguide.ucar.edu/climate-data/cru-ts321-gridded-precipitation-and-other-meteorological-variables-1901.