CRUTEM4 station file format
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The CRUTEM4 station files contain monthly average temperature data for each station
in the CRUTEM4 database.  An example of the CRUTEM4 station data file format is given
below:

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Number= 037760
Name= LONDON/GATWICK
Country= UK
Lat=   51.2
Long=    0.2
Height= 59
Start year= 1961
End year= 2012
First Good year= 1961
Source ID= 10
Source file= Jones
Jones data to= 2012
Normals source= Data
Normals source start year= 1961
Normals source end year= 1990
Normals=   3.8   3.9   5.8   8.0  11.3  14.4  16.5  16.2  13.8  10.8   6.6   4.7 
Standard deviations source= Data
Standard deviations source start year= 1961
Standard deviations source end year= 1990
Standard deviations=   2.1   2.0   1.3   0.9   1.1   1.2   1.3   1.2   1.0   1.2   1.1   1.7 
Obs:
1961   3.9   7.1   7.5  10.3  11.0  14.7  15.9  16.1  15.7  10.9   6.4   2.7   501   501   501   501   501   501   501   501   501   501   501   501 
1962   4.1   4.5   2.5   7.6   9.8  13.0  15.1  14.7  12.6  10.5   5.9   1.7   501   501   501   501   501   501   501   501   501   501   501   501 
1963  -2.7  -0.8   6.2   8.6  10.3  14.7  15.1  14.5  13.1  10.3   8.5   2.0   501   501   501   501   501   501   501   501   501   501   501   501 

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Notes:

    * Number is a station identifier (usually the number assigned by the WMO).
    * Long is the longitude of the station. Negative values are east. 
    * Height is in metres.
    * First Good Year - data before that year are suspect.
    * Source ID is an indicator of the source of the data.
    * Source File and Jones data to are internal flags relating this file to other systems.
    * Normals and standard deviations are produced and used as described in the data set papers. One value for each calendar month (Jan-Dec) in Celsius.
    * Obs (short for Observations) are monthly average temperatures, in Celsius - one row for each year:
      - The first column is the year.
      - The following 12 columns are temperatures for each calendar month (Jan-Dec).
      - The last 12 columns indicate data sources for monthly updates for each calendar month (Jan-Dec) - see 'Data sources' below.
    * A temperature value of -99 indicates missing data.

Data sources:

    * 501 - Update of the CRUTEM4 database provided by CRU -10/09/2012 - see release notes for version CRUTEM.4.1.1.0
    * 900 - CLIMAT data quality controlled and added by the UKMO in monthly updates
    * 902 - MCDW (Monthly CLimatic Data for the World) data added by the UKMO in monthly updates

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Code:

Code will soon be provided to enable users to make gridded fields and calculate a
global average temperature anomaly time series from the station data provided here.
This code is to be released under an Open Source licence that is contained as comments
in the code. By running the code you indicate your acceptance of the licence.

Note that revisions have been made to the gridding and time series calculation procedures
used in construction of CRUTEM4, as described in Jones et al. (2012). Code provided 
for CRUTEM3 cannot reproduce the CRUTEM4 results.