Climate Analysis Branch
In order to help ensure that this web analysis page remains available, we would greatly appreciate feedback on its use, particularily in the clasroom, for presentations or for research. Mail to Cathy Smith at (
Background Information
Dataset Information
Related Plot/Analysis

Daily Mean Composites

As of 2014/10/03, the NCEP/NCAR Reanalysis 1 is being updated at PSD. Some products are catching up and we don't yet know when normal distribution will return at NCEP.

We have transitioned the data files from netCDF3 to netCDF4-classic format on Monday Oct 20th. As a result, the files will be compressed instead of being packed with a scale and offset. As with any netCDF4 file, the NetCDF library will perform the uncompression. We expect the files to be read faster, depending on the application you are using. Values may differ slightly because of precision issues. Please let us know if you run into any problems after first reading our netCDF4 doc. We are also changing the time units to use 1800 as the origin year for udunits. This should prove easier for users. The exception to the above are the spectral coefficients files, which are still packed.

NSSL/ESRL Partnership Composite page: derived variables created on fly

Plot daily composites (averages) of the mean or anomalies (mean - total mean) of variables from the NCEP/NCAR Reanalysis and other datasets. Long term means (climatologies) are based on 1981-2010. Data is available from Jan 1948 to Oct 22, 2014 for most variables.

Variables Analysis level?
Enter Year, Month and Day for composites To subtract one set of days from another, use a minus sign (-) before the years of the days that are to be subtracted. Default is last available date for variable.
OR to Enter Year of last day of range
OR File with Dates Optional Plot Label replaces list of dates.
Filename: Plot Label:
Days to add or subtract:
This number of days will be added (or subtracted) from all input dates. Please use all positive dates for input.
Color? Shading Type
Plot type? Mean Anomaly Climo
Scale Plot Size(%) Plot contour labels?No Yes
Override default contour interval ? Interval:Range: lowhigh
State boundries: No Yes
Region of globe
Enter lowest lat (-90 to 90) Highest lat
Enter western most longitude (0 to 360) Eastern most longitude
Choose projection for CUSTOM: Choose height range for CROSSECTION: to
error (Report Bugs)
This is a Research and Development Application