Global Atmospheric Temperature

This series of charts includes global analyses of surface and near-surface air temperature as well as links to data for specific stations.    Select desired field from menu at left. 

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Data for these analyses is from the NCEP Reanalysis and the Climate Prediction Center.  NCEP is an acronym for the US National Centers for Environmental Prediction.

Aids to interpreting plots: 

Definitions
 
Climatology The long-term average of a given variable, often the 30-year period 1961-1990.
Anomaly The difference between the observed value of a variable and its climatological value.
Pentad A 5-day average of a variable, starting from 1-5 Jan, 6-10 Jan, ..., 27-31 Dec.  On plots using pentad data, the date for the "middle" of the pentad is displayed: 3 Jan, 8 Jan, ... , 29 Dec.
hPa The abbreviation for "hectopascal", a unit of atmospheric pressure.  For comparison, the atmospheric pressure near the earth's surface is roughly 1000 hPa (its less at higher elevations).  The 250 hPa level in the atmosphere is roughly 10 km above the earth's surface.  One hPa equals one "millibar" or "mb" the pressure units also displayed on some plots.
Percentiles Percentiles represent a ranking of the data over a given base period.  Data in the zeroth percentile have the lowest value in the base period while those at the hundreth percentile have the highest value during the base period.  On some plots the percentiles are displayed from 0 to 1 (the percentiles are divided by 100).