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.
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:
||The long-term average of a given variable, often the 30-year period
||The difference between the observed value of a variable and its climatological
||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.
||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 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).