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Monthly Temperature Percentile
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Data: CAMS surface temperature anomaly (deg. C) on a 2.0 x 2.0 deg. lat/lon grid
Climatology:  University of East Anglia 0.5 x 0.5 deg. lat/lon gridded temperature climatology.
Base Period:  1961-1990
Data Source:  NCEP, Climate Prediction Center

Description:
The percentiles shown indicate a ranking of  temperature anomalies (for the month shown on plot) with the 0th percentile being the coldest during the base period and the 100th percentile (shown as 1 on the plot) being the warmest.  Red and dark red shading is above 80th and 90th percentile, respectively; regions shaded in light and dark blue indicate temperatures below the 20th and 10th percentile, respectively.

The temperature data is based on surface observing stations.  The period used for computing the percentiles is 1961-1990.  "CAMS" is an acronym for the "Climate Anomaly Monitoring System" in use at the Climate Prediction Center (CPC) at the US National Centers for Environmental Prediction (NCEP).