CPC produces maps and data for the U.S., monitors intraseasonal rainfall and the North America monsoon,
and provides several retrospective analyses at daily time scales.
Data Source: River Forecast Center ~5000 stations per day and
Climate Anomaly Data Base ~several hundred stations per day.
Resolution: 0.25 degree x 0.25 degree
Domain: 20 N - 60 N, 140 W - 60 W
Format: The format is sequential 32-bit IEEE floating point created
on a big_endian platform (e.g. cray, sun, sgi and hp). The undefined (missing) value is 9999.
Window: Day 1 analysis is valid for the window from 12Z on day 0 to 12Z on day 1
Analysis Scheme: Modified Cressman (1959) Scheme (Glahn et al. 1985; Charba et al. 1992).
Minimum stations for analysis: 500 for precipitation, 350 for temperature. If the number of stations is less than the minimum, then the analysis is not performed for that day.
Quality Control:
A. Duplicate Station Check
B. Data Check (buddy check, standard deviation check against climatology)
C. NEXRAD check for spurious zeros
www.nws.noaa.gov 
