The 2013 ASHRAE Handbook-Fundamentals includes monthly precipitation data for each station: average monthly, standard deviation, and minimum/maximum monthly precipitation (see image of summary table from chapter 14).

The data in the 2013 Fundamentals come from a number of sources, some of which include hourly data:

GHCN. 2011. GHCN monthly. National Climatic Data Center, National Oceanic and Atmospheric Administration, Asheville, NC. http://www.ncdc.noaa.gov/ghcnm/

GPCC. 2011. Global Precipitation Climatology Centre data.
ftp://ftp-anon.dwd.de/pub/data/gpcc/html/gpcc_normals_download.html

FAO. 2011. Climate impact on agriculture. Food and Agriculture Organization of the United Nations, Rome. http://geonetwork3.fao.org/climpag/agroclimdb_en.php

NASA. 2008. Surface meteorology and solar energy. Atmospheric Science Data Center, National Aeronautics and Space Administration, Washington, D.C. http://eosweb.larc.nasa.gov/sse

VASClimO. 2011. ftp://ftp-anon.dwd.de/pub/data/gpcc/html/vasclimo_download.htm

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