The California State Climate Office collects and interprets climate data for California, and disseminates climate data and information through various means including this portal. The California State Climate Office is housed in the California Department of Water Resources' Division of Flood Management.
California also has the California Climate Data Archive at the Western Region Climate Center - a project sponsored by the the Western Region Climate Center, the California Department of Water Resources, the California Energy Commission and the Scripps Institute of Oceanography.
Daily Drought Information Summary - http://cdec.water.ca.gov/cgi-progs/reports/DROUGHTSUM
Daily Hydrologic Conditions Summary - http://cdec.water.ca.gov/floodER/hydro/
Department Drought Publications Page - http://www.water.ca.gov/waterconditions/publications.cfm
April Climate Notables
Northern California 8-Station Index:
High Precipitation 1948 with 13.0 inches
Low Precipitation 1939 with 0.43 inches
Average is 3.9 inches
San Joaquin 5-Station Index:
High Precipitation 1967 13.13 inches
Low Precipitation 2008 with 0.20 inches
Average is 3.5 inches
Death Valley began a string of 205 consecutive days with a high temperature above 90°F in 1992
Average Maximum Temperatures for April
Los Angeles 71.0
San Diego 67.4
Death Valley 89.8
April 1st is considered the historical peak of the snowpack building period for California. WY 2015 has set a new record for low snowpack with a value of 5% of average. Previous low of 25% of average was set in 1977 and tied in 2014.