Late Pleistocene Map of California (US Geological Survey) Reconstruction of landscape features about 18,000 years ago at the peak of the last Ice Age, including mountains covered by glaciers, intermontain basin lakes and exposed shoreline.
Per Capita Urban Water Use: 1960-2005 (Public Policy Institute of California) Interactive map presents estimates of urban water use (in gallons per person per day) for California's major hydrologic regions. Each region includes a summary of population and per capita water use for selected years since 1960.
Precipitation (California Dept. of Forestry and Fire Protection, Fire and Resource Assessment Program) Isohyetal map of California at a scale of 1:1,000,000 showing mean annual precipitation during the period 1900-1960. Created from the map Mean Annual Precipitation in the California Region (Rantz) 1969/reprinted 1972 (Docs I 19.2 P92 1972).
Precipitation Frequency Atlas of the Western United States. Vol. 11. California (US National Weather Service) 1973 (Docs C 55.22 folio) Contains series of precipitation-frequency maps at a scale of 1:2 million for 6 and 24-hour durations for return periods from 2 to 100 years. Northern California and Southern California sectional maps are also available at Western U.S. Preciptation Frequency Maps (Western Regional Climate Center)
Precipitation Data (U.S. National Weather Service. California-Nevada River Forecast Center) Real-time maps of precipitation during the most recent 1-hour, 6-hour, and 24-hour periods. A complementary Rainfall Maps site is maintained by the California Department of Water Resources.
USDA Plant Hardiness Zone Map: South-West US (USDA Agricultural Research Service) 1990 (print copy available in Docs A 1:38:1475) (USDA Miscellaneous Publication # 1475) Shows the lowest temperatures that can be expected each year. Each of the 11 zones represent 10 degree F (5.6 degree C) differences in average annual minimum temperature.