Hydrology &
Flood Operations
California State Climatologist
California State Climatologist
3310 El Camino Avenue
Suite 200
Sacramento, CA 95821
Mailing Address:
P.O. Box 219000
Sacramento, CA 95821-9000
Flood & Safety Topics 
Flood
Management Hydrology & Flood Operations California State Climatologist Climate
Data
Flood
Management Hydrology & Flood Operations California State Climatologist Climate
DataClimate Data
Climate summaries are prepared monthly. Other climate data and information are provided as reference.
Climate Data and Information for California
- Monthly
Climate
Summaries- April 2013 (PDF: 433KB)
- March 2013 (PDF: 375KB)
- February 2013 (PDF: 374KB)
- January 2013 (PDF: 370KB)
- December 2012 (PDF: 835KB)
- November 2012 (PDF: 772KB)
- October 2012 (PDF: 655KB)
- September 2012 (PDF: 1MB)
- August 2012 (PDF: 306KB)
- July 2012 (PDF: 304KB)
- June 2012 (PDF: 271KB)
- May 2012 (PDF: 737KB)
- April 2012 (PDF: 234KB)
- March 2012 (PDF: 352KB)
- February 2012 (PDF: 389KB)
- January 2012 (PDF: 473KB)
- December 2011 (PDF: 370KB)
- November 2011 (PDF: 294KB)
- October 2011 (PDF: 291KB)
- September 2011 (PDF: 356KB)
- August 2011 (PDF: 288KB)
- July 2011 (PDF: 265KB)
- June 2011 (PDF: 231KB)
- May 2011 (PDF: 266KB)
- April 2011 (PDF: 238KB)
- March 2011 (PDF: 295KB)
- February 2011 (PDF: 243KB)
- January 2011 (PDF: 212KB)
- December 2010 (PDF: 389KB)
- November 2010 (PDF: 214KB)
- October 2010 (PDF: 157KB)
- September 2010 (PDF: 309KB)
- August 2010 (PDF: 157KB)
- July 2010 (PDF: 155KB)
- June 2010 (PDF: 143KB)
- May 2010 (PDF: 138KB)
- April 2010 (PDF: 143KB)
- March 2010 (PDF: 144KB)
- February 2010 (PDF: 151KB)
- January 2010 (PDF: 158KB)
- December 2009 (PDF: 247KB)
- November 2009 (PDF: 214KB)
- October 2009 (PDF: 215KB)
- September 2009 (PDF: 308KB)
- August 2009 (PDF: 212KB)
- July 2009 (PDF: 212KB)
- June 2009 (PDF: 191KB)
- May 2009 (PDF: 186KB)
- April 2009 (PDF: 191KB)
- March 2009 (PDF: 213KB)
- February 2009 (PDF: 181KB)
- January 2009 (PDF: 183KB)
- December 2008 (PDF: 120KB)
- November 2008 (PDF: 53KB)
- October 2008 (PDF: 53KB)
- September 2008 (PDF: 95KB)
- August 2008 (PDF: 183KB)
- July 2008 (PDF: 175KB)
- June 2008 (PDF: 179KB)
- May 2008 (PDF: 182KB)
- April 2008 (PDF: 366KB)
- March 2008 (PDF: 171KB)
- February 2008 (PDF: 177KB)
- January 2008 (PDF: 198KB)
- December 2007 (PDF: 49KB)
- November 2007 (PDF: 51KB)
- October 2007 (PDF: 60KB)
- September 2007 (PDF: 57KB)
- August 2007 (PDF: 65KB)
- July 2007 (PDF: 64KB)
- June 2007 (PDF: 51KB)
- May 2007 (PDF: 51KB)
- April 2007 (PDF: 576KB)
- March 2007 (PDF: 50KB)
- February 2007 (PDF: 537KB)
- January 2007 (PDF: 701KB)
- December 2006 (PDF: 44KB)
- November 2006 (PDF: 44KB)
- October 2006 (PDF: 43KB)
- September 2006 (PDF: 39KB)
- August 2006 (PDF: 42KB)
- July 2006 (PDF: 57KB)
- June 2006 (PDF: 41KB)
- May 2006 (PDF: 43KB)
- April 2006 (PDF: 50KB)
- March 2006 (PDF: 47KB)
- February 2006 (PDF: 47KB)
- January 2006 (PDF: 42KB)
- December 2005 (PDF: 51KB)
- NWS
Weather Forecast
Office (WFO) Summaries- April 2013 (PDF:93KB)
- February 2013 (PDF:86KB)
- January 2013 (PDF:87KB)
- December 2012 (PDF: 90KB)
- November 2012 (PDF: 87KB)
- September 2012 (PDF: 123KB)
- August 2012 (PDF: 132KB)
- July 2012 (PDF: 121KB)
- June 2012 (PDF: 197KB)
- May 2012 (PDF: 45KB)
- April 2012 (PDF: 93KB)
- March 2012 (PDF: 96KB)
- February 2012 (PDF: 71KB)
- January 2012 (PDF: 22KB)
- December 2011 (PDF: 67KB)
- November 2011 (PDF: 23KB)
- October 2011 (PDF: 16KB)
- September 2011 (PDF: 19KB)
- August 2011 (PDF: 65KB)
- July 2011 (PDF: 64KB)
- June 2011 (PDF: 71KB)
- May 2011 (PDF: 51KB)
- April 2011 (PDF: 48KB)
- March 2011 (PDF: 48KB)
- February 2011 (PDF: 21KB)
- January 2011 (PDF: 19KB)
- December 2010 (PDF: 144KB)
- November 2010 (PDF: 21KB)
- October 2010 (PDF: 21KB)
- September 2010 (PDF: 15KB)
- August 2010 (PDF: 26KB)
- July 2010 (PDF: 21KB)
- June 2010 (PDF: 31KB)
- May 2010 (PDF: 17KB)
- April 2010 (PDF: 20KB)
- March 2010 (PDF: 18KB)
- February 2010 (PDF: 20KB)
- January 2010 (PDF: 20KB)
- December 2009 (PDF: 17KB)
- November 2009 (PDF: 56KB)
- October 2009 (PDF: 52KB)
- September 2009 (PDF: 33KB)
- August 2009 (PDF: 44KB)
- July 2009 (PDF: 41KB)
- June 2009 (PDF: 17KB)
- May 2009 (PDF: 21KB)
- April 2009 (PDF: 27KB)
- March 2009 (PDF: 22KB)
- February 2009 (PDF: 20KB)
- January 2009 (PDF: 23KB)
- December 2008 (PDF: 23KB)
- November 2008 (PDF: 25KB)
- October 2008 (PDF: 21KB)
- September 2008 (PDF: 21KB)
- August 2008 (PDF: 22KB)
- July 2008 (PDF: 26KB)
- June 2008 (PDF: 18KB)
- May 2008 (PDF: 18KB)
- April 2008 (PDF: 25KB)
- March 2008 (PDF: 21KB)
- February 2008 (PDF: 23KB)
- January 2008 (PDF: 27KB)
- December 2007 (PDF: 21KB)
- November 2007 (PDF: 18KB)
- October 2007 (PDF: 18KB)
- September 2007 (PDF: 15KB)
- August 2007 (PDF: 16KB)
- July 2007 (PDF: 21KB)
- June 2007 (PDF: 18KB)
- May 2007 (PDF: 19KB)
- April 2007 (PDF: 20KB)
- March 2007 (PDF: 18KB)
- February 2007 (PDF: 19KB)
- January 2007 (PDF: 19KB)
- December 2006 (PDF: 16KB)
- November 2006 (PDF: 19KB)
- October 2006 (PDF: 18KB)
- September 2006 (PDF: 22KB)
- Agency
and Academic
Research Collaborative- Snow Water Equivalent, May 15, 2013 (PDF: 2.0MB)
- Snow Water Equivalent, May 8, 2013 (PDF: 2.25MB)
- Snow Water Equivalent, April 24, 2013 (PDF: 1.79MB)
- Snow Water Equivalent, April 15, 2013 (PDF: 1.63MB)
- Snow Water Equivalent, May 29, 2012 (PDF: 2.9MB)
- Snow Water Equivalent, May 22, 2012 (PDF: 3.7MB)
- Snow Water Equivalent, May 15, 2012 (PDF: 3.4MB)
- Snow Water Equivalent, May 8, 2012 (PDF: 3.4MB)
- Snow Water Equivalent, May 1, 2012 (PDF: 3.1MB)
- Snow Water Equivalent, April 24, 2012 (PDF: 1.19MB)
- Snow Water Equivalent, April 17, 2012 (PDF: 1.47MB)
- Snow Water Equivalent, April 11, 2012 (PDF: 1.47MB)
- Snow Water Equivalent, April 5, 2012 (PDF: 1.55MB)
- Snow Water Equivalent, March 28, 2012 (PDF: 1.14MB)
- Snow Water Equivalent, March 21, 2012 (PDF: 1.0MB)
- Snow Water Equivalent, March 13, 2012 (PDF: 2.5MB)
- Snow Covered Areas, Jul 2011 (PDF: 795KB)
- Snow Covered Areas, May 2011 (PDF: 584KB)
- Snow Covered Areas, April 2011 (PDF: 549KB)
- Snow Covered Areas, March 2011 (PDF: 1MB)
- Snow Covered Areas, February 2011 (PDF: 1MB)
- Snow Covered Areas, April 2009 (PDF: 1MB)
- Snow Covered Areas, March 2009 (PDF: 1MB)
- Snow Covered Areas, February 2009 (PDF: 1.2MB)
- Snow Covered Areas, May 2008 (PDF: 1.3MB)
- Snow Covered Areas, April 2008 (PDF: 946KB)
- Snow Covered Areas, March 2008 (PDF: 1.3MB)
- Snow Covered Areas, February 2008 (PDF: 1.1MB)
- Snow Covered Areas, April 2007 (PDF: 908KB)
- Snow Covered Areas, March 2007 (PDF: 750KB)
- Snow Covered Areas, February 2007 (PDF: 914KB)
- Snow Covered Areas, January 2007 (PDF: 1.5MB)
- Climate
Maps
- Water Resources of California, US Geological Survey
- Climate of California, US Geological Survey
- Weather and Climate Geospatial Resources, Humboldt State University
- General
Climate Data- Climatological Data, National Climatic Data Center
- Hourly Precipitation Data, National Climatic Data Center
- Local Climatological Data, National Climatic Data Center
- California Climate Data Archive
- California Hydrometeorological Networks
- CoCoRaHS newsletter Dec 2012 (PDF:2.8MB)
- Statewide Average of Annual
Precipitation 1890-2002 (PDF:14KB) - Monthly Historical Rain Data
- Regional Snow Water Content (PDF: 35KB)
- California Climate Extremes (PDF: 9KB)
- Drought FAQ
- Rainfall Depth-Duration-Frequency Data (Preliminary)
- Hourly Rainfall Depth-Duration-Frequency Data (Preliminary)
- Daily Rainfall Depth-Duration-Frequency Data (Preliminary)