Annual Precipitation Maps
| Year | Total Precipitation | Departure from Normal | Historical Ranking |
| 2011 | map | map | map |
| 2010 | map | map | map |
| 2009 | map | map | map |
| 2008 | map | map | map |
| 2007 | map | map | map |
| 2006 | map | map | map |
| 2005 | map | map | map |
| 2004 | map | map | map |
| 2003 | map | map | map |
| 2002 | map | map | map |
| 2001 | map | map | map |
| 2000 | map | map | map |
| 1999 | map | map | map |
| 1998 | map | map | map |
| 1997 | map | map | map |
| 1996 | map | map | map |
| 1995 | map | map | map |
| 1994 | map | map | map |
| 1993 | map | map | map |
| 1992 | map | map | map |
| 1991 | map | map | map |
| 1990 | map | map | map |
Data Availability
ESRI ArcView Ascii (*.asc) and Golden Software Surfer Grid (*.grd) files containing the data used in the images above are contained in a zip file. The *.zip file includes annual precipitation raster data from 1979 to 2011, and ranking and departure data from 2000 to 2011.
- Total precipitation maps present annual precipitation totals in inches.
- Departure from normal maps depict the difference between annual precipitation totals and the historical "normal". 2011 annual precipitation is compared with the 1981-2010 normal. 2003 through 2010 annual precipitation is compared with the 1971-2000 normal. Years prior to 2003 were compared with the 1961-1990 normal period.
- Historical ranking maps depict annual precipitation totals as they rank when compared to annual totals over the modern record. The values presented are percentiles. A ranking near zero indicates the year was drier than any found during the period of record. A ranking near 100 designates that the year was wetter than any found on record. A ranking of 50 is equivalent to the "median", a measure of central tendency.