State Climate Office     Arizona State University  School of Geographical Sciences, Tempe, Arizona



Arizona Monthly State Temperature & Precipitation Update


On approximately the 20th of each month the recent climate conditions across the state of Arizona are reviewed. The analysis is a cursory look at general conditions across the state.*


The primary climate variables of temperature and precipitation are monitored for the state of Arizona by climatically homogeneous areas termed ‘climate divisions’. There are 7 climate divisions for Arizona. From the stations within each climate division, mean values of temperature and precipitation for the division as a whole are computed.


Since April 2006, precipitation has been monitored for the 15 watersheds in Arizona as part of the recommendations of the Governor’s Drought Task Force.  Each month the average precipitation for each watershed is calculated and ranked against that month’s precipitation during the period of 1971-present.  Here, values for the most recent month along with 3-, 6-, 12-, 24-, 36-, and 48-month mean temperature and total precipitation values are ranked within a historical context (1895-present for temperature in the climate divisions and 1971-present for precipitation in the watersheds) and the rankings are divided by the number of years of data and multiplied by 100% to create percentiles.  Low percentile values indicate cool or dry conditions while high values indicate warm or wet conditions. For example, a temperature that falls at the 100th percentile means that it is the highest temperature for the period of record.   The ADWR Drought Program monthly drought updates use the 3-, 6-, and 12-month precipitation for short term drought status and 24-, 36-, and 48-month precipitation along with streamflow to determine the long term drought categories by watershed.


Most Recent Update:                          Archived Updates:

March 2009


September 2005

October 2005

November 2005

December 2005

January 2006

February 2006

March 2006

April 2006

May 2006

June 2006

July 2006

August 2006

September 2006

October 2006

November 2006

December 2006

January 2007

February 2007

March 2007

April 2007

May 2007

June 2007

July 2007

August 2007

September 2007

October 2007

November 2007

December 2007

January 2008

February 2008

March 2008

April 2008

May 2008

June 2008

July 2008

August 2008

September 2008

October 2008

November 2008

December 2008

January 2009

February 2009




* The information provided is derived from data produced by the National Climatic Data Center. The presentation of the data does not pre-qualify its accuracy, and care should be taken in its interpretation.

© 2009 Office of the Arizona State Climatologist