Starting June 23rd, this website will undergo maintenance that may cause temporary interruptions to data updates and site availability over the next week. We apologize for any inconvenience and appreciate your patience.
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Note:
The current gridded SPI datasets are based on data through 2012. New gridded datasets for the SPI and other indices are coming soon.
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Climate Layers
Atlas Stations
Stations
Homogeneous Clusters
Clusters
U.S. Drought Monitor
(12/29/2009)
D0 - Abnormally Dry
D1 - Moderate Drought
D2 - Severe Drought
D3 - Extreme Drought
D4 - Exceptional Drought
Week
12/29/2020
12/22/2020
12/15/2020
12/8/2020
12/1/2020
11/24/2020
11/17/2020
11/10/2020
11/3/2020
10/27/2020
10/20/2020
10/13/2020
10/6/2020
9/29/2020
9/22/2020
9/15/2020
9/8/2020
9/1/2020
8/25/2020
8/18/2020
8/11/2020
8/4/2020
7/28/2020
7/21/2020
7/14/2020
7/7/2020
6/30/2020
6/23/2020
6/16/2020
6/9/2020
6/2/2020
5/26/2020
5/19/2020
5/12/2020
5/5/2020
4/28/2020
4/21/2020
4/14/2020
4/7/2020
3/31/2020
3/24/2020
3/17/2020
3/10/2020
3/3/2020
2/25/2020
2/18/2020
2/11/2020
2/4/2020
1/28/2020
1/21/2020
1/14/2020
1/7/2020
12/31/2019
12/24/2019
12/17/2019
12/10/2019
12/3/2019
11/26/2019
11/19/2019
11/12/2019
11/5/2019
10/29/2019
10/22/2019
10/15/2019
10/8/2019
10/1/2019
9/24/2019
9/17/2019
9/10/2019
9/3/2019
8/27/2019
8/20/2019
8/13/2019
8/6/2019
7/30/2019
7/23/2019
7/16/2019
7/9/2019
7/2/2019
6/25/2019
6/18/2019
6/11/2019
6/4/2019
5/28/2019
5/21/2019
5/14/2019
5/7/2019
4/30/2019
4/23/2019
4/16/2019
4/9/2019
4/2/2019
3/26/2019
3/19/2019
3/12/2019
3/5/2019
2/26/2019
2/19/2019
2/12/2019
2/5/2019
1/29/2019
1/22/2019
1/15/2019
1/8/2019
1/1/2019
12/25/2018
12/18/2018
12/11/2018
12/4/2018
11/27/2018
11/20/2018
11/13/2018
11/6/2018
10/30/2018
10/23/2018
10/16/2018
10/9/2018
10/2/2018
9/25/2018
9/18/2018
9/11/2018
9/4/2018
8/28/2018
8/21/2018
8/14/2018
8/7/2018
7/31/2018
7/24/2018
7/17/2018
7/10/2018
7/3/2018
6/26/2018
6/19/2018
6/12/2018
6/5/2018
5/29/2018
5/22/2018
5/15/2018
5/8/2018
5/1/2018
4/24/2018
4/17/2018
4/10/2018
4/3/2018
3/27/2018
3/20/2018
3/13/2018
3/6/2018
2/27/2018
2/20/2018
2/13/2018
2/6/2018
1/30/2018
1/23/2018
1/16/2018
1/9/2018
1/2/2018
12/26/2017
12/19/2017
12/12/2017
12/5/2017
11/28/2017
11/21/2017
11/14/2017
11/7/2017
10/31/2017
10/24/2017
10/17/2017
10/10/2017
10/3/2017
9/26/2017
9/19/2017
9/12/2017
9/5/2017
8/29/2017
8/22/2017
8/15/2017
8/8/2017
8/1/2017
7/25/2017
7/18/2017
7/11/2017
7/4/2017
6/27/2017
6/20/2017
6/13/2017
6/6/2017
5/30/2017
5/23/2017
5/16/2017
5/9/2017
5/2/2017
4/25/2017
4/18/2017
4/11/2017
4/4/2017
3/28/2017
3/21/2017
3/14/2017
3/7/2017
2/28/2017
2/21/2017
2/14/2017
2/7/2017
1/31/2017
1/24/2017
1/17/2017
1/10/2017
1/3/2017
12/27/2016
12/20/2016
12/13/2016
12/6/2016
11/29/2016
11/22/2016
11/15/2016
11/8/2016
11/1/2016
10/25/2016
10/18/2016
10/11/2016
10/4/2016
9/27/2016
9/20/2016
9/13/2016
9/6/2016
8/30/2016
8/23/2016
8/16/2016
8/9/2016
8/2/2016
7/26/2016
7/19/2016
7/12/2016
7/5/2016
6/28/2016
6/21/2016
6/14/2016
6/7/2016
5/31/2016
5/24/2016
5/17/2016
5/10/2016
5/3/2016
4/26/2016
4/19/2016
4/12/2016
4/5/2016
3/29/2016
3/22/2016
3/15/2016
3/8/2016
3/1/2016
2/23/2016
2/16/2016
2/9/2016
2/2/2016
1/26/2016
1/19/2016
1/12/2016
1/5/2016
12/29/2015
12/22/2015
12/15/2015
12/8/2015
12/1/2015
11/24/2015
11/17/2015
11/10/2015
11/3/2015
10/27/2015
10/20/2015
10/13/2015
10/6/2015
9/29/2015
9/22/2015
9/15/2015
9/8/2015
9/1/2015
8/25/2015
8/18/2015
8/11/2015
8/4/2015
7/28/2015
7/21/2015
7/14/2015
7/7/2015
6/30/2015
6/23/2015
6/16/2015
6/9/2015
6/2/2015
5/26/2015
5/19/2015
5/12/2015
5/5/2015
4/28/2015
4/21/2015
4/14/2015
4/7/2015
3/31/2015
3/24/2015
3/17/2015
3/10/2015
3/3/2015
2/24/2015
2/17/2015
2/10/2015
2/3/2015
1/27/2015
1/20/2015
1/13/2015
1/6/2015
12/30/2014
12/23/2014
12/16/2014
12/9/2014
12/2/2014
11/25/2014
11/18/2014
11/11/2014
11/4/2014
10/28/2014
10/21/2014
10/14/2014
10/7/2014
9/30/2014
9/23/2014
9/16/2014
9/9/2014
9/2/2014
8/26/2014
8/19/2014
8/12/2014
8/5/2014
7/29/2014
7/22/2014
7/15/2014
7/8/2014
7/1/2014
6/24/2014
6/17/2014
6/10/2014
6/3/2014
5/27/2014
5/20/2014
5/13/2014
5/6/2014
4/29/2014
4/22/2014
4/15/2014
4/8/2014
4/1/2014
3/25/2014
3/18/2014
3/11/2014
3/4/2014
2/25/2014
2/18/2014
2/11/2014
2/4/2014
1/28/2014
1/21/2014
1/14/2014
1/7/2014
12/31/2013
12/24/2013
12/17/2013
12/10/2013
12/3/2013
11/26/2013
11/19/2013
11/12/2013
11/5/2013
10/29/2013
10/22/2013
10/15/2013
10/8/2013
10/1/2013
9/24/2013
9/17/2013
9/10/2013
9/3/2013
8/27/2013
8/20/2013
8/13/2013
8/6/2013
7/30/2013
7/23/2013
7/16/2013
7/9/2013
7/2/2013
6/25/2013
6/18/2013
6/11/2013
6/4/2013
5/28/2013
5/21/2013
5/14/2013
5/7/2013
4/30/2013
4/23/2013
4/16/2013
4/9/2013
4/2/2013
3/26/2013
3/19/2013
3/12/2013
3/5/2013
2/26/2013
2/19/2013
2/12/2013
2/5/2013
1/29/2013
1/22/2013
1/15/2013
1/8/2013
1/1/2013
12/25/2012
12/18/2012
12/11/2012
12/4/2012
11/27/2012
11/20/2012
11/13/2012
11/6/2012
10/30/2012
10/23/2012
10/16/2012
10/9/2012
10/2/2012
9/25/2012
9/18/2012
9/11/2012
9/4/2012
8/28/2012
8/21/2012
8/14/2012
8/7/2012
7/31/2012
7/24/2012
7/17/2012
7/10/2012
7/3/2012
6/26/2012
6/19/2012
6/12/2012
6/5/2012
5/29/2012
5/22/2012
5/15/2012
5/8/2012
5/1/2012
4/24/2012
4/17/2012
4/10/2012
4/3/2012
3/27/2012
3/20/2012
3/13/2012
3/6/2012
2/28/2012
2/21/2012
2/14/2012
2/7/2012
1/31/2012
1/24/2012
1/17/2012
1/10/2012
1/3/2012
12/27/2011
12/20/2011
12/13/2011
12/6/2011
11/29/2011
11/22/2011
11/15/2011
11/8/2011
11/1/2011
10/25/2011
10/18/2011
10/11/2011
10/4/2011
9/27/2011
9/20/2011
9/13/2011
9/6/2011
8/30/2011
8/23/2011
8/16/2011
8/9/2011
8/2/2011
7/26/2011
7/19/2011
7/12/2011
7/5/2011
6/28/2011
6/21/2011
6/14/2011
6/7/2011
5/31/2011
5/24/2011
5/17/2011
5/10/2011
5/3/2011
4/26/2011
4/19/2011
4/12/2011
4/5/2011
3/29/2011
3/22/2011
3/15/2011
3/8/2011
3/1/2011
2/22/2011
2/15/2011
2/8/2011
2/1/2011
1/25/2011
1/18/2011
1/11/2011
1/4/2011
12/28/2010
12/21/2010
12/14/2010
12/7/2010
11/30/2010
11/23/2010
11/16/2010
11/9/2010
11/2/2010
10/26/2010
10/19/2010
10/12/2010
10/5/2010
9/28/2010
9/21/2010
9/14/2010
9/7/2010
8/31/2010
8/24/2010
8/17/2010
8/10/2010
8/3/2010
7/27/2010
7/20/2010
7/13/2010
7/6/2010
6/29/2010
6/22/2010
6/15/2010
6/8/2010
6/1/2010
5/25/2010
5/18/2010
5/11/2010
5/4/2010
4/27/2010
4/20/2010
4/13/2010
4/6/2010
3/30/2010
3/23/2010
3/16/2010
3/9/2010
3/2/2010
2/23/2010
2/16/2010
2/9/2010
2/2/2010
1/26/2010
1/19/2010
1/12/2010
1/5/2010
12/29/2009
12/22/2009
12/15/2009
12/8/2009
12/1/2009
11/24/2009
11/17/2009
11/10/2009
11/3/2009
10/27/2009
10/20/2009
10/13/2009
10/6/2009
9/29/2009
9/22/2009
9/15/2009
9/8/2009
9/1/2009
8/25/2009
8/18/2009
8/11/2009
8/4/2009
7/28/2009
7/21/2009
7/14/2009
7/7/2009
6/30/2009
6/23/2009
6/16/2009
6/9/2009
6/2/2009
5/26/2009
5/19/2009
5/12/2009
5/5/2009
4/28/2009
4/21/2009
4/14/2009
4/7/2009
3/31/2009
3/24/2009
3/17/2009
3/10/2009
3/3/2009
2/24/2009
2/17/2009
2/10/2009
2/3/2009
1/27/2009
1/20/2009
1/13/2009
1/6/2009
12/30/2008
12/23/2008
12/16/2008
12/9/2008
12/2/2008
11/25/2008
11/18/2008
11/11/2008
11/4/2008
10/28/2008
10/21/2008
10/14/2008
10/7/2008
9/30/2008
9/23/2008
9/16/2008
9/9/2008
9/2/2008
8/26/2008
8/19/2008
8/12/2008
8/5/2008
7/29/2008
7/22/2008
7/15/2008
7/8/2008
7/1/2008
6/24/2008
6/17/2008
6/10/2008
6/3/2008
5/27/2008
5/20/2008
5/13/2008
5/6/2008
4/29/2008
4/22/2008
4/15/2008
4/8/2008
4/1/2008
3/25/2008
3/18/2008
3/11/2008
3/4/2008
2/26/2008
2/19/2008
2/12/2008
2/5/2008
1/29/2008
1/22/2008
1/15/2008
1/8/2008
1/1/2008
12/25/2007
12/18/2007
12/11/2007
12/4/2007
11/27/2007
11/20/2007
11/13/2007
11/6/2007
10/30/2007
10/23/2007
10/16/2007
10/9/2007
10/2/2007
9/25/2007
9/18/2007
9/11/2007
9/4/2007
8/28/2007
8/21/2007
8/14/2007
8/7/2007
7/31/2007
7/24/2007
7/17/2007
7/10/2007
7/3/2007
6/26/2007
6/19/2007
6/12/2007
6/5/2007
5/29/2007
5/22/2007
5/15/2007
5/8/2007
5/1/2007
4/24/2007
4/17/2007
4/10/2007
4/3/2007
3/27/2007
3/20/2007
3/13/2007
3/6/2007
2/27/2007
2/20/2007
2/13/2007
2/6/2007
1/30/2007
1/23/2007
1/16/2007
1/9/2007
1/2/2007
12/26/2006
12/19/2006
12/12/2006
12/5/2006
11/28/2006
11/21/2006
11/14/2006
11/7/2006
10/31/2006
10/24/2006
10/17/2006
10/10/2006
10/3/2006
9/26/2006
9/19/2006
9/12/2006
9/5/2006
8/29/2006
8/22/2006
8/15/2006
8/8/2006
8/1/2006
7/25/2006
7/18/2006
7/11/2006
7/4/2006
6/27/2006
6/20/2006
6/13/2006
6/6/2006
5/30/2006
5/23/2006
5/16/2006
5/9/2006
5/2/2006
4/25/2006
4/18/2006
4/11/2006
4/4/2006
3/28/2006
3/21/2006
3/14/2006
3/7/2006
2/28/2006
2/21/2006
2/14/2006
2/7/2006
1/31/2006
1/24/2006
1/17/2006
1/10/2006
1/3/2006
12/27/2005
12/20/2005
12/13/2005
12/6/2005
11/29/2005
11/22/2005
11/15/2005
11/8/2005
11/1/2005
10/25/2005
10/18/2005
10/11/2005
10/4/2005
9/27/2005
9/20/2005
9/13/2005
9/6/2005
8/30/2005
8/23/2005
8/16/2005
8/9/2005
8/2/2005
7/26/2005
7/19/2005
7/12/2005
7/5/2005
6/28/2005
6/21/2005
6/14/2005
6/7/2005
5/31/2005
5/24/2005
5/17/2005
5/10/2005
5/3/2005
4/26/2005
4/19/2005
4/12/2005
4/5/2005
3/29/2005
3/22/2005
3/15/2005
3/8/2005
3/1/2005
2/22/2005
2/15/2005
2/8/2005
2/1/2005
1/25/2005
1/18/2005
1/11/2005
1/4/2005
12/28/2004
12/21/2004
12/14/2004
12/7/2004
11/30/2004
11/23/2004
11/16/2004
11/9/2004
11/2/2004
10/26/2004
10/19/2004
10/12/2004
10/5/2004
9/28/2004
9/21/2004
9/14/2004
9/7/2004
8/31/2004
8/24/2004
8/17/2004
8/10/2004
8/3/2004
7/27/2004
7/20/2004
7/13/2004
7/6/2004
6/29/2004
6/22/2004
6/15/2004
6/8/2004
6/1/2004
5/25/2004
5/18/2004
5/11/2004
5/4/2004
4/27/2004
4/20/2004
4/13/2004
4/6/2004
3/30/2004
3/23/2004
3/16/2004
3/9/2004
3/2/2004
2/24/2004
2/17/2004
2/10/2004
2/3/2004
1/27/2004
1/20/2004
1/13/2004
1/6/2004
12/30/2003
12/23/2003
12/16/2003
12/9/2003
12/2/2003
11/25/2003
11/18/2003
11/11/2003
11/4/2003
10/28/2003
10/21/2003
10/14/2003
10/7/2003
9/30/2003
9/23/2003
9/16/2003
9/9/2003
9/2/2003
8/26/2003
8/19/2003
8/12/2003
8/5/2003
7/29/2003
7/22/2003
7/15/2003
7/8/2003
7/1/2003
6/24/2003
6/17/2003
6/10/2003
6/3/2003
5/27/2003
5/20/2003
5/13/2003
5/6/2003
4/29/2003
4/22/2003
4/15/2003
4/8/2003
4/1/2003
3/25/2003
3/18/2003
3/11/2003
3/4/2003
2/25/2003
2/18/2003
2/11/2003
2/4/2003
1/28/2003
1/21/2003
1/14/2003
1/7/2003
12/31/2002
12/24/2002
12/17/2002
12/10/2002
12/3/2002
11/26/2002
11/19/2002
11/12/2002
11/5/2002
10/29/2002
10/22/2002
10/15/2002
10/8/2002
10/1/2002
9/24/2002
9/17/2002
9/10/2002
9/3/2002
8/27/2002
8/20/2002
8/13/2002
8/6/2002
7/30/2002
7/23/2002
7/16/2002
7/9/2002
7/2/2002
6/25/2002
6/18/2002
6/11/2002
6/4/2002
5/28/2002
5/21/2002
5/14/2002
5/7/2002
4/30/2002
4/23/2002
4/16/2002
4/9/2002
4/2/2002
3/26/2002
3/19/2002
3/12/2002
3/5/2002
2/26/2002
2/19/2002
2/12/2002
2/5/2002
1/29/2002
1/22/2002
1/15/2002
1/8/2002
1/1/2002
12/25/2001
12/18/2001
12/11/2001
12/4/2001
11/27/2001
11/20/2001
11/13/2001
11/6/2001
10/30/2001
10/23/2001
10/16/2001
10/9/2001
10/2/2001
9/25/2001
9/18/2001
9/11/2001
9/4/2001
8/28/2001
8/21/2001
8/14/2001
8/7/2001
7/31/2001
7/24/2001
7/17/2001
7/10/2001
7/3/2001
6/26/2001
6/19/2001
6/12/2001
6/5/2001
5/29/2001
5/22/2001
5/15/2001
5/8/2001
5/1/2001
4/24/2001
4/17/2001
4/10/2001
4/3/2001
3/27/2001
3/20/2001
3/13/2001
3/6/2001
2/27/2001
2/20/2001
2/13/2001
2/6/2001
1/30/2001
1/23/2001
1/16/2001
1/9/2001
1/2/2001
12/26/2000
12/19/2000
12/12/2000
12/5/2000
11/28/2000
11/21/2000
11/14/2000
11/7/2000
10/31/2000
10/24/2000
10/17/2000
10/10/2000
10/3/2000
9/26/2000
9/19/2000
9/12/2000
9/5/2000
8/29/2000
8/22/2000
8/15/2000
8/8/2000
8/1/2000
7/25/2000
7/18/2000
7/11/2000
7/4/2000
6/27/2000
6/20/2000
6/13/2000
6/6/2000
5/30/2000
5/23/2000
5/16/2000
5/9/2000
5/2/2000
4/25/2000
4/18/2000
4/11/2000
4/4/2000
3/28/2000
3/21/2000
3/14/2000
3/7/2000
2/29/2000
2/22/2000
2/15/2000
2/8/2000
2/1/2000
1/25/2000
1/18/2000
1/11/2000
1/4/2000
Gridded SPI
(12/23/2012; 1 Month)
-3.00 or below
-2.99 to -2.50
-2.49 to -2.00
-1.99 to -1.50
-1.49 to -1.00
-0.99 to 0.99
1.00 to 1.50
1.51 to 2.00
2.01 to 2.50
2.50 to 3.00
Above 3.00
Dataset
Serially Complete
Raw
Aggregate
Weekly
Monthly
Year
Week
Timestep
1 Month
2 Month
3 Month
4 Month
5 Month
6 Month
7 Month
8 Month
9 Month
10 Month
11 Month
12 Month
18 Month
24 Month
Refresh
Station-based SPI
(12/23/2020; 1 Month)
3.00 and above
2.51 to 2.99
2.01 to 2.50
1.51 to 2.00
1.00 to 1.50
-0.99 to 0.99
-1.49 to -1.00
-1.99 to -1.50
-2.49 to -2.00
-2.99 to -2.50
-3.00 and below
No Data
Dataset
Serially Complete
Raw
Aggregate
Weekly
Monthly
Year
Week
Timestep
1 Month
2 Month
3 Month
4 Month
5 Month
6 Month
7 Month
8 Month
9 Month
10 Month
11 Month
12 Month
18 Month
24 Month
36 Month
48 Month
60 Month
72 Month
84 Month
96 Month
Refresh
Station-based SPEI
(12/23/2020; 1 Month)
3.00 and above
2.51 to 2.99
2.01 to 2.50
1.51 to 2.00
1.00 to 1.50
-0.99 to 0.99
-1.49 to -1.00
-1.99 to -1.50
-2.49 to -2.00
-2.99 to -2.50
-3.00 and below
No Data
Dataset
Serially Complete
Raw
Aggregate
Weekly
Monthly
Year
Week
Timestep
1 Month
2 Month
3 Month
4 Month
5 Month
6 Month
7 Month
8 Month
9 Month
10 Month
11 Month
12 Month
18 Month
24 Month
36 Month
48 Month
60 Month
72 Month
84 Month
96 Month
Refresh
Station-based PDSI
(12/1/2020)
4.00 or greater
3.00 to 3.99
2.00 to 2.99
-1.99 to 1.99
-2.99 to -2.00
-3.99 to -3.00
-4.00 and below
No Data
Type
Normal
Self-calibrated
Year
Month
Refresh
Station-based Deciles
(12/3/2020; 1 Month)
99.1% to 100.0%
98.1% to 99.0%
95.1% to 98.0%
90.1% to 95.0%
70.1% to 90.0%
30.1% to 70.0%
10.1% to 30.0%
5.1% to 10.0%
2.1% to 5.0%
1.1% to 2.0%
0.0% to 1.0%
No Data
Dataset
Serially Complete
Raw
Aggregate
Weekly
Monthly
Year
Week
Timestep
1 Month
2 Month
3 Month
4 Month
5 Month
6 Month
7 Month
8 Month
9 Month
10 Month
11 Month
12 Month
18 Month
24 Month
36 Month
48 Month
60 Month
72 Month
84 Month
96 Month
Refresh
Station Trend
Positive Trend
Negative Trend
No Trend
Index
Precip
Dry Streaks
Dry Days
SPI
SPEI
PDSI
Self-calibrated PDSI
Start Year
1930
1950
1970
1975
1980
1985
Significance
0.025
0.05
0.1
0.15
0.2
Season
Calendar Year
Water Year
Growing Season
Winter
Spring
Summer
Fall
Calendar Year
Winter
Spring
Summer
Fall
Calendar Year
Water Year
Growing Season
Winter
Spring
Summer
Fall
Calendar Year
Growing Season
Winter
Spring
Summer
Fall
Precipitation Threshold
0.01
0.1
0.5
0.75
1.0
Update
Base Layers
States
States
Counties
Counties
Climate Divisions
Climate Divisions
County Warning Areas
County Warning Areas
RMA Regions
RMA Regions
River Basins
(HUC 2)
HUCs
HUC Size
HUC 2
HUC 4
HUC 6
HUC 8
Tribal Lands
Tribal Lands
Federal Lands
Federal Lands
Regional Climate Centers
Regional Climate Centers
FEMA Regions
FEMA Regions
NWS Regions
NWS Regions
USDA Climate Hubs
USDA Climate Hubs