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What is CIMIS?
CIMIS is an acronym for California Irrigation Management Information System, a program unit in the Office of Water Use Efficiency (OWUE), Department of Water Resources (DWR). CIMIS is an integrated network of over 125 automated active weather stations located throughout California. Historical data is also available from an additional 61 inactive weather stations. These are weather stations that have been disconnected from the CIMIS network for various reasons. The numbers of active and inactive stations change with time as new stations are installed and existing stations disconnected.
How does CIMIS work?
Specific weather parameters are collected on site and temporarily stored in a data logger that is mounted on the mast of the weather stations. A computer at DWR headquarters in Sacramento calls every CIMIS station beginning around midnight (Pacific Standard Time) and retrieves the previous days data. The data is checked for quality and flagged, if necessary. Flagging does not mean the data is bad but as an indication of possible problems or deviations from expected normalcy. The flagging is explained in the quality control section of this web site. Reference Evapotranspiration (ETo) is calculated from this data and stored in a database along with the collected climatic data. Users can access the stored data via the Internet and/or FTP.
Can I get CIMIS data automatically delivered to my email?
Yes - the Email Scheduler is a quick and convenient feature that enables users to receive CIMIS data automatically via email.
What is the Email Scheduler?
The Email Scheduler is a convenient feature of CIMIS that enables users to receive CIMIS data automatically via email. The Email Scheduler is accessed on the CIMIS website, where users fill in a form specifying the desired CIMIS information and it will be delivered automatically to the requested email address. Users only need to fill in the form one time in order to receive automatic updates.
How do I use set up the Email Scheduler?
It�s easy to set up your Email Scheduler. Users only need to fill in the form one time in order to receive automatic updates. Begin at the CIMIS website and select the �My CIMIS� tab at the top of the page. Log on, or, if you are a new user, you will need to register. Now select �My Reports�. First, you will create one or more lists of stations for which you want CIMIS data. Go to the area titled �My Station Lists� and click �Create/Change Station Lists�. (If you need to see the station locations, go to Location Maps). Select stations for your station list(s). When you are finished, either hit the Back button or click on �My Reports� to return to the �My Reports� page. Now you will fill in the form to create a customized report. Go to the area that says �My Custom Reports� and select the word �customize� for one of the undefined report options. Give this report a name that readily identifies this list and fill out the remainder of the form specifying the information you wish to receive. You must select the box �Schedule this Report� in order to set up the email schedule. When complete, select �Save�. You have completed setting up the Email Scheduler.
When was CIMIS established?
CIMIS was established in 1982 as a joint project between the University of California, Davis (UCD) and DWR. DWR assumed management of the CIMIS program in 1985.
Is there a fee involved?
No. CIMIS is a state agency serving the public free of charge.
Who owns the CIMIS stations?
Some of the CIMIS stations are owned by DWR while local cooperators own others. The list of local cooperators includes water agencies, universities, cities, U.S. Department of Agriculture, U.S. Bureau of Reclamation, conservation districts, and private agricultural related industries.
How many years of data are used to calculate CIMIS`s historical (long-term average) data?
The number of years for historical averages vary by station, it ranges from 5 to 11 years. These averages were computed in 2000 from data collected between 1989 and 1999, and for stations that had at least 5 years of data then. Regional averages were assigned to stations that did not have at least 5 years of data. That is, averages were computed from stations within the region that met the 5 year data limit. It was felt that weather during the 5 years prior to and including 1999 was fairly representative of California average weather conditions.
What other information is available from the Weather Station List?
Information detailing each station`s geographic location including elevations, site descriptions, zip code(s) the station represents, start date, and county and nearby city are available. In this same section you will find maps giving approximate and specific locations of each station and other information regarding station components and siting criteria.
What other information can I get from the CIMIS web site?
Additional valuable information can be obtained from the CIMIS web site. Information is presented on irrigation, ETo, station siting, quality control, contacts, downloads of important documents, links to useful web sites, system news, consultants, software, ETo equations, ETo zone map, station location map, and station sensor specifications.
What do I have to do to install a new CIMIS station in my area?
You need to contact the CIMIS representatives from your district. You can get their contact information by clicking on "CIMIS Staff" from the CIMIS "Welcome" Page. You can also contact Kent Frame of DWR CIMIS headquarters at (916) 651-7030 or kframe@water.ca.gov.
I had an account for the Dial-Up/Telnet option. Can I use it on the web?
Yes, you can use the same user id and password on the web. In fact, we encourage users not to create multiple accounts so that we have accurate statistics on the use of CIMIS data. If you forget your user id and password, please email us at DWRCIMISPublicContact@water.ca.gov before you create a new account.
Why do I have to register to access CIMIS data?
Registration is purely for statistical purposes. We want to know who is using our data so that we can better serve their needs. The information you provide is confidential and will not be shared. You can obtain CIMIS data without registration but it will be limited to the previous 7 days and/or 12 months.
Whom do I contact if I have questions about CIMIS and its data?
There are several ways you can get help. You can email your questions to the Webmaster by clicking on "Contacts" at the bottom of any CIMIS Page. Alternatively, you may contact us by email at DWRCIMISPublicContact@water.ca.gov. You may also go to "CIMIS Staff" on the CIMIS Welcome Page and call or email anyone from the list.
My question isn`t listed here!
If your question is not listed here, please click here and email your question to the CIMIS public contact.
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