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Background on the Meteorological Datasets

We foresee that this data can be useful in making rainwater harvesting and water balance estimates, in various research areas, climate change adaptation studies and more. We also believe in the democratising effect of having this kind of data freely available to the general public.

Introduction
Meteorological data essential for water resource planning and research is fairly difficult to obtain for the Indian citizen. At the same time, in the past decade, several international initiatives have put online published global datasets that represent a significant knowledge bank that could be put to good use in India. Entire datasets from 1901 to 2002 for any part of India based on simple on-line dropdown menus is made available for users. Users are encouraged to use this data judiciously. From this dataset, several useful estimates pertaining to the water balance can be made.

Data Source
The database that is used for this work, is the publicly available Climate Research Unit (CRU) TS2.1 dataset, out of the Tyndall Centre for Climate Change Research, School of Environmental Sciences, University of East Anglia in Norwich, UK. This published dataset consists of interpolated (on a 0.5 degree latitude-longitude grid) global monthly rainfall, temperature, humidity and cloud cover data, from 1901 to 2002 (Mitchell and Jones, 2005).

Processing of the CRU dataset:
Typically, large spatiotemporal datasets of this sort require the use of Geographic Information Systems (GIS). For the purpose of converting the CRU dataset from its orginal format, the opensource GIS software GRASS (Geographic Resources Analytical Support System) was used on a Ubuntu Linux operating system. The original datasets, available at Click here, were converted into GRASS raster formats. GRASS GIS modules along with Linux scripting were used to extract the monthly average rainfall; maximum, minimum and average temperatures; and vapour pressure (humidity), from 1901 to 2002, for the Indian subcontinent.

The Evapotranspiration data was derived from the weather data using the procedures of the FAO-56 manual (Allen et. al, 1998), referenced at the bottom of this page. Click here

The district-wise meteorological data was obtained by simple linear averaging from the gridded data of the CRU dataset. Where there were data gaps in the CRU grids and the data gap was less than 25% of the district area, we have done a simple approximation to get the data for each district. Where the data gap was more than 25% we have not shown any data for that district.

Notes:
Local data should be used wherever available. This dataset is most useful for regional applications. Examples of such use include (but is not limited to):

  • Regional, or basin-wide rainfall and weather assessments including water balance modeling;
  • Regional, or basin-wide rainwater harvesting potential;
  • A preliminary estimate of the water balance for smaller areas, when local data is unavailable;
  • A comparison of rainfall and other weather parameters between different regions/basins.
  • We request that any use of the data should acknowledge the India Water Portal, the Tyndall Centre for Climate Change Research, and also include Mitchell et al. publication

Acknowledgements:
Vishal K. Mehta - Arghyam/Cornell University, Climate Research Unit, UK.
We thank Professors Stephen D. DeGloria and M. Todd Walter of Cornell University, for their guidance in accomplishing this work.

References and Recommended Reading:
Mitchell, T.D., Jone, P.D. (2005). "An improved method of constructing a database of monthly climate observations and associated highresolution grids" International Journal of Climatology 25:693712
Read the paper

Allen, R. G., Pereira, L.S., Raes, D., Smith, M. (1998). "Crop evapotranspiration: Guidelines for computing crop water requirements" FAO Irrigation and drainage paper 56, Rome, Italy. Click here

Comments

14. Need rainfall data of India over the last ten years

Hi,

Let me know where I can get the rainfall data of all over India of the last 10 years.

Thanks

13. Need rainfall data for Dindigul district

Need rainfall data for Dindigul district.

12. Please use the Met data tool

Dear Mr. Thakkar,

Please make use of the Met data application we have in IWP. In this application, entire datasets for various meteorological indicators from 1901 to 2002, for any part of India, is made available for users, in a simple format. The following link takes you to the application - http://indiawaterportal.org/met_data/

The application is quite simple to use. You need to enter the required state and district in the relevant columns. Enter the data type (Temperature, Precipitation etc.,), choose the period for which you need the data. You will be able to generate annual mean, monthly mean for each year as well as annual totals.

Click here for the 2004-2008 meteorological data extracted from the IMD website - http://www.indiawaterportal.org/node/7185

You can also download the district-wise monthly rainfall data from 2004-2010 for the whole of India from the link provided here - http://www.indiawaterportal.org/node/7185

Regards,
Seetha Gopalakrishnan
India Water Portal Team

11. Need climatic data for weather stations in Dahod district

Dear sir,

I require the following daily data for weather stations located in Dahod District, Gujarat, for the period of 1965 to 2010. Let me know the availability of these data:
1. Max temp data
2. Min temp data
3. Relative humidity
4. Sun-shine data
5. Wind direction

I will be grateful for required guidance in this matter.

From,
Amee Thakkar

10. Met data tool for state wise and month wise rainfall data

Dear Mr. Sharma,

Please use the Met data application we have in IWP. In this application, entire datasets for various meteorological indicators from 1901 to 2002, for any part of India, is made available for users, in a simple format. The following link takes you to the application - http://indiawaterportal.org/met_data/

The application is quite simple to use. You need to enter the required state and district in the relevant columns. Enter the data type (precipitation in your case), choose the period for which you need the data. You will be able to generate annual mean, monthly mean for each year as well as annual totals.

Regards,
Seetha Gopalakrishnan
India Water Portal Team

9. Need state wise rainfall data for 2001-2004

Sir,

I need the state wise/month wise rainfall data for following states
1. Uttar Pradesh
2. Tail Nadu
3. Maharashtra
4. Karnataka

Please guide me the site from where I can get this data.

Hari Om Sharma

8. Some useful links

Dear Soumit,

Regarding rainfall data, you could use the Met data application we have here in IWP. In this application, entire datasets for various meteorological indicators from 1901 to 2002, for any part of India, is made available for users, in a simple format. The following link takes you to the application - http://indiawaterportal.org/met_data/

The application is quite simple to use. You need to enter the required state and district in the relevant columns. Enter the data type (precipitation in your case), choose the period for which you need the data. You will be able to generate annual mean, monthly mean for each year as well as annual totals.

Click here for the 2004-2008 meteorological data extracted from the IMD website - http://www.indiawaterportal.org/node/7185

You can also download the district-wise monthly rainfall data from 2004-2010 for the whole of India from the link provided here - http://www.indiawaterportal.org/node/7185

Apart from this, India Water Portal has recently launched a data finder http://www.indiawaterportal.org/datafinder where you can search for the data as per your requirement by adding specifications to your search. This search tool gives you the link of the source from where the data can be obtained and also describes briefly the contents of the document. I hope you will be able to get some useful information from this search tool.

Warm Regards,
Seetha Gopalakrishnan
India Water Portal Team

7. Need rain & snowfall data of Kullu District, Himachal Pradesh

Can you please send me the rainfall & snowfall data pertaining to monthly mean for each year from 1990 to 2011 of Kullu District in Himachal Pradesh (specifically for Manikaran/ Parbati Valley) including the percentage departures of rainfall from the long period averages of rainfall

Thanks,
Soumit

6. Need last 10 years rainfall data of Andhra Pradesh

Please send last 10 years rain fall data in Andhra Pradesh.

Regards,
Rajagopal

5. Any plans of compiling data from 2003-2009?

Hi,

Are there any plans of compiling the data from 2003-2009? They are available with the British Atmospheric Data Centre (BADC) since 2011 (I believe the exact dataset is the CRU TS 3.0 and 3.1).

It would be very helpful if you can prepare that data too.

Thanks and Regards,

Suchita

4. What is the query for unit of cloud cover?

Dear Sir/Ma'am

Can you please inform me what is the unit of cloud cover in the dataset?

Thanks
Regards
Darshana

3. What is unit of cloud cover

Dear Sir,

Can you please inform me what is the unit of cloud cover?

2. Weekly rainfall data 2009-2011 for Andhra Pradesh

Hi,

I require the rainfall data for Andhra Pradesh from 2009-2011. Please let me know where it is available?

Thanks

1. Availability of data in one spreadsheet

While the availability of data is in itself a welcome development, the application makes it quite tedious to extract a usable data set for further analysis, by restricting the user to a single district in any one query. It would be great if a spreadsheet could be compiled for instance, by specifying a list of states/districts in one go.

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