FAQ

[Q] How to generate daily weather data?

Question

Can someone tell me how to generate daily weather data from an historical daily meteorological data using DSSAT (WeatherMan)?

Answer

In order to generate daily weather data you require climate data as input. WeatherMan has the capability to create the climate data if you import at least 5 to 10 years of daily weather data. Once you have created the climate data file with WeatherMan there is a separate option to generate daily weather data and then to export the files.In DSSAT you need to select externally generated weather data in the simulation controls in order for the model to find the data.

About Gerrit Hoogenboom

Professor, University of Florida

14 Awesome Comments So Far

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  1. Amir
    April 17, 2014 at 11:18 am #

    Hi all

    where can I download the weatherman for win 64 bit?

    Best,

    • Jawoo Koo
      April 20, 2014 at 9:24 am #

      WeatherMan should work fine for the 64-bit Windows. Note that the WeatherMan is part of DSSAT (you can request to download DSSAT from http://dssat.net/downloads. Let us know if you find any error message.

  2. Name (required)
    January 16, 2015 at 4:37 pm #

    I’ve imported six years of daily weather data into Weatherman which includes radiation, max and min temperature, precipitation, and windrun. I am able to correct missing values for all parameters lest windrun. Does anyone know how to correct missing windrun data?

    Thanks in advance,

    Mike B.

  3. Name (required)
    October 25, 2016 at 1:59 pm #

    Hi,
    For a growing season of canola (around 5 months); is that okay if I choose 4 weeks (before and after)as weather records data to perform “What-if” analyses??? or Do I need more???

    Thank

    • Gerrit Hoogenboom
      March 3, 2017 at 8:25 am #

      Very good question. It depends somewhat on your “what-if” analysis. If you are planning to change planting dates, you need to make sure that you have sufficient data to cover your planting date range for your analysis. If you are planning to change your variety, a longer season variety could require more weather data.

    • Name (required)
      March 28, 2017 at 3:01 am #

      Hello,
      I have 50 years of historical weather and I want to generate weather from today until the end of the season to estimate a range of probable yields for my on-going season. How much years should I generate to have a good estimation? I see quite often 30 years generation, but I dont know the reason for such number. Would the estimation be better as much years are generated?

      Thanks

      • Gerrit Hoogenboom
        March 28, 2017 at 11:22 am #

        Hello,

        If you have 50 years of weather data available I would use all 50 years to complete your weather data from today until the end of the season. I suggest that in this case you do not use the weather generator as you have a very good historical data set. You might also want to consider looking at the Weather Analogue program. It will check your 50 years of historical weather data and select the year that is most similar to your current weather data. It will also fill your weather file with the data from the analogue year.

  4. Maria
    March 3, 2017 at 4:06 am #

    Hello

    Once I have generated daily weather data with the weatherMa tool, How can I create different weather scenarios?
    Thanks

    • Gerrit Hoogenboom
      March 3, 2017 at 9:03 am #

      The weather generator in WeatherMan can only generate different sequences of daily weather data. Once you have generated them within WeatherMan, you need to export the generated weather data similar to exporting observed data. Select File, Save Station and then the Generated Data Tab.

  5. Ranjeet Jha
    April 7, 2017 at 4:39 pm #

    Hi,

    In weather data inputs, relative humidity is not the necessary requirement, right? If I am doing the analysis for future climate change, so I have Solar radiation, Precipitation, minimum and maximum temperature from GCMs simulation. So, I was just wondering that these should be sufficient for DSSAT simulation, right?

    Thanks,

    Ranjeet

    • Gerrit Hoogenboom
      April 11, 2017 at 4:29 pm #

      DSSAT requires daily maximum and minimum temperature, solar radiation, and precipitation as input.

      Regards,

      Gerrit

  6. Joy
    September 12, 2017 at 2:48 am #

    Hi,
    If I have ran climate data from global model CESM, how could I transfer it into file forms that DSSAT needs.
    Thanks,
    Joy

    • Gerrit Hoogenboom
      September 12, 2017 at 9:29 am #

      DSSAT requires daily weather data as input. You can use the Environmental Modification section if you Delta climate change equivalent data. Otherwise you can use one of the weather generators if you have all the climate input data required for the weather generator.

      Regards,

      Gerrit

      • Joy
        September 13, 2017 at 3:19 am #

        Sorry, I’m new to DSSAT. What’s Environmental Modification section? And could you recommend any weather generator?

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