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A typical meteorological year (TMY) is a set of meteorological data with data values for every hour in a year for a given geographical location. The data are selected from hourly data in a longer time period (normally 10 years or more). The TMY is generated in PVGIS following the procedure described in ISO 15927-4.

The TMY tool can be used to interactively visualise all the data or to download it as a text file.

The solar radiation database (DB) used is the default DB for the given location, either PVGIS-SARAH, PVGIS-NSRDB or PVGIS-ERA5. The other meteorological variables are obtained from the ERA-Interim reanalysis.

The tool can be accessed with:

Outputs

 

csv

The CSV output contains a header with the following information:

  • Latitude [decimal degrees]
  • Longitude [decimal degrees]
  • Elevation [m]
  • A list of years used for each month to construct the TMY. If the full time series is requested, this list will not be included in the output.

After this follows the header line for the actual data. The consist of 1 year (or several years) of hourly data, each hour on a separate line, with the following columns:

  • Date & time (UTC for normal CSV, local timezone time for the EPW format)
  • T2m [°C] - Dry bulb (air) temperature.
  • RH [%] - Relative Humidity.
  • G(h) [W/m2] - Global horizontal irradiance.
  • Gb(n) [W/m2] - Direct (beam) irradiance.
  • Gd(h) [W/m2] - Diffuse horizontal irradiance.
  • IR(h) [W/m2] - Infrared radiation downwards.
  • WS10m [m/s] - Windspeed.
  • WD10m [°] - Wind direction.
  • SP [Pa] - Surface (air) pressure.

 

json

{    "inputs": {        "location": {
           "latitude": 45.809,
           "longitude": 8.632,
           "elevation": 223        },
        "meteo_data": {
           "radiation_db": "PVGIS-SARAH",
           "meteo_db": "ERA-Interim",
           "year_min": 2005,
           "year_max": 2014,
           "use_horizon": true,
           "horizon_db": "DEM-calcualted",
        }    },

    "outputs": {
        "months_selected": {
            {
                "month": 1,
                "year": 2007            },
            {...}
        },
        "tmy_hourly": {
            {
                "time": "20070101:0000",
                "T2m": 5.23,
                "RH": 79.72,
                "G(h)": 0,
                "Gb(n)": 0,
                "Gd(h)": 0,
                "IR(h)": 242.14,
                "WS10m": 1.92,
                "WD10m": 30,
                "SP": 100570,

            },
            {...}
        }
    },

    "meta": {        "inputs": { 
            "location": {
                "description": "Selected location"
                "variables": {
                    "latitude": {
                        "description": "Latitude",
                        "units": "decimal degrees"
                    }, 
                    {...}
                }
            },
            {...}
        },
        "outputs": { 
            "months_selected": {
                "type": "time series" 
                "timestamp": "monthly"
                "description": "months selected for the TMY"
            },
            {...}
        }
    }
}

 

epw

Data for use by the EnergyPlus software, the file extension is ".epw". For this format, consult the the EnergyPlus documentation