The Weather Files

The Weather Files

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A SAM weather file is a text file that contains one year's worth of data in hourly or subhourly time steps. The data describes the solar resource or wind resource at a particular location. A weather file may contain typical-year data that represents long-term historical data or single-year data for a particular year. The solar resource and meteorological data in a SAM weather file may have been developed from ground measurements, data from a satellite, or a combination of the two.

For more information about weather data for SAM, see the \"Weather Data\" chapter in SAM's Help system. The Help system is available in SAM from the software's Help menu, and as a PDF file on the Download page.

The NREL National Solar Radiation Database (NSRDB) provides free time series weather data for many countries of the world. You can use the Download buttons on SAM's Location and Resource input page to download NSRDB data directly from SAM.

NCEI, the National Centers for Environmental Prediction (NCEP), and the GeophysicalFluid Dynamics Laboratory provide remote access to high-volume numerical weatherprediction and global climate models and data.

The Service Records Retention System (SRRS) stores weather observations, summaries,forecasts, warnings, and advisories provided by the U.S. National Weather Service(NWS) for public use. Congress mandates that NCEI store and retain SRRS productsfor a five-year period. SRRS records can be used for accident investigations andlitigations.

Climate will clearly play a key role in the performance of any building so it is important to use the appropriate location settings for any analysis. For Apache dynamic simulations in IESVE a simulation weather file is required. These files contain data for variables including dry bulb & wet bulb temperature, wind speed & direction, solar altitude & azimuth, cloud cover etc for each hour of the year.

The standard simulation weather files are sourced from various places and converted into the standard FWT file format. Usually the fwt will have an abbreviation that points out where the data was acquired (e.g: EWY = Example Weather Year. These are individual weather years sourced from the MET office). Most files are sourced directly from the energy plus website. You can read about different weather sources here. The weather file formats the VE can read are .fwt (proprietary format) and .epw files.

Provides the option to submit any current simulation weather file and apply WeatherShiftTM process to generate files that represent the given location in a future time period using predicted climate change scenarios.

Purchase CIBSE 2016 updated simulation weather files for 14 UK Locations. Test Reference year (TRY) and Design Summer Year (DSY) available based on current weather data and future predicted climate change data (UK Climate Impacts Programme).

The PROMETHEUS project has produced a number of future weather files (.epw format) which can be used to 'future-proof' buildings against predicted climate change. The files were created using the UKCP09 weather generator. The weather files are currently available for 45 locations, 3 time periods and 2 emissions scenarios.

A selection of EPW weather files for 78 locations in Australia can be found on the Energy Plus website. Place the .epw files in your Standard Data and Weather Files installation weather folder to read them in Apache simulations and VistaPro.

Options to purchase weather data for individual locations as either AMY or TMY via Athenium Analytics (formerly Weather Analytics). Data is available for any global location using a 30km x 30km grid and is provided as both .csv (data) and .epw (simulation weather file).

A selection of EPW weather files for more than 2,100 locations can be found on the Energy Plus website. Place the .epw files in your Standard Data and Weather Files installation weather folder to read them in Apache simulations and VistaPro.

Provides TMYx climate data for more than 16,100 locations in more than 250 countries and another 3,200 files from other data sources. Place the .epw files in your Standard Data and Weather Files installation weather folder to read them in Apache simulations and VistaPro.

This site contains climate data designed specifically to support building simulations.As such, the files are Typical Meteorological Years (TMY) and are published by a variety of organizations.The prime format of the files is \"EPW\" but each climate location zip file contains:EPW (EnergyPlus Weather Format)CLM (ESP-r weather format)WEA (Daysim weather format)PVSyst (PV Solar weatherdesign format)DDY (ASHRAE Design Conditions or \"file\" design conditions in EnergyPlus format)RAIN (hourly precipitation in m/hr, where available)STAT (expanded EnergyPlus weather statistics)Data supplied by organizations have their dataset identified in the file names (USA_AK_Adak.AP.704540_TMY3 - TMY3 dataset;BRA_AC_Feijo.AP.819240_INMET - INMET dataset; CHN_AH_Anquin.584240_CSWD - CWSD dataset)TMYx dataset are created by the authors of this website.TMYx files are typical meterological data derived from hourly weather data through 2021 in the ISD(US NOAA's Integrated Surface Database) using the TMY/ISO 15927-4:2005 methodologies.Currently, there are more than 16,100 TMYx locations supplied.For 2022, the solar data for each site has corresponding solarradiation from theERA5 reanalysis data set. The ERA5 data, courtesy ofOikolab, provides acomprehensive, worldwide gridded solar radiation data set basedon satellite data.There may be two TMYx files for a location. For example, for Luxembourg Airport:LUX_LU_Luxembourg.AP.065900_TMYx.epw - data used is derived from the entire applicable periodLUX_LU_Luxembourg.AP.065900_TMYx.2007-2021.epw - data used is derived from the most recent 15 years (2007-2021)Not all locations have recent data.This site contains KML map links to files contained on the site. Each KML is posted on the first page of each WMO region. KMLspoint to the datasets contained in the WMO region. (Possiblymultiple KMLs for some regions)Download the KML and open in Google Earth or Google Earth for Chrome News:

April 2022 - Completely updated worldwide TMYx dataset whichadds more than 2500 new locations (>15% increase), bringingthe total to more than 16,100 locations. These includeweather station meteorology data through 2021 andcorresponding solar radiation from theERA5 reanalysis data set. The ERA5 data, courtesy ofOikolab, provides a comprehensive, worldwide gridded solar radiationdata set based on satellite data. The new data (and allother weather files on the site including the 2004-2018TMYx) also now include the latest ASHRAE 2021 designconditions.

This page supplies both typical (most representative of a span of years) and historical (single year) weather data for 86-127 and 127 California weather stations, respectively.

Historical Weather Files: The historical weather data is presented by year, starting with 2014 for 131 locations, of which 122 have data for all 8 years. Current year data is updated daily. Data for the current year uses modeled solar radiation data. The year prior to the current year also used modeled solar radiation data until the satellite-derived radiation data for the year prior to the current year becomes available. The weather data for the year prior to the current year is updated, using the satellite-derived radiation data, in approximately July of the current year. Read More

Heavy snow will extend from the mountains of California and the Intermountain West into the Northern Plains. Gusty to strong winds may produce critical fire weather risks over portions of the Central and Southern High Plains. Multi-hazard impacts will stretch from the Lower Mississippi Valley to the Great Lakes by Friday into the weekend. Read More >

A collection of weather files is supplied with WUFI. Please note the sources given below from which you can obtain weather data for additional locations. Unless noted otherwise, WUFI can read the respective data formats; it is for the user to decide whether the data are suitable for the purpose at hand.

Depending on the aim of the investigation, appropriately selected weather data should be used. For example, if the typical long-term moisture balance of a component is to be determined, typical weather data which are representative for the location are appropriate. For design purposes, the performance or durability of a component exposed to more severe conditions is of interest, and weather data describing such a more demanding scenario should be used. If the cause of a specific damage case is to be investigated, weather data for the relevant time and location are needed.

WUFI can read a variety of weather data formats. Different weather data formats may comprise different sets of weather elements. All common weather data formats contain temperature and relative humidity; solar radiation is sometimes only given in terms of global radiation; rain is often missing. Therefore, the user must make sure that the weather file to be used contains at least all the weather elements which are needed for the planned investigation. The same applies to weather data which the user has obtained in order to create a weather file to be read by WUFI: it must be made sure that all weather elements are present which are needed for this simulation, and a file format must be chosen which can accomodate all these weather elements.

Since night-time overcooling is often relevant for the simulation but counterradiation data are rarely available, WUFI can estimate the atmospheric and terrestrial thermal emissions from other weather elements. For this purpose, it can use a variety of simplified models, depending on which weather elements are known. For example, the atmospheric counterradiation can be estimated from hourly data on the cloud cover, if these are available. If cloud cover data are missing, too, WUFI can instead use a constant cloud cover specified by the user (see the on-