Typical Meteorological Year
Download a statistically representative “typical year” file built from 15 + years of satellite data for long-term yield modelling.
High-resolution & accurate historical solar irradiance and weather data built for solar
Access the world’s most accurate historical irradiance and weather data through our historical weather API. The Solcast API provides 20+ weather parameters tailored to solar energy applications, from 2007 to 7 days ago. Available instantly via synchronous JSON API or as an instant CSV web download.
The complete suite of irradiance and weather data required for effective monitoring, operation, and forecasting at your large-scale solar farm.
The complete suite of irradiance and weather data required for effective monitoring, operation, and forecasting at your large-scale solar farm
Designed for solar, from the ground up. Never rely on generic weather model data again. Solcast’s real-time, forecast, and historical weather API track real clouds at 1–2 km and 5-minute resolution. Irradiance and PV power data update every 5 minutes and are downscaled to 90-metre resolution, with explicit modeling of aerosol and albedo effects.
Access high-resolution weather and irradiance data for any global location via our historical weather API as part of the Solcast API.
Weather data from leading reanalysis datasets completes the full suite of 20+ parameters available at 5, 10, 15, 30 and 60 minute resolutions. Coverage from 2007 to 7 days ago.
Be confident that our data is fit for purpose.
Our team of meteorologists and data scientists publish site-by-site validation so you can trust the performance of our historical weather API outputs.
Review global, regional and climate-zone results in our bankability validation.
Our synchronous historical weather API returns JSON within 1–5 seconds per request.
Requests can be run in parallel up to your account’s rate limit.
Web downloads allow up to 20 locations at a time across multiple formats, including CSV ready for common simulation tools.
Geographic covereage
Global (note: far ocean and polar regions are coarser resolution)
Temporal coverage
January 2007 to 7 days ago (for past 7 days to present time and forecasts, use our Live and Forecast data)
Temporal resolution
5, 10, 15, 30 & 60 minutes (period-mean values)
Spatial resolution
90 meters (irradiance, PV power, snow soiling, cloud parameters, andother parameters across all regions)
Data parameters
The following data parameters are available.
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Irradiance Parameters
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Solar Parameters
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Weather Parameters
Data access
API or Web download
Download wait time
API: synchronous requests. Web download: seconds.
File formats
CSV, JSON, PVsyst, SAM, TMY3
Data formats
Solcast standard, PVsyst (60 minute only)
Time zone
UTC, longitudinal, or user-specified fixed offset.
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Check how Solcast Historical Time Series compares with other irradiance and weather data.
What is a Historical Weather API?
A Historical Weather API provides past weather and irradiance data—such as GHI, DNI, temperature, cloud cover, and wind—delivered programmatically via JSON or downloadable files. Solcast’s Historical Weather API offers high-resolution, satellite-derived data from 2007 to 7 days ago, specifically tailored for solar energy applications.
What can I use historical weather data for?
Historical weather data is critical for solar projects, providing accurate resource assessment, long-term performance benchmarking and monitoring. Historical weather dat also enables gap-filling for missing sensor data.
How is time series data generated in the historical weather API?
Solcast uses an ensemble of global NWP weather data sources and historical satellite imagery to track clouds globally. Data is captured at native resolution from available data sources and downscaled to 90m based on terrain, aerosol and cloud data available.
How accurate is Solcast’s historical weather API?
Solcasts historical data has been validated as bankable by DNV in a global 207 site study. See the details in DNV's Bankability Report.
What locations are supported?
The Historical Weather API provides global coverage, with 90-metre irradiance resolution across all non-polar, continental regions and 27-kilometre resolution for other weather parameters and remote areas.
How does Solcast’s historical weather API compare with other providers?
The solcast API is built for the renewable energy industry. Some alternative weather APIs exist for general weather purposes, and some renewable energy data providers have APIs to access their data. Explore our historical and TMY data comparisons.
What time range does the historical dataset cover?
You can access data from January 2007 up to 7 days ago. This time horizon updates every 5 minutes For real-time and forecast data, use our Live Solar Data and Solar Forecast Data.