Solargis Long-term averages API

  • Published on Jul 17, 2025
  • 2 minute(s) read
  • MK
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In this document

You will find an overview of the key parameters provided by the Solargis long-term averages (LTA) API, including their API response acronyms, units of measurement, and key parameters.

Overview

Accurate and rapid estimation of solar energy potential is essential during the pre-feasibility phase of solar projects. The Solargis long-term averages (LTA) API provides a robust solution, enabling swift prefeasibility photovoltaic (PV) yield calculations and delivering comprehensive long-term solar and meteorological data summaries—available as monthly and/or yearly aggregates—via a reliable API.

Solargis LTA API is offered as a single-plan subscription, and you can purchase it by contacting our sales team.

Main features of the Solargis LTA API

  • Fast API integration: Immediate access to datasets through seamless API connectivity.

  • Quick PV potential assessment: Evaluate the photovoltaic potential of prospective sites within seconds using global PVOUT data.

  • Comprehensive global coverage: Access long-term average solar and meteorological data for locations worldwide.

  • Real-time data processing: Integrate and process API data directly in your prospection and planning software.

  • Custom application development: Build tailored applications and services for clients using robust, reliable datasets.

Key parameters of Solargis LTA API data

Parameter

Temporal coverage

Solar parameters

1994/1999/2005/2007/2018/2019 – end of 2024

Meteorological parameters

1994 – 2024

Albedo

2006 – 2015

Note: Temporal coverage for solar parameters depends on the specific region. Refer to the map for temporal coverage in specific regions.

Data parameters available in the Solargis LTA API

Parameter

LTA API response acronym

Unit

Description

Global horizontal irradiation (GHI)

Ghm / Ghd

kWh/m²

Ghm: Average monthly and yearly sum of global horizontal irradiation.
Ghd: Average daily value for each month and the yearly average.

Direct normal irradiation (DNI)

Dnm / Dnd

kWh/m²

Dnm: Average monthly and yearly sum of direct normal irradiation.
Dnd: Average daily value for each month and the yearly average.

Diffuse horizontal irradiation (DIF)

Dhd

kWh/m²

Average daily value of diffuse horizontal irradiation, provided for each month and as a yearly average.

Global tilted irradiation (GTI)

Gim / Gid

kWh/m²

Gim: Average monthly and yearly sum of global irradiation on a tilted surface.
Gid: Average daily value for each month and the yearly average.

Ground surface albedo (ALB)

Alb

–

Average monthly and yearly ratio of solar irradiance reflected from the ground surface (albedo), calculated as the ratio of upwelling to downwelling fluxes.

Air temperature at 2 m (TEMP)

Td, Tmin, Tmax

°C

Td: Average; Tmin: minimum; Tmax: maximum monthly values of air temperature at 2 m above ground. Yearly values are provided for Td.

Wind speed at 10 m (WS)

Ws

m/s

Average monthly and yearly wind speed measured at 10 m above ground.

Relative humidity (RH)

Rh

%

Average monthly and yearly relative humidity at 2 m above ground.

Precipitation (PREC)

Prec

mm

Average monthly and yearly total precipitation (rainfall).

Precipitable water (PWAT)

Pwat

kg/m²

Average monthly and yearly column-integrated water vapor, representing total atmospheric moisture above ground.

PVOUT

Esm / Esd / Etm

kWh/kWp
kWh

Esm: Average monthly and yearly specific PV electricity output.
Esd: Average daily specific output per month.
Etm: Total PV production in kWh.

How to integrate

You can learn how to integrate and use the Solargis LTA API in the Solargis LTS API documentation.