---
title: "Get Historic Irradiance"
method: GET
path: "/data/historic/radiation_and_weather"
tags: ["Historic", "Radiation and Weather"]
---

# Get Historic Irradiance

`GET /data/historic/radiation_and_weather`

Get historical irradiance and weather estimated actuals for up to 31 days of data at a time for a requested location, derived from satellite (clouds and irradiance over non-polar continental areas) and numerical weather models (other data). Data is available from 2007-01-01T00:00Z to 7 days ago.

## Query parameters

- `format` 'json' | 'csv' | 'pvsyst', nullable
- `start` string, nullable, required
- `end` string, nullable
- `duration` string, nullable
- `time_zone` string, nullable
- `period` 'PT5M' | 'PT10M' | 'PT15M' | 'PT20M' | 'PT30M' | 'PT60M', nullable
- `tilt` number, float, nullable
- `azimuth` number, float, nullable
- `array_type` string, nullable
- `output_parameters` string[]
- `terrain_shading` boolean
- `latitude` number, double, nullable, required
- `longitude` number, double, nullable, required

## Response `200`

OK

- HistoricRadiationAndWeatherResponse
  - `estimated_actuals` object[], nullable

---

[API](https://skmtc.net/solcast/apis/solcast-api.md) · [All operations](https://skmtc.net/solcast/apis/solcast-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/solcast/solcast-api/revisions/591461e66c79/schema)