# Create EPW

![](/files/-MihrciNv2dmYaLR1_h9)

![](/files/-MihraPl8WtZC2GBEvp6) - [\[source code\]](https://github.com/ladybug-tools/dragonfly-grasshopper/blob/master/dragonfly_grasshopper/src//DF%20Create%20EPW.py)

Create a custom EPW object from a location and data collections of annual hourly data.

## Inputs

* **location \[Required]**

  A location object for the epw\_file. 
* **dry\_bulb\_temp**

  Annual hourly data collection for dry bulb temperature \[C] 
* **dew\_point\_temp**

  Annual hourly data collection for dew point temperature \[C] 
* **wind\_speed**

  Annual hourly data collection for wind speed \[m/s] 
* **wind\_direction**

  Annual hourly data collection for wind direction \[degrees] 
* **direct\_normal\_rad**

  Annual hourly data collection for direct normal radiation \[Wh/m2] or \[W/m2] 
* **diffuse\_horiz\_rad**

  Annual hourly data collection for diffuse horizontal radiation \[Wh/m2] or \[W/m2] 
* **horiz\_infrared\_rad**

  Annual hourly data collection for horizontal infrared radiation intensity \[Wh/m2] or \[W/m2] 
* **direct\_normal\_ill**

  Annual hourly data collection for direct normal illuminance \[lux] 
* **diffuse\_horiz\_ill**

  Annual hourly data collection for diffuse horizontal illuminance \[lux] 
* **total\_sky\_cover**

  Annual hourly data collection for the fraction for total sky cover \[tenths] 
* **atmos\_pressure**

  Annual hourly data collection for weather station pressure \[Pa] 
* **visibility**

  Annual hourly data collection for visibility \[km] 
* **ceiling\_height**

  Annual hourly data collection for cloud ceiling height \[m] 
* **model\_year**

  Annual hourly data collection for the year from which the hourly data has been extracted. This input is necessary when the input data collections are from a leap year. 
* **base\_epw**

  File path to an optional .epw to fill empty slots for data that has not been connected here. 
* **run \[Required]**

  Set to True to run the component and create the epw\_obj. 

## Outputs

* **report**

  Reports, errors, warnings, etc. 
* **epw\_obj**

  An EPW object that can be written to a file using the Write EPW component. 


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.ladybug.tools/dragonfly-primer/components/6_alternativeweather/create_epw.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.