# Degree Days

![](https://894783789-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LPHXQ1I3gb93zpLrLZf%2Fuploads%2Fgit-blob-103df500343c467f0798b59598976103f2ff4b50%2FDegree_Days.png?alt=media)

![](https://894783789-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LPHXQ1I3gb93zpLrLZf%2Fuploads%2Fgit-blob-5998fa8dd35981231d3b40f5da46078b6e8e5b29%2FDegree_Days.png?alt=media) - [\[source code\]](https://github.com/ladybug-tools/ladybug-grasshopper/blob/master/ladybug_grasshopper/src/LB%20Degree%20Days.py)

Calculate heating and cooling degree-days from outdoor dry bulb temperature.

### Inputs

* **dry\_bulb \[Required]**

A data collection representing outdoor dry bulb temperature \[C]

* **heat\_base**

A number for the base temperature below which a given hour is considered to be in heating mode. Default is 18 Celcius, which is a common balance point for buildings.

* **cool\_base**

A number for the base temperature above which a given hour is considered to be in cooling mode. Default is 23 Celcius, which is a common balance point for buildings.

### Outputs

* **hourly\_heat**

A data collection of heating degree-days. Plug this into the 'Time Interval Operation' component to get the number of degree-days at different time intervals.

* **hourly\_cool**

A data collection of cooling degree-days. Plug this into the 'Time Interval Operation' component to get the number of degree-days at different time intervals.

* **heat\_deg\_days**

A value indicating the total number of heating degree-days over the entire input \_dry\_bulb collection.

* **cool\_deg\_days**

A value indicating the total number of cooling degree-days over the entire input \_dry\_bulb collection.