Is EPW an aggregate of multiple years?

[crz_06]

I don’t understand this, is a EPW file and aggregate/combinations of multiple years? And if so, then how accurate is it?

lb_model_year.gh (19.6 KB)

I was expecting that a downloaded EPW would contain data from multiple years, and I can extract it by year to get an historic overview. Or am I missing something?

[Erikbeeren]

Hi @crz_06
The EPW file represents a typical meteorological year (TMY), put together with data of different years.
This is done to have a better overall estimation of how the building is going to perform.
If you want to use actual meteorological years (AMY) you can generate them with the dragonfly plugin “DF create EPW”.
Sometimes for comparing real energy use or comfort questions this can be usefull.

[crz_06]

Ah, I see. Is there like an equivalent of EPW Map to download such files for a specific year?

this NOAA import seems interesting

[Erikbeeren]

Hi @crz_06,

You can look on this forum. There is a lot of information on this subject. For exemple here:

Looking for Beta Testers for Weather Data Service

Hello everyone, For the last year or so, I’ve been working on making historical weather reanalysis data (e.g. ERA5 Reanalysis) more accessible. Despite the comprehensiveness and the quality of the data, it’s not widely used due to the effort required to process the data. I’ve recently launched a service to access this data more easily and looking for beta testers. You can sign up at https://oikolab.com, creating an account and adding a subscription to ‘Starter’ to get access to historical rean…

Weather and Climate Data API for Analysts

[Julioamodia89]

Hi,

I have over 20 years of hourly weather data from a weather station, and I’d like to use it to generate a Typical Meteorological Year (TMY) file. Is it possible to do this using Ladybug Tools?

Thanks