[BLDG-SIM] Extraction of rainfall data from TMY2 weather file

Autif Sayyed AutifS at TWGI.com
Mon Apr 24 15:23:37 PDT 2006

I am trying to extract hourly/ daily rainfall data from a TMY2 weather
file. I have pasted the EPW file in excel, with their respective
headers. According to the documentation on EPW and TMY2 formats, the
rainfall data is in the field, "Present Weather Codes", which is a 9
digit code, the 2nd digit of which indicates rainfall values as follows:

0=Light Rain
1= Moderate Rain
2= Heavy Rain
3= Light Rain showers
4= Moderate rain showers
5= Heavy rain showers
6= Light freezing rain
7= Moderate freezing rain
8= Heavy freezing rain
9= None/ unknown/ missing

Further notes say that 
Light= up to 0.25 cm/hour
Moderate= 0.28 to 0.76 cm/ hour
Heavy= greater than 0.76 cm/ hour

I am confused with this note. Do "Light Rain" and "Light Rain showers"
mean the same amount of rain, since they are both "Light"? In other
words, is there a definition of the range of rainfall in cm/ hour
between values of 0 to 5. Do values 6, 7 and 8 mean the same amount of
rainfall as 3, 4 and 5 respectively, just with a lower temperature?

Any help with this format will be greatly appreciated.

Autif Sayyed
The Weidt Group 

You received this e-mail because you are subscribed 
to the BLDG-SIM at GARD.COM mailing list.  To unsubscribe 
from this mailing list send a blank message to 

More information about the Bldg-sim mailing list