# [gradsusr] Calculating Dew point Temperature

Mohsen Soltani soltani.clima at gmail.com
Fri Aug 9 11:49:43 EDT 2013

```Hi Ahsan,

As far as I know, in order to calculate dewpoint temperature, you need to
have both temperature and relative humidity variables of that particular
level. You, however, may use the following functions to do so at 2 meters
above the ground:

**************************
tc2m = temperature 2m above ground [°C]
rh2m = relative humidity 2m above ground [%]

'define dewp2m = tc2m-((14.55+0.114*tc2m)*(1-0.01*rh2m)+pow((2.5+0.007*tc2m)
*(1-0.01*rh2m),3)+(15.9+0.117*tc2m)*pow((1-0.01*rh2m),14))'

***************************************

Good luck!
Mohsen

--
April showers bring May flowers!
--
*Mohsen Soltani, M.Sc.*
Department of Climatology, Faculty of Geography,
University of Tehran, Tehran, Iran
voice: (+98) 9119772934
e-mail: soltani.clima at gmail.com

On Fri, Aug 9, 2013 at 7:46 AM, Syed Ahsan Ali <ahsanshah01 at gmail.com>wrote:

>
> I want to calculate Dew point temprature from Relative humidity or
> Specific humidity.
> Anyone know how to calculate within grads.
> Thanks
> Ahsan
>
>
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