Weather Banter - View Single Post

Will Hand · August 2nd 17, 08:56 PM posted to uk.sci.weather

On Wed, 2 Aug 2017 19:22:43 +0100
Nick Gardner wrote:

On 02/08/2017 09:22, d wrote:
Perhaps I'm wrong, but to me this summer seems to have been constantly
humid down here in London regardless of temperature or cloud cover. Is this
actually the case or am I imagining it?

Dew points give a good indication to how 'humid' it feels and the
following are the average maximum daily dew points for here from 1st
June - 31st July:

2015 = 15.2C
2016 = 17.0C
2017 = 16.8C.

So yes, this summer has been 'humid' but slightly less so than last
year, though last year the weather often did feel quite oppressive at times.

Certainly humid today, temp = 18.3C, DP = 18.3C; drizzle.

Dewpoints are of course related to specific humidity. Relative humidity will
vary a lot both diurnally and in precipition of course. A temperature of 10C
with a dewpoint of 10C will give the same RH as a temperature of 20C with a
dewpoint of 20C. But the specific humidity at 20C is considerably higher than
that at 10C.

Will
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