Rh and temperature are interrelated. Relative humidity lowers as the 
temperature increases and drops as the room cools. Warm air can "carry" 
more humidity so the "relative" humidity drops.
Too simple? I have equations to figure the absolute and relative 
humidities... but, as my family says "Too much info, dad -"
Dave Maschino

Westwood Leeanne wrote:

> Hi to everyone
>
> Please help!! I am just analyzing the data from our museums electronic 
> relative humidity dataloggers and I have found an unusual fluctuation 
> in the readings. At one point over the weekend, when we are closed, 
> the temperature in a certain room consistently dropped, but at the 
> same time, so did the Relative Humidity!. Please can anyone explain 
> what would cause the relative humidity to drop at the same time as the 
> temperature?
>
> Thanks
>
> *Leeanne Westwood*
>
> *Senior Museum Assistant*
>
> Valence House Museum
>
> London Borough of Barking and Dagenham
>
> Becontree Avenue
>
> Dagenham
>
> RM8 3HT
>
> Tel: 020 8270 6744
>
> Fax: 020 8270 6868
>
> [log in to unmask] 
>
> Website: _www.barking-dagenham.gov.uk_ 
> <http://www.barking-dagenham.gov.uk>
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