Looking for a weather map...

[Chris Koetters]

I am in search of a map of the United States showing the mean dew point on average over a year and if at all possible the past 30 years. I have found a couple that are the mean dew point for a month but not over a year.

Any suggestions on where to go or specific links would be greatly appreciated.

 

[rdale]

That doesn't sound like a common map as I can see how it has much value for forecasting... You might check with the NCDC and maybe they can make one up for you, but it probably won't be free.

 

[M Conder]

I think the Oregon State prism site has some of what you're looking for (1997-current)

http://www.prism.oregonstate.edu/