Is there anywhere in the United States where the temperature is
between 40 and 80 degrees F throughout the year?

Hello thejenn:

Unfortunately, you're never going to find any place (on Earth much
less in the U.S.) that *always* - 365 days a year, 24 hours a day - is
between 40 and 80 degrees.

however, what I've done is looked at major centers in the U.S. with
*monthly* average temperatures - which I think is the best type of
data for you to look at. The best such data comes from the NOAA.

NORMALS 1971-2000               
URL: http://www.ncdc.noaa.gov/oa/climate/online/ccd/nrmavg.txt

From that list, I was able to pick out the following cities that meet
your criteria:

* EUREKA, CA.  
* LONG BEACH, CA 
* LOS ANGELES C.O., CA
* SACRAMENTO, CA  
* SAN DIEGO, CA                    
* SAN FRANCISCO C.O., CA           
* SANTA BARBARA, CA                
* SANTA MARIA, CA                  
* STOCKTON, CA                     
* ATHENS, GA                       
* HILO, HI  ***
* KAHULUI, HI                      
* LIHUE, HI                        
* CAPE HATTERAS, NC   
* ASTORIA, OR                      
* SALEM, OR                        
* GREENVILLE-SPARTANBURG AP, SC    
* NORFOLK, VA                      
* QUILLAYUTE, WA                   
* SEATTLE C.O., WA                 

To see the actual monthly averages, please refer to the appropriate
rows of the table at NOAA.

For *really* nice temperatures, check out those cities in Hawaii where
it is around 70 degrees *year round*!

Search Strategy (on Google): 
* "average temperature" seattle miami nome site:.gov

Hope this helps.

websearcher

Thanks for the quick reply and all of the detail!