I previously posted regarding the low hummingbird population in Montgomery County, Maryland. I have also noticed many others posting on the same subject.

I just returned from a business trip/vacation to Tucson, AZ. I always visit the Arizona Sonora Desert Museum, where they have a wonderful hummingbird aviary (which I highly recommend if you are ever in southern Arizona). I ran into a very knowledgeable docent at the museum who happens to be an avid birder. I asked why the late hummingbirds and the low population. She told me the drought in the southeast has prevented the hummingbirds from coming north this year. She told me I should continue putting out the food because I may have visitors I don't even know about and to be patient. This woman seemed very credible and has visited Ecuador to see the hummingbirds there. I hope this helps -- it sure helped me.