You can also check out the Honey Bee Net project on the NASA website:

http://honeybeenet.gsfc.nasa.gov/Sites/SHData.htm

You can read about the objectives of the project elsewhere on the website, but the link I've given will take you to a page where you can click on site locations to see specific data on weight gain/loss, averages, etc.  Something local to you might help give you a sense of when the flow begins and ends in your area, although you won't find honey yields.

###################################
Bill
Claremont, NH
+43.35687 +43° 21’ 25”
-72.3835   -72° 23’ 01”
CWOP: D5065
Weather Underground: KNHCLARE3
HonetBeeNet: NH001

             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html

Guidelines for posting to BEE-L can be found at:
http://honeybeeworld.com/bee-l/guidelines.htm