I happened across this about squash on the NCSU web site at
http://www.ces.ncsu.edu/depts/hort/hil/pdf/hil-24-a.pdf ...
"Under certain environmental conditions and with certain cultivars, female blossoms may be present and open before male blossoms. Without available pollen from male blossoms, fruit will not set. This situation will typically correct itself within a few days when male blossoms begin to open in conjunction with female blossoms."
I guess the boys & girls in your area are just like those in mine, always on different schedules! Good luck with the pollination. By the way, the above fact sheet recommends that if you don't have enough bees around .. bring in some more. Don't think I'm going THAT far. :-)