Agree with turkey buster, i have bagged grouse pretty much anytime if the day everyyear, i used to get up at the b-crack of dawn and head out but a few years ago i started going out later (after 9am) and did just as good in all my normal spots, they are birds, they eat,water,grit all day long not just from 6am till 8am, then from 6pm till 8pm. Not sure temp makes a huge difference unless it is a really hot year.