A list of photometric nights for all Northern CONCAMs is listed here. The list is based on the average ratio of the counts (C16) of Polaris in the same sidereal times. Each list gives the two night that are compared (photometry files of Polaris), the average ratio between the observation in first night to the observation in the second night in the same sidereal time, and the number of samples that were calculated (the number of matching observations in the same sidereal times).
When the average ratio is closer to 1, the two nights are photometric and might be OK for doing photometry.
http://nightskylive.net/temp/hl_photometry.txt
http://nightskylive.net/temp/mk_photometry.txt
http://nightskylive.net/temp/ci_photometry.txt
http://nightskylive.net/temp/kp_photometry.txt
http://nightskylive.net/temp/wo_photometry.txt