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* CBOT September corn ended up 5 cents at $3.52 a bushel, while new-crop December corn ended up 5-1/4 cents at $3.64-1/4.
* The market will be closed on Wednesday for the US Independence Day holiday.
* Concerns about hot weather in the US corn belt during the crop's critical pollination stage of development this month underpinned prices. Recent heavy rains have also hurt crop prospects in southern Minnesota and northern Iowa, a heavy corn production region.
* The US Department of Agriculture late Monday rated 76 percent of the US corn crop as good to excellent, down from 77 percent the previous week and in line with trade expectations.
* CBOT July corn deliveries totaled 369 contracts.