GRAINS-Corn, wheat, soybeans climb as hot weather threatens U.S. crops

* Most active CBOT corn contract reaches 1-year high

* Hot weather forecast to spread to western corn belt

* Soybeans hit four-month high, wheat up sharply too

(Updates with European trading, changes byline/dateline) PARIS/SYDNEY, July 10 (Reuters) - U.S. corn, wheat and soybean futures rose sharply on Monday, with corn prices hitting a one-year high, as forecasts for soaring temperatures in some major growing belts raised fears of potential crop losses. The most active corn futures on the Chicago Board of Trade rose 2.1 percent to $4.13-1/4 a bushel at 1017 GMT, just off a session high of $4.13-1/2 that marked its highest level since June 21, 2016. Sizzling temperatures in the northern U.S. Plains spring wheat belt will spread this week into parts of the western Midwest, threatening corn yield prospects as the crop enters its key pollination phase. "Concerns about dryness in the western areas of the U.S. Corn Belt continue to grain traction," said Hannah Janson, chief analyst at Profarmer. "This crop is currently at the pollination stage, and this has heightened concerns about the effects that hot and dry weather could have on this crop." Weather concerns have in recent weeks been focused on wheat due to dry, hot conditions that have wilted spring wheat crops in the northern Plains. The high temperatures forecast spurred a fresh surge in Minneapolis spring wheat futures, which added over 3 percent to approach $8. On CBOT, the most active wheat futures rose 2.9 percent to $5.50-3/4 a bushel, although it remained below last week's two-year high of $5.74-1/2. Soybean futures rose 2.2 percent to $10.37-3/4 a bushel. They earlier climbed to $10.39-3/4 a bushel, their highest since March 7. "The dry and hot weather currently observed in the U.S. will surely be the animating factor of the market during the beginning of the week right before the USDA report of Wednesday," consultancy Agritel said in a note. The U.S. Department of Agriculture (USDA) will issue closely followed monthly supply and demand forecasts on July 12. Grain markets will also have the chance to gauge U.S. crop prospects on Monday when the USDA publishes its weekly crop progress report.

Prices at 1017 GMT

Last Change Pct End Ytd Pct Move 2016 Move CBOT wheat 550.75 15.75 2.94 408.00 34.99 CBOT corn 413.25 8.50 2.10 352.00 17.40 CBOT soy 1037.75 22.25 2.19 1004.00 3.36 Paris MAT wheat Sep 182.00 3.00 1.68 168.00 8.33 Paris maize Jun 173.50 2.00 1.17 166.00 4.52 Paris rape Aug 374.75 5.50 1.49 408.50 -8.26 WTI crude oil 43.90 -0.33 -0.75 53.72 -18.28 Euro/dlr 1.14 0.00 -0.12

Most active contracts - Wheat, corn and soy US cents/bushel, Paris futures in euros per tonne

(Editing by Christian Schmollinger and Alexander Smith)