Custom Search     Monsanto Number Fifteen Lake     How did that trip work out for you? Has anyone else been down to that lake? I would like to have more information on this lake if anyone has any. Says Kristen Dalton Going today to check out the lake. Has anyone fish this lake? 05.24/08 Says Laura Miller For the duration of the days of summer highs here at Monsanto Number Fifteen Lake get into the 80's. Once the sun is down it plunges down to the 60's. For the duration of the winter this place gets     highs in the 40's; overnight lows in the 20's for Monsanto Number Fifteen Lake. Monsanto Number Fifteen Lake usually gets a large amount of precipitation.            Map Detailed Map Weather Local weather forecast