Evaluating the Transport and Fate of Nutrients in Large Scale River Basins Using an Integrated Modeling System - Landscape Ecology for Sustainable Environment and Culture - page 184

Fig. 10.3 UMRB land use and land cover

of nitrogen and phosphorous lost from the land to the stream in the UMRB is higher
than in any other portion of the MRB (Fig. 10.3 ).
The climate of the UMRB is subhumid continental. The climate of the UMRB,
which encompasses most of Illinois, Iowa, Minnesota, Missouri, and Wisconsin, is
humid continental, with warm, moist summers and cold, dry winters. Average
monthly temperatures vary significantly throughout the year, with maximums in
July and minimums in January. The majority of the precipitation (approximately
three-fourths) occurs between April and October. Average annual rainfall for the
area is 91 cm. Monthly average temperatures range from -12 to 0 C for January
to 22-27 C in July, with a year-round average of about 11 C. Flows comprised
of runoff from the UMRB's stream network support navigation and hydroelectric
plants and fulfill municipal, industrial, and agricultural water requirements.