. Southeast Montana wetland assessment : developing and refining Montana's wetland assessment and monitoring strategy . Figure 3. Extent of the Powder River Basin within the southeastern Montana project area. Climate and Hydrology The climate of the study area is continental and typical of the Great Plains with cold winters and warm, dry summers (McNab and Avers 1994). Average annual precipitation ranges from 11 to 15 inches (28 to 38 cm), with peak precipitation periods occurring in May and June. Highest maximum daily temperatures occur during July and August with temperatures averaging 8
. Southeast Montana wetland assessment : developing and refining Montana's wetland assessment and monitoring strategy . Figure 3. Extent of the Powder River Basin within the southeastern Montana project area. Climate and Hydrology The climate of the study area is continental and typical of the Great Plains with cold winters and warm, dry summers (McNab and Avers 1994). Average annual precipitation ranges from 11 to 15 inches (28 to 38 cm), with peak precipitation periods occurring in May and June. Highest maximum daily temperatures occur during July and August with temperatures averaging 85° to 88° F (29° to 31° C). The relative effective annual precipitation (REAP), which is an indicator of the amount of moisture available at a given location accounting for precipitation, slope, aspect, and soil properties, ranges from a low of 9 inches (24 cm) in the breaks area in the northern portion of the study area to 22 inches (55 cm) in the buttes and mesic plains of the east and south (Figure 4). Major rivers in the study area are the Powder and the Tongue Rivers, both of which begin in Wyoming and flow north into the Yellowstone River. The Little Missouri River flows across the southeastern portion of the study area into the Missouri River in North Dakota. Other major streams include O'Fallon Creek, Mizpah Creek, and Box Elder Creek. The Tongue River 4
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