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From 1971 to 2005 the average annual observed temperature in the Snake River Plain, located in southern Idaho, has increased by 1.4 degrees Celsius based on data from 10 climate stations (Dubois, Ashton, Oakely, Pocatello, Aberdeen, Hazelton, Jerome, Boise, Nampa, and Payette).
The average annual rainfall for the island is 86 inches (2,200 mm). [74] There is a distinct dry season from January to June, and a rainy season from July to December. [75] Typhoons frequent the island, which can lead to excessive rainfall. During El Niño years, dry season precipitation averages below normal.
For instance, northern Idaho experiences more precipitation in rain and snow than eastern Washington from weather systems originating from the Pacific Ocean because it is on the windward side of the Rocky Mountains. [75] Average annual rainfall is 25 inches (64 cm) and the average annual snowfall is 46 inches (120 cm). [76]
Average annual precipitation ranges from 30 inches (760 mm) to 35 inches (890 mm), depending on the specific area within Sagle and local geography. Geography [ edit ]
Köppen climate types of Idaho, using 1991-2020 climate normals.. Idaho's climate varies widely. Although the state's western border is about 330 miles (530 km) from the Pacific Ocean, the maritime influence is still felt in Idaho; especially, in the winter when cloud cover, humidity, and precipitation are at their maximum extent.
Riparian area in Blaine County, Idaho. Over the last century, the average temperature near Boise, Idaho, has increased nearly 1°F, and precipitation has increased by nearly 20% in many parts of the state, and has declined in other parts of the state by more than 10%. These past trends may or may not continue into the future.
But what does that mean for the state’s drought? As of Oct. 24, total precipitation was 10.74 inches below normal, Vanessa Pearce, forecaster for the National Weather Service, said. The totals ...
Teton Valley has an average annual precipitation at the 6,100 ft. level of 15.9 inches (2004). The average snowfall is 73.7 inches. In July, the highest average daily maximum temperature is 81.7 °F (27.6 °C). In January, the lowest average daily minimum temperature registers at 6.4 °F (−14.2 °C).