Deaver is a town in Big Horn County, Wyoming, United States. The population was 178 at the 2010 census.
Deaver is located at 44°53′26″N 108°35′49″W (44.890439, −108.596860).
According to the United States Census Bureau, the town has a total area of 1.01 square miles (2.62 km2), all of it land.
Deaver is located in a sheltered valley to the west of the Big Horn Mountains and has a cold desert climate (Köppen BWk), a very rare type of climate so far north in North America and due to its very shielded location from moisture-bearing winds. Winters are almost snowless despite being very cold, with a median snowfall of only 1.4 inches (3.6 cm), though as much as 12.1 inches (30.73 cm) fell in April 1973. In the summer, days can be hot but humidity is low and nights are pleasantly cool. The shielded location means that the very limited rainfall of around 5.5 inches (140 mm) is confined to late spring and early summer thunderstorms.
As of the census of 2010, there were 178 people, 66 households, and 48 families residing in the town. The population density was 176.2 inhabitants per square mile (68.0/km2). There were 84 housing units at an average density of 83.2 per square mile (32.1/km2). The racial makeup of the town was 96.6% White, 2.8% from other races, and 0.6% from two or more races.