<Tr> <Th> State </Th> <Th> 2017 Estimate </Th> <Th> 2010 Census </Th> <Th> Change </Th> <Th> Area </Th> <Th> Density </Th> </Tr> <Tr> <Td> Arizona </Td> <Td> 7,016,270 </Td> <Td> 6,392,017 </Td> <Td> 7000976613485226960 ♠ + 9.77% </Td> <Td> 113,591.04 sq mi (294,199.4 km) </Td> <Td> 62 / sq mi (24 / km) </Td> </Tr> <Tr> <Td> Colorado </Td> <Td> 5,607,154 </Td> <Td> 5,029,196 </Td> <Td> 7001114920555890050 ♠ + 11.49% </Td> <Td> 103,641.81 sq mi (268,431.1 km) </Td> <Td> 54 / sq mi (21 / km) </Td> </Tr> <Tr> <Td> Idaho </Td> <Td> 1,716,943 </Td> <Td> 1,567,582 </Td> <Td> 7000952811399977800 ♠ + 9.53% </Td> <Td> 82,643.05 sq mi (214,044.5 km) </Td> <Td> 21 / sq mi (8 / km) </Td> </Tr>

What is the climate in the west region of the united states