<P> Texas' weather varies widely, from arid in the west to humid in the east . The huge expanse of Texas encompasses several regions with distinctly different climates: Northern Plains, Trans - Pecos Region, Texas Hill Country, Piney Woods, and South Texas . Generally speaking, the part of Texas that lies to the east of Interstate 35 is subtropical, while the portion that lies to the west of Interstate 35 is arid desert . </P> <P> Texas ranks first in tornado occurrence with an average of 139 per year . Tropical cyclones can affect the state, either from the Gulf of Mexico or from an overland trajectory originating in the eastern Pacific Ocean . Those originating from the Gulf of Mexico are more likely to strike the upper Texas coast than elsewhere . Significant floods have occurred across the state throughout history, both from tropical cyclones and from stalled weather fronts . </P> <Table> Monthly normal high and low temperatures (° F) for various Northern Plains cities <Tr> <Th> City </Th> <Th> Jan </Th> <Th> Feb </Th> <Th> Mar </Th> <Th> Apr </Th> <Th> May </Th> <Th> Jun </Th> <Th> Jul </Th> <Th> Aug </Th> <Th> Sep </Th> <Th> Oct </Th> <Th> Nov </Th> <Th> Dec </Th> </Tr> <Tr> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> </Tr> <Tr> <Th> Abilene </Th> <Td> 55 / 32 </Td> <Td> 61 / 37 </Td> <Td> 69 / 44 </Td> <Td> 77 / 52 </Td> <Td> 85 / 61 </Td> <Td> 91 / 69 </Td> <Td> 95 / 72 </Td> <Td> 94 / 71 </Td> <Td> 87 / 64 </Td> <Td> 78 / 54 </Td> <Td> 65 / 42 </Td> <Td> 57 / 34 </Td> </Tr> <Tr> <Th> Amarillo </Th> <Td> 49 / 23 </Td> <Td> 54 / 27 </Td> <Td> 62 / 34 </Td> <Td> 71 / 42 </Td> <Td> 79 / 52 </Td> <Td> 87 / 61 </Td> <Td> 91 / 65 </Td> <Td> 89 / 64 </Td> <Td> 82 / 56 </Td> <Td> 72 / 45 </Td> <Td> 58 / 32 </Td> <Td> 50 / 24 </Td> </Tr> <Tr> <Th> Lubbock </Th> <Td> 52 / 24 </Td> <Td> 58 / 29 </Td> <Td> 66 / 36 </Td> <Td> 75 / 45 </Td> <Td> 83 / 56 </Td> <Td> 90 / 64 </Td> <Td> 92 / 68 </Td> <Td> 90 / 66 </Td> <Td> 83 / 58 </Td> <Td> 74 / 47 </Td> <Td> 62 / 35 </Td> <Td> 53 / 26 </Td> </Tr> <Tr> <Th> Midland </Th> <Td> 60 / 29 </Td> <Td> 66 / 34 </Td> <Td> 74 / 41 </Td> <Td> 82 / 48 </Td> <Td> 89 / 58 </Td> <Td> 94 / 65 </Td> <Td> 96 / 68 </Td> <Td> 94 / 67 </Td> <Td> 88 / 61 </Td> <Td> 80 / 51 </Td> <Td> 68 / 39 </Td> <Td> 61 / 31 </Td> </Tr> <Tr> <Th> San Angelo </Th> <Td> 58 / 29 </Td> <Td> 63 / 34 </Td> <Td> 71 / 42 </Td> <Td> 79 / 50 </Td> <Td> 86 / 59 </Td> <Td> 91 / 66 </Td> <Td> 95 / 70 </Td> <Td> 94 / 68 </Td> <Td> 88 / 63 </Td> <Td> 79 / 51 </Td> <Td> 67 / 39 </Td> <Td> 59 / 31 </Td> </Tr> <Tr> <Th> Wichita Falls </Th> <Td> 52 / 29 </Td> <Td> 58 / 34 </Td> <Td> 67 / 41 </Td> <Td> 76 / 49 </Td> <Td> 84 / 59 </Td> <Td> 92 / 68 </Td> <Td> 97 / 72 </Td> <Td> 96 / 71 </Td> <Td> 88 / 64 </Td> <Td> 77 / 52 </Td> <Td> 64 / 40 </Td> <Td> 54 / 31 </Td> </Tr> </Table>

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