<Tr> <Th> Mean maximum ° F (° C) </Th> <Td> 38.8 (3.8) </Td> <Td> 43.3 (6.3) </Td> <Td> 55.0 (12.8) </Td> <Td> 71.9 (22.2) </Td> <Td> 80.9 (27.2) </Td> <Td> 85.4 (29.7) </Td> <Td> 88.7 (31.5) </Td> <Td> 86.7 (30.4) </Td> <Td> 81.7 (27.6) </Td> <Td> 72.4 (22.4) </Td> <Td> 54.7 (12.6) </Td> <Td> 39.5 (4.2) </Td> <Td> 90.2 (32.3) </Td> </Tr> <Tr> <Th> Average high ° F (° C) </Th> <Td> 18.9 (− 7.3) </Td> <Td> 24.0 (− 4.4) </Td> <Td> 34.4 (1.3) </Td> <Td> 49.2 (9.6) </Td> <Td> 62.2 (16.8) </Td> <Td> 70.8 (21.6) </Td> <Td> 76.3 (24.6) </Td> <Td> 74.3 (23.5) </Td> <Td> 65.0 (18.3) </Td> <Td> 51.5 (10.8) </Td> <Td> 35.6 (2) </Td> <Td> 22.3 (− 5.4) </Td> <Td> 48.71 (9.28) </Td> </Tr> <Tr> <Th> Average low ° F (° C) </Th> <Td> 1.5 (− 16.9) </Td> <Td> 6.1 (− 14.4) </Td> <Td> 17.5 (− 8.1) </Td> <Td> 30.0 (− 1.1) </Td> <Td> 40.6 (4.8) </Td> <Td> 49.3 (9.6) </Td> <Td> 55.4 (13) </Td> <Td> 54.4 (12.4) </Td> <Td> 46.1 (7.8) </Td> <Td> 34.8 (1.6) </Td> <Td> 21.9 (− 5.6) </Td> <Td> 7.3 (− 13.7) </Td> <Td> 30.41 (− 0.88) </Td> </Tr> <Tr> <Th> Mean minimum ° F (° C) </Th> <Td> − 23.2 (− 30.7) </Td> <Td> − 19.4 (− 28.6) </Td> <Td> − 8 (− 22) </Td> <Td> 13.9 (− 10.1) </Td> <Td> 27.8 (− 2.3) </Td> <Td> 36.6 (2.6) </Td> <Td> 43.2 (6.2) </Td> <Td> 42.1 (5.6) </Td> <Td> 30.9 (− 0.6) </Td> <Td> 20.6 (− 6.3) </Td> <Td> 2.1 (− 16.6) </Td> <Td> − 16.7 (− 27.1) </Td> <Td> − 26.1 (− 32.3) </Td> </Tr>

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