<Tr> <Th> Average high ° C (° F) </Th> <Td> 1.5 (34.7) </Td> <Td> 4.7 (40.5) </Td> <Td> 10.4 (50.7) </Td> <Td> 17.8 (64) </Td> <Td> 23.0 (73.4) </Td> <Td> 27.1 (80.8) </Td> <Td> 28.6 (83.5) </Td> <Td> 29.6 (85.3) </Td> <Td> 25.8 (78.4) </Td> <Td> 19.8 (67.6) </Td> <Td> 11.6 (52.9) </Td> <Td> 4.3 (39.7) </Td> <Td> 17.0 (62.6) </Td> </Tr> <Tr> <Th> Daily mean ° C (° F) </Th> <Td> − 2.4 (27.7) </Td> <Td> 0.4 (32.7) </Td> <Td> 5.7 (42.3) </Td> <Td> 12.5 (54.5) </Td> <Td> 17.8 (64) </Td> <Td> 22.2 (72) </Td> <Td> 24.9 (76.8) </Td> <Td> 25.7 (78.3) </Td> <Td> 21.2 (70.2) </Td> <Td> 14.8 (58.6) </Td> <Td> 7.2 (45) </Td> <Td> 0.4 (32.7) </Td> <Td> 12.5 (54.5) </Td> </Tr> <Tr> <Th> Average low ° C (° F) </Th> <Td> − 5.9 (21.4) </Td> <Td> − 3.4 (25.9) </Td> <Td> 1.6 (34.9) </Td> <Td> 7.8 (46) </Td> <Td> 13.2 (55.8) </Td> <Td> 18.2 (64.8) </Td> <Td> 21.9 (71.4) </Td> <Td> 22.4 (72.3) </Td> <Td> 17.2 (63) </Td> <Td> 10.3 (50.5) </Td> <Td> 3.2 (37.8) </Td> <Td> − 3.2 (26.2) </Td> <Td> 8.6 (47.5) </Td> </Tr> <Tr> <Th> Record low ° C (° F) </Th> <Td> − 22.5 (− 8.5) </Td> <Td> − 19.6 (− 3.3) </Td> <Td> − 14.1 (6.6) </Td> <Td> − 4.3 (24.3) </Td> <Td> 2.4 (36.3) </Td> <Td> 8.8 (47.8) </Td> <Td> 12.9 (55.2) </Td> <Td> 13.5 (56.3) </Td> <Td> 3.2 (37.8) </Td> <Td> − 5.1 (22.8) </Td> <Td> − 11.9 (10.6) </Td> <Td> − 23.1 (− 9.6) </Td> <Td> − 23.1 (− 9.6) </Td> </Tr>

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