<P> Monthly mean temperatures range from 71.2 ° F (21.8 ° C) in February to 76.4 ° F (24.7 ° C) in August . The highest recorded temperature was 94 ° F (34 ° C) on May 20, 1996, and the lowest 53 ° F (12 ° C) on February 21, 1962 . The wettest year was 1994 with 182.81 inches (4,643.4 mm) and the driest year was 1983 with 68.09 inches (1,729.5 mm). The most rainfall in one month was 50.82 inches (1,290.8 mm) in December 1954 . The most rainfall in 24 hours was 27.24 inches (691.9 mm) on November 2, 2000 . </P> <P> Hilo's location on the shore of the funnel - shaped Hilo Bay also makes it vulnerable to tsunamis . </P> <Table> <Tr> <Th_colspan="14"> (hide) Climate data for Hilo International Airport, Hawaii (1981--2010 normals, extremes 1949--present) </Th> </Tr> <Tr> <Th> Month </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> <Th> Year </Th> </Tr> <Tr> <Th> Record high ° F (° C) </Th> <Td> 92 (33) </Td> <Td> 92 (33) </Td> <Td> 93 (34) </Td> <Td> 89 (32) </Td> <Td> 94 (34) </Td> <Td> 90 (32) </Td> <Td> 91 (33) </Td> <Td> 93 (34) </Td> <Td> 93 (34) </Td> <Td> 91 (33) </Td> <Td> 94 (34) </Td> <Td> 93 (34) </Td> <Td> 94 (34) </Td> </Tr> <Tr> <Th> Mean maximum ° F (° C) </Th> <Td> 84.9 (29.4) </Td> <Td> 84.8 (29.3) </Td> <Td> 84.4 (29.1) </Td> <Td> 83.3 (28.5) </Td> <Td> 84.6 (29.2) </Td> <Td> 85.6 (29.8) </Td> <Td> 86.3 (30.2) </Td> <Td> 86.9 (30.5) </Td> <Td> 86.8 (30.4) </Td> <Td> 86.9 (30.5) </Td> <Td> 85.6 (29.8) </Td> <Td> 84.2 (29) </Td> <Td> 88.9 (31.6) </Td> </Tr> <Tr> <Th> Average high ° F (° C) </Th> <Td> 79.0 (26.1) </Td> <Td> 78.8 (26) </Td> <Td> 79.0 (26.1) </Td> <Td> 78.9 (26.1) </Td> <Td> 80.6 (27) </Td> <Td> 82.2 (27.9) </Td> <Td> 82.8 (28.2) </Td> <Td> 83.2 (28.4) </Td> <Td> 83.3 (28.5) </Td> <Td> 82.6 (28.1) </Td> <Td> 80.8 (27.1) </Td> <Td> 79.4 (26.3) </Td> <Td> 80.9 (27.2) </Td> </Tr> <Tr> <Th> Daily mean ° F (° C) </Th> <Td> 71.4 (21.9) </Td> <Td> 71.2 (21.8) </Td> <Td> 71.8 (22.1) </Td> <Td> 72.2 (22.3) </Td> <Td> 73.7 (23.2) </Td> <Td> 75.2 (24) </Td> <Td> 76.1 (24.5) </Td> <Td> 76.4 (24.7) </Td> <Td> 76.2 (24.6) </Td> <Td> 75.6 (24.2) </Td> <Td> 74.1 (23.4) </Td> <Td> 72.3 (22.4) </Td> <Td> 73.85 (23.26) </Td> </Tr> <Tr> <Th> Average low ° F (° C) </Th> <Td> 63.8 (17.7) </Td> <Td> 63.5 (17.5) </Td> <Td> 64.6 (18.1) </Td> <Td> 65.5 (18.6) </Td> <Td> 66.9 (19.4) </Td> <Td> 68.2 (20.1) </Td> <Td> 69.2 (20.7) </Td> <Td> 69.3 (20.7) </Td> <Td> 69.7 (20.9) </Td> <Td> 69.1 (20.6) </Td> <Td> 67.3 (19.6) </Td> <Td> 65.1 (18.4) </Td> <Td> 66.8 (19.3) </Td> </Tr> <Tr> <Th> Mean minimum ° F (° C) </Th> <Td> 59.0 (15) </Td> <Td> 58.5 (14.7) </Td> <Td> 60.3 (15.7) </Td> <Td> 62.0 (16.7) </Td> <Td> 63.1 (17.3) </Td> <Td> 65.0 (18.3) </Td> <Td> 65.8 (18.8) </Td> <Td> 66.0 (18.9) </Td> <Td> 65.6 (18.7) </Td> <Td> 64.7 (18.2) </Td> <Td> 63.2 (17.3) </Td> <Td> 60.5 (15.8) </Td> <Td> 57.9 (14.4) </Td> </Tr> <Tr> <Th> Record low ° F (° C) </Th> <Td> 54 (12) </Td> <Td> 53 (12) </Td> <Td> 54 (12) </Td> <Td> 58 (14) </Td> <Td> 59 (15) </Td> <Td> 61 (16) </Td> <Td> 62 (17) </Td> <Td> 63 (17) </Td> <Td> 61 (16) </Td> <Td> 62 (17) </Td> <Td> 58 (14) </Td> <Td> 55 (13) </Td> <Td> 53 (12) </Td> </Tr> <Tr> <Th> Average rainfall inches (mm) </Th> <Td> 9.26 (235.2) </Td> <Td> 9.56 (242.8) </Td> <Td> 13.43 (341.1) </Td> <Td> 11.54 (293.1) </Td> <Td> 8.12 (206.2) </Td> <Td> 7.37 (187.2) </Td> <Td> 10.81 (274.6) </Td> <Td> 9.85 (250.2) </Td> <Td> 9.94 (252.5) </Td> <Td> 9.77 (248.2) </Td> <Td> 15.50 (393.7) </Td> <Td> 11.57 (293.9) </Td> <Td> 126.72 (3,218.7) </Td> </Tr> <Tr> <Th> Average rainy days (≥ 0.01 in) </Th> <Td> 16.3 </Td> <Td> 15.8 </Td> <Td> 21.4 </Td> <Td> 24.9 </Td> <Td> 23.5 </Td> <Td> 25.1 </Td> <Td> 26.8 </Td> <Td> 26.8 </Td> <Td> 24.3 </Td> <Td> 23.6 </Td> <Td> 23.0 </Td> <Td> 20.6 </Td> <Td> 272.1 </Td> </Tr> <Tr> <Th> Average relative humidity (%) </Th> <Td> 76.6 </Td> <Td> 76.0 </Td> <Td> 78.1 </Td> <Td> 80.2 </Td> <Td> 78.9 </Td> <Td> 77.4 </Td> <Td> 79.5 </Td> <Td> 79.5 </Td> <Td> 79.2 </Td> <Td> 80.0 </Td> <Td> 80.3 </Td> <Td> 78.7 </Td> <Td> 78.7 </Td> </Tr> <Tr> <Th> Mean monthly sunshine hours </Th> <Td> 161.0 </Td> <Td> 152.0 </Td> <Td> 152.7 </Td> <Td> 135.9 </Td> <Td> 155.0 </Td> <Td> 176.9 </Td> <Td> 167.2 </Td> <Td> 174.9 </Td> <Td> 161.5 </Td> <Td> 136.3 </Td> <Td> 115.0 </Td> <Td> 129.0 </Td> <Td> 1,817.4 </Td> </Tr> <Tr> <Th> Percent possible sunshine </Th> <Td> 47 </Td> <Td> 47 </Td> <Td> 41 </Td> <Td> 36 </Td> <Td> 38 </Td> <Td> 44 </Td> <Td> 41 </Td> <Td> 44 </Td> <Td> 44 </Td> <Td> 38 </Td> <Td> 34 </Td> <Td> 38 </Td> <Td> 41 </Td> </Tr> <Tr> <Td_colspan="14"> Source: NOAA (relative humidity and sun 1961 − 1990) </Td> </Tr> </Table> <Tr> <Th_colspan="14"> (hide) Climate data for Hilo International Airport, Hawaii (1981--2010 normals, extremes 1949--present) </Th> </Tr>

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