HILO, HAWAII
NORMALS, MEANS, AND EXTREMES

LATITUDE: 19 Deg. 43 Min. N LONGITUDE: 155 Deg. 04 Min. W ELEVATION: FT. GRND 27 BARO 34 TIME ZONE:BERING WBAN: 21504

(a)
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
YEAR
TEMPERATURE (Deg. F)
Normals
-Daily Maximum
-Daily Minimum
-Monthly
Extremes
-Record Highest
-Year
-Record Lowest
-Year






49

49



79.8
63.6
71.7

91
1979
54
1995


79.8
63.6
71.7

92
1968
53
1962


79.5
64.4
72.0

93
1972
54
1983


79.8
65.5
72.7

89
1978
56
1949


81.2
66.5
73.9

94
1966
58
1947


82.7
67.6
75.2

90
1969
60
1946


83.0
68.6
75.8

89
1995
62
1970


83.6
68.9
76.3

93
1950
63
1955


83.8
68.6
76.2

92
1951
61
1970


83.2
68.1
75.7

91
1979
62
1985


81.4
66.8
74.2

90
1985
58
1985


80.0
64.8
72.4

93
1980
55
1977


81.5
66.4
74.0

94
MAY 1966
53
FEB 1962
NORMAL DEGREE DAYS
Heating (base 65 Deg. F)
Cooling (base 65 Deg. F)




0
208

0
188

0
217

0
231

0
276

0
306

0
335

0
350

0
336

0
332

0
276

0
229

0
3284
% OF POSSIBLE SUNSHINE
45
47
46
42
35
36
43
41
41
43
38
33
37
40
MEAN SKY COVER(tenths)
Sunrise - Sunset
MEAN NUMBER OF DAYS:
Sunrise to Sunset
-Clear
-Partly Cloudy
-Cloudy
Precipitation
.01 inches or more
Snow, Ice Pellets, Hail
1.0 inches or more
Thunderstorms
Heavy Fog Visibility
1/4 mile or less
Temperature Deg. F
-Maximum
90 Deg. F and above
32 Deg. F and below
-Minimum
32 Deg. F and below
0 Deg. F and below

49


49
49
49

53

53
50

50


50
50

50
50

6.3


6.4
11.4
13.2

17.2

0.0
0.9

0.0


0.1
0.0

0.0
0.0

6.6


5.2
10.3
12.8

16.9

0.0
1.3

0.0


0.1
0.0

0.0
0.0

7.5


2.8
10.2
18.0

23.2

0.0
1.5

0.0


0.*
0.0

0.0
0.0

8.0


1.0
8.9
20.0

25.2

0.0
1.0

0.0


0.0
0.0

0.0
0.0

7.8


1.2
10.7
19.1

25.2

0.0
0.6

0.0


0.*
0.0

0.0
0.0

7.5


1.6
11.2
17.2

24.6

0.0
0.1

0.0


0.*
0.0

0.0
0.0

7.6


1.3
11.6
18.1

27.5

0.0
0.3

0.0


0.0
0.0

0.0
0.0

7.4


1.8
12.2
17.0

26.5

0.0
0.3

0.0


0.1
0.0

0.0
0.0

7.0


3.0
12.1
14.9

23.3

0.0
0.5

0.0


0.2
0.0

0.0
0.0

7.2


2.7
11.8
16.5

23.8

0.0
1.1

0.0


0.2
0.0

0.0
0.0

7.3


3.3
10.2
16.5

23.3

0.0
1.2

0.0


0.*
0.0

0.0
0.0

6.8


5.2
10.9
14.9

21.3

0.0
0.9

0.0


0.1
0.0

0.0
0.0

7.2


35.5
131.5
198.2

278.1

0.0
9.8

0.0


0.8
0.0

0.0
0.0
AV. STATION PRES. (mb)
23
1014.5
1014.8
1016.8
1016.7
1016.5
1016.3
1015.6
1015.0
1014.0
1014.3
1014.6
1015.0
1015.3
RELATIVE HUMIDITY (%)
Hour 04
Hour 10 (Local Time)
Hour 16
Hour 22

46
46
46
46

83
79
66
83

84
78
66
82

86
80
67
82

88
81
69
83

88
80
68
82

87
78
65
81

88
81
68
82

88
81
69
83

87
79
68
84

87
80
69
85

87
81
71
86

85
81
69
84

87
80
68
83
PRECIPITATION (in.)
Water Equivalent
-Normal
-Maximum Monthly
-Year
-Minimum Monthly
-Year
-Maximum in 24 hrs
-Year
Snow, Ice Pellets, Hail
-Maximum Monthly
-Year
-Maximum in 24 hrs
-Year



53

53

53




53



9.88
32.24
1979
0.36
1953
10.90
1990

0.0

0.0



10.29
45.55
1979
0.58
1986
22.30
1979

0.0

0.0



13.92
49.93
1980
0.88
1972
17.05
1980

0.0

0.0



15.26
43.24
1986
2.93
1962
11.07
1971

0.0

0.0



9.91
25.01
1964
1.18
1945
10.26
1965

0.0

0.0



6.20
15.50
1943
1.80
1985
4.21
1978

0.0

0.0



9.71
28.59
1982
3.83
1975
7.11
1982

0.0

0.0



9.34
26.92
1991
2.66
1971
11.57
1991

0.0

0.0



8.53
21.82
1994
1.59
1974
9.49
1994

0.0

0.0



9.60
26.10
1951
2.40
1962
8.88
1951

0.0

0.0



14.51
45.75
1990
1.01
1989
15.59
1959

0.0

0.0



12.04
50.82
1954
0.28
1980
11.45
1987

0.0

0.0



129.19
50.82
DEC 1954
0.28
DEC 1980
22.30
FEB 1979





WIND
Mean Speed (mph)
Prevailing Direction
through 1964
Fastest Mile
-Direction(!!)
-Speed(mph)
-Year
Peak Gust
-Direction(!!)
-Speed(mph)
-Date

46



16



12
12


7.4

SW

36
35
1987

NW
47
1992

7.7

SW

35
35
1987

W
55
1986

7.7

SW

35
28
1987

N
40
1993

7.5

WSW

34
26
1987

N
40
1989

7.4

WSW

35
29
1987

N
41
1987

7.1

WSW

11
25
1982

NE
32
1987

6.9

WSW

05
25
1984

SE
36
1986

6.8

WSW

36
25
1993

N
36
1991

6.8

WSW

04
25
1987

SE
37
1992

6.7

SW

34
29
1983

SE
33
1988

6.8

WSW

02
28
1987

S
36
1988

7.2

SW

36
29
1989

NW
45
1989

7.2

WSW

36
35
JAN 1987

W
55
FEB 1986
(a) - Length of Record in Years, although individual months may be missing.
0.* or * - The value is between 0.0 and 0.05.
Normals - Based on the 1961 - 1990 record period.
Extremes - Dates are the most recent occurrence.
Wind Dir.- Numerals show tens of degrees clockwise from true north. "00" indicates calm.
Resultant Directions are given to whole degrees.