2001 HILO, HAWAII (ITO)

The city of Hilo is located near the midpoint of the eastern shore of the Island of Hawaii. This island is by far the largest of the Hawaiian group, with an area of 4,038 square miles, more than twice that of all the other islands combined. Its topography is dominated by the great volcanic masses of Mauna Loa (13,653 feet), Mauna Kea (13,796 feet), and of Haulalai, the Kohala Mountains, and Kilauea. In fact, the island consists entirely of the slopes of these mountains and of the broad saddles between them. Mauna Loa and Kilauea, which occupy the southern half of the island, are still active volcanoes.

Hawaii lies well within the belt of northeasterly trade winds generated by the semi–permanent Pacific high pressure cell to the north and east. The climate provides equable temperatures from day to day and season to season. In Hilo, July and August are the warmest months, with average daily highs and lows of 83 and 68 degrees. January and February, the coolest months, have highs of 80 degrees and lows of 63 degrees. Greater variations occur in localities with less rain and cloud, but temperatures in the mid–90s and low 50s are uncommon anywhere on the island near sea level.

Over the windward slopes of Hawaii, rainfall occurs principally as orographic showers within the ascending moist trade winds. Mean annual rainfall, except for the semi–sheltered Hamakua district, increases from 100 inches or more along the coasts to a maximum of over 300 inches at elevations of 2,000 to 3,000 feet, and then declines to about 15 inches at the summits of Mauna Kea and Mauna Loa. Leeward areas are topographically sheltered from the trades and are therefore drier, although sea breezes created by daytime heating of the land move onshore and upslope, causing afternoon and evening cloudiness and showers. The driest locality on the island, and in the State, with an annual rainfall of less than 10 inches, is the coastal strip just leeward of the southern portion of the Kohala Mountains and of the saddle between the Kohalas and Mauna Kea.

Within the city of Hilo, average rainfall varies from about 130 inches a year near the shore to as much as 200 upslope. The wettest part of the island, with a mean annual rainfall exceeding 300 inches, lies about 6 miles upslope from the city limits. Relative humidity at Hilo is in the moderate range, however, due to the natural ventilation provided by the prevailing winds, the weather is seldom oppressive.

The trade winds prevail throughout the year and profoundly influence the climate. The islands entire western coast is sheltered from the trades by high mountains, except that unusually strong trade winds may sweep through the saddle between the Kohala Mountains and Mauna Kea and reach the areas to the lee. But even places exposed to the trades may be affected by local mountain circulations. Except for heavy rain, really severe weather seldom occurs. During the winter, cold fronts or the cyclonic storms of subtropical origin may bring blizzards to the upper slopes of Mauna Loa and Mauna Kea, with snow extending at times to 9,000 feet or below and icing nearer the summit.

Storms crossing the Pacific a thousand miles to the north, low pressure or tropical storms, may generate seas that cause heavy swell and surf.

NORMALS, MEANS, AND EXTREMES

HILO, HI (ITO)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 21504

19 43′ 24″ N  155 03′ 05″ W  GRND:  44  BARO: � 0;47  HAWAII  (UTC + 10)

2001 Hilo, Hawaii (ITO)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 79.8 79.8 79.5 79.8 81.2 82.7 83.0 83.6 83.8 83.2 81.4 80.0 81.5
MEAN DAILY MAXIMUM 52 79.4 79.2 79.2 79.7 80.8 82.4 82.8 83.4 83.6 83.0 80.9 79.5 81.2
HIGHEST DAILY MAXIMUM 55 92 92 93 89 94 90 89 93 92 91 92 93 94
YEAR OF OCCURRENCE 1997 1968 1972 1978 1966 1969 1995 1950 1951 1979 1996 1980 MAY 1966
MEAN OF EXTREME MAXS. 52 85.5 85.1 84.4 83.7 84.6 85.5 85.9 86.8 86.8 87.2 85.5 84.5 85.5
NORMAL DAILY MINIMUM 30 63.6 63.6 64.4 65.5 66.5 67.6 68.6 68.9 68.6 68.1 66.8 64.8 66.4
MEAN DAILY MINIMUM 52 63.5 63.3 64.2 65.3 66.4 67.6 68.6 69.0 68.5 67.9 66.7 64.6 66.3
LOWEST DAILY MINIMUM 55 54 53 54 56 58 60 62 63 61 62 58 55 53
YEAR OF OCCURRENCE 1995 1962 1983 1949 1947 1946 1970 1955 1970 1999 1985 1977 FEB 1962
MEAN OF EXTREME MINS. 52 58.6 58.0 59.6 61.6 62.6 64.3 65.0 65.3 64.9 64.1 62.4 59.5 62.2
NORMAL DRY BULB 30 71.7 71.7 72.0 72.7 73.9 75.2 75.8 76.3 76.2 75.7 74.2 72.4 74.0
MEAN DRY BULB 52 71.4 71.3 71.7 72.4 73.7 75.0 75.7 76.2 76.1 75.4 73.8 72.1 73.7
MEAN WET BULB 17 66.0 65.7 66.6 67.5 68.7 70.0 71.2 71.8 71.4 70.8 69.8 67.2 68.9
MEAN DEW POINT 17 63.1 62.6 63.5 64.8 66.1 67.5 68.9 69.5 69.1 68.5 67.7 64.7 66.3
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.1 0.1 * 0.0 0.1 * 0.0 0.1 0.2 0.3 * 0.1 1.0
MAXIMUM 32 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
MINIMUM 32 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
MINIMUM 0 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
H/C NORMAL HEATING DEG. DAYS 30 0 0 0 0 0 0 0 0 0 0 0 0 0
NORMAL COOLING DEG. DAYS 30 208 188 217 231 276 306 335 350 336 332 276 229 3284
RH NORMAL (PERCENT) 30 77 76 78 80 79 77 80 80 79 80 80 79 79
HOUR 02 LST 30 83 83 85 88 87 86 88 87 87 87 86 85 86
HOUR 08 LST 30 78 77 80 81 79 78 81 80 79 79 81 80 79
HOUR 14 LST 30 66 65 67 70 67 65 68 68 69 70 70 68 68
HOUR 20 LST 30 82 81 82 83 82 81 82 82 84 85 85 84 83
S PERCENT POSSIBLE SUNSHINE 49 46 46 42 37 37 44 41 41 43 38 33 37 40
W/O MEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI) 56 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.1
THUNDERSTORMS 56 0.9 1.3 1.5 1.0 0.6 0.1 0.3 0.3 0.5 1.1 1.2 0.9 9.7
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 51 5.0 5.3 6.0 6.4 6.2 5.9 6.1 5.9 5.6 5.7 5.9 5.5 5.8
MIDNIGHT-MIDNIGHT (OKTAS) 33 5.0 5.2 5.9 6.4 6.2 6.1 6.3 5.9 5.6 5.8 6.0 5.5 5.8
MEAN NO. DAYS WITH:
CLEAR 51 6.5 5.3 2.7 1.2 1.2 1.7 1.3 1.8 2.9 2.7 3.2 5.0 35.5
PARTLY CLOUDY 51 11.4 10.3 10.2 9.2 10.6 11.3 11.5 12.2 12.0 11.8 10.0 10.8 131.3
CLOUDY 51 13.1 12.7 18.0 19.7 19.1 17.1 17.7 16.5 14.5 16.1 16.2 14.6 195.3
PR MEAN STATION PRESSURE (IN) 29 29.96 29.98 30.02 30.02 30.02 30.01 29.99 29.97 29.94 29.95 29.96 29.97 29.98
MEAN SEA-LEVEL PRES. (IN) 18 30.02 30.03 30.05 30.07 30.05 30.05 30.02 30.00 29.97 29.98 30.00 30.02 30.02
WINDS MEAN SPEED (MPH) 35 7.6 7.9 8.0 7.8 7.6 7.3 7.2 7.2 7.1 7.0 7.0 7.3 7.4
PREVAIL. DIR (TENS OF DEGS) 22 22 22 22 22 22 23 23 23 22 22 22 22 22
MAXIMUM 2-MINUTE:
SPEED (MPH) 4 29 31 26 23 23 24 21 24 22 24 24 25 31
DIR. (TENS OF DEGS) 01 35 08 08 08 06 07 10 08 02 04 07 35
YEAR OF OCCURRENCE 1998 1998 2001 2001 1999 2001 2000 1998 1998 2001 1999 2001 FEB 1998
MAXIMUM 5-SECOND:
SPEED (MPH) 4 35 38 29 32 29 28 25 32 25 31 29 32 38
DIR. (TENS OF DEGS) 36 34 08 08 11 06 08 10 08 03 04 08 34
YEAR OF OCCURRENCE 1998 1998 2001 2001 1999 2001 1998 1998 1998 2001 1999 2001 FEB 1998
PRECIPITATION NORMAL (IN) 30 9.88 10.29 13.92 15.26 9.91 6.20 9.71 9.34 8.53 9.60 14.51 12.04 129.19
MAXIMUM MONTHLY (IN) 59 32.24 45.55 49.93 43.24 25.01 22.70 28.59 26.92 21.82 26.10 45.90 50.82 50.82
YEAR OF OCCURRENCE 1979 1979 1980 1986 1964 1997 1982 1991 1994 1951 2000 1954 DEC 1954
MINIMUM MONTHLY (IN) 59 0.13 0.52 0.88 2.93 1.18 1.80 3.54 2.66 1.59 2.40 1.01 0.28 0.13
YEAR OF OCCURRENCE 1998 2000 1972 1962 1945 1985 1999 1971 1974 1962 1989 1980 JAN 1998
MAXIMUM IN 24 HOURS (IN) 59 10.90 22.30 17.05 11.07 10.26 4.72 7.11 11.57 9.49 8.88 27.36 11.45 27.36
YEAR OF OCCURRENCE 1990 1979 1980 1971 1965 1997 1982 1991 1994 1951 2000 1987 NOV 2000
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 16.4 16.6 23.1 25.1 25.5 24.3 27.2 25.9 23.4 23.6 22.4 19.8 273.3
PRECIPITATION 1.00 30 2.6 2.6 3.7 3.7 2.2 1.0 1.7 1.4 2.2 2.2 3.9 3.1 30.3
SNOWFALL NORMAL (IN) 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
MAXIMUM MONTHLY (IN) 1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
YEAR OF OCCURRENCE
MAXIMUM IN 24 HOURS (IN) 55 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
YEAR OF OCCURRENCE
MAXIMUM SNOW DEPTH (IN) 47 0 0 0 0 0 0 0 0 0 0 0 0 0
YEAR OF OCCURRENCE
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

2001 Hilo, Hawaii (ITO)

PRECIPITATION (inches) 2001 HILO, HI (ITO)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 10.96 10.13 0.88 17.79 4.71 4.58 9.07 8.77 5.20 9.52 13.23 4.01 98.85
1973 3.45 5.51 18.84 7.34 8.34 3.69 4.40 3.54 8.07 9.72 26.88 8.19 107.97
1974 5.88 7.57 13.47 19.11 8.07 4.76 7.81 4.25 1.59 6.65 14.56 19.20 112.92
1975 19.62 9.28 10.40 10.23 3.01 4.20 3.83 8.13 2.73 8.88 11.15 8.47 99.93
1976 15.62 11.63 25.00 11.58 6.01 2.97 5.46 5.13 5.31 11.35 7.24 7.37 114.67
1977 1.22 9.56 15.49 10.90 10.86 2.46 6.36 7.60 4.19 10.30 8.78 2.66 90.38
1978 5.41 4.26 12.95 6.53 9.64 10.99 11.19 13.53 5.44 10.12 20.21 8.82 119.09
1979 32.24 45.55 5.32 9.90 4.10 10.45 6.54 7.04 3.64 5.03 21.56 7.40 158.77
1980 0.91 4.14 49.93 11.01 5.88 9.66 9.17 8.24 13.70 7.69 7.13 0.28 127.74
1981 1.51 4.95 5.66 4.63 4.16 2.43 4.32 8.97 12.79 10.23 11.73 18.53 89.91
1982 13.58 1.35 48.50 12.00 6.89 6.03 28.59 25.45 9.92 6.53 4.74 6.78 170.36
1983 0.90 0.83 1.98 10.31 9.60 3.94 7.21 7.48 12.08 8.06 2.33 3.37 68.09
1984 10.76 10.06 3.37 12.08 6.59 4.28 6.63 9.36 4.05 2.52 18.38 12.00 100.08
1985 2.25 16.14 21.28 10.61 17.04 1.80 9.86 6.71 11.78 8.19 4.71 2.59 112.96
1986 4.95 0.58 15.37 43.24 8.61 9.11 11.17 10.64 14.36 11.53 35.72 5.75 171.03
1987 9.02 5.06 4.79 9.24 15.65 12.91 18.26 3.69 11.56 14.21 15.83 22.19 142.41
1988 10.31 9.95 13.09 12.90 7.77 5.11 5.50 16.56 11.30 8.50 25.74 13.46 140.19
1989 27.46 6.54 7.33 37.19 19.80 7.03 22.93 8.82 9.73 13.16 1.01 5.71 166.71
1990 29.13 15.24 10.80 4.02 8.13 10.04 10.78 7.80 18.47 20.96 45.75 30.10 211.22
1991 3.81 9.32 37.88 11.02 8.08 9.85 9.82 26.92 9.41 5.15 6.74 15.04 153.04
1992 1.33 1.29 3.90 6.62 2.99 9.36 17.63 13.62 17.59 3.38 25.16 17.02 119.89
1993 2.17 2.67 11.96 9.04 7.54 6.63 18.43 11.38 4.99 12.83 10.74 16.11 114.49
1994 10.39 25.52 18.48 8.59 7.18 13.29 11.71 14.58 21.82 8.73 35.91 6.61 182.81
1995 4.52 1.56 4.17 8.14 8.68 5.35 15.13 13.93 4.20 7.62 8.52 4.10 85.92
1996 14.29 11.81 16.66 6.27 3.65 10.33 13.22 4.77 7.03 11.07 14.22 6.89 120.21
1997 2.33 7.84 19.25 6.03 10.75 22.70 19.38 4.75 8.98 12.64 8.86 8.10 131.61
1998 0.13 2.40 3.67 8.86 15.65 11.27 6.09 8.48 10.76 16.01 15.57 9.89 108.78
1999 16.68 19.34 12.13 16.04 2.84 4.66 3.54 10.14 5.65 3.61 7.74 14.41 116.78
2000 17.87 0.52 5.81 7.25 3.36 8.19 13.16 10.54 9.20 17.65 45.90 4.59 144.04
2001 2.28 12.47 8.35 12.56 2.94 3.64 6.54 7.90 9.01 13.16 19.89 13.77 112.51
POR=59 YRS 9.48 11.18 13.46 12.75 8.84 6.89 10.13 10.15 8.15 10.07 15.38 13.20 129.68

2001 Hilo, Hawaii (ITO)

AVERAGE TEMPERATURE (F) HILO, HI (ITO)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 70.1 70.7 73.8 72.7 73.0 75.3 75.4 76.5 76.4 76.0 73.3 71.4 73.7
1973 72.2 71.1 72.5 72.2 72.9 74.6 75.7 76.3 76.3 75.8 75.4 73.8 74.1
1974 74.5 72.6 73.1 73.5 73.8 75.3 76.1 76.9 77.3 76.9 73.6 72.3 74.7
1975 71.0 71.9 71.2 72.4 73.1 74.4 74.8 75.7 75.5 74.7 73.5 72.2 73.4
1976 71.3 71.2 71.6 72.1 73.0 73.6 74.5 76.2 76.9 76.2 74.5 73.2 73.7
1977 73.9 74.0 73.3 74.2 74.7 76.2 77.1 78.1 77.5 76.9 75.2 73.7 75.4
1978 71.7 72.0 73.2 74.2 76.2 76.5 77.1 76.8 76.2 75.5 74.1 71.1 74.6
1979 69.8 70.4 71.5 73.8 73.8 74.2 74.6 75.6 76.5 76.1 73.0 72.8 73.5
1980 71.6 72.6 72.3 74.5 77.3 77.6 77.8 75.0 75.7 74.8 73.8 74.2 74.8
1981 73.5 72.7 71.6 72.8 74.2 76.0 76.1 76.1 76.2 74.6 73.9 72.0 74.1
1982 71.9 71.8 70.3 71.2 72.9 76.3 76.7 76.9 76.1 74.9 74.6 71.8 73.8
1983 71.4 71.9 72.5 71.9 72.6 74.3 74.8 75.2 74.9 74.1 73.8 72.9 73.4
1984 72.4 71.5 73.8 73.0 74.0 74.7 75.2 75.3 75.4 76.5 73.6 71.1 73.9
1985 69.8 70.5 69.4 69.8 71.4 74.4 75.4 75.7 75.7 74.3 73.0 71.6 72.6
1986 71.1 73.6 74.7 73.6 75.4 76.6 77.8 78.5 77.9 76.4 75.1 72.8 75.3
1987 71.8 70.7 71.6 72.2 72.5 75.4 76.7 77.9 77.8 76.6 74.7 73.1 74.3
1988 71.9 72.3 72.2 72.6 74.2 74.7 75.7 76.0 76.6 77.9 76.3 74.9 74.6
1989 72.2 71.4 72.4 71.1 72.7 74.7 75.2 75.0 74.6 75.6 73.6 71.3 73.3
1990 72.1 70.4 71.2 73.5 74.1 75.0 76.0 77.0 77.2 76.2 75.4 72.5 74.2
1991 72.0 72.8 70.8 72.6 74.2 74.8 76.0 76.9 76.9 76.2 75.8 72.9 74.3
1992 71.2 71.4 72.3 72.4 74.8 76.2 76.2 77.2 77.8 77.7 75.2 73.6 74.7
1993 71.1 70.1 71.6 73.5 73.3 75.4 75.8 77.0 77.1 76.0 73.4 71.7 73.8
1994 70.0 71.3 71.7 73.4 74.9 76.0 78.1 78.6 78.1 77.4 74.9 73.0 74.8
1995 72.6 72.9 74.8 74.1 75.5 76.9 77.9 77.7 78.2 76.2 75.6 74.6 75.6
1996 73.4 70.9 71.5 74.4 76.1 76.9 77.5 77.5 77.5 77.3 75.8 73.2 75.2
1997 73.1 72.7 73.3 74.0 75.0 76.7 77.4 78.0 77.7 76.8 74.3 72.4 75.1
1998 71.8 71.7 72.9 71.8 72.2 73.8 74.8 76.1 74.5 74.2 72.4 69.9 73.0
1999 69.7 69.0 70.5 71.1 72.9 73.4 74.3 74.3 74.0 74.0 72.4 71.3 72.2
2000 69.1 71.3 71.8 71.3 73.9 75.5 75.5 76.1 75.4 75.3 73.0 71.7 73.3
2001 71.6 71.0 71.2 71.5 72.3 73.9 75.4 76.1 76.2 75.1 74.0 72.7 73.4
POR=55 YRS 71.3 71.2 71.5 72.3 73.5 74.9 75.5 76.1 75.9 75.4 73.8 72.0 73.6

REFERENCE NOTES:

PAGE 1:

THE TEMPERATURE GRAPH SHOWS NORMAL MAXIMUM AND NORMAL MINIMUM DAILY TEMPERATURES (SOLID CURVES) AND THE ACTUAL DAILY HIGH AND LOW TEMPERATURES (VERTICAL BARS).

PAGE 2 AND 3:

H/C INDICATES HEATING AND COOLING DEGREE DAYS.

RH INDICATES RELATIVE HUMIDITY

W/O INDICATES WEATHER AND OBSTRUCTIONS

S INDICATES SUNSHINE.

PR INDICATES PRESSURE.

CLOUDINESS ON PAGE 3 IS THE SUM OF THE CEILOMETER AND SATELLITE DATA NOT TO EXCEED EIGHT EIGHTHS (OKTAS).

GENERAL:

T INDICATES TRACE PRECIPITATION, AN AMOUNT GREATER THAN ZERO BUT LESS THAN THE LOWEST REPORTABLE VALUE.

+ INDICATES THE VALUE ALSO OCCURS ON EARLIER DATES.

BLANK ENTRIES DENOTE MISSING OR UNREPORTED DATA.

NORMALS ARE 30–YEAR AVERAGES (1961–1990).

ASOS INDICATES AUTOMATED SURFACE OBSERVING SYSTEM.

PM INDICATES THE LAST DAY OF THE PREVIOUS MONTH.

POR (PERIOD OF RECORD) BEGINS WITH THE JANUARY DATA MONTH AND IS THE NUMBER OF YEARS USED TO COMPUTE THE MEAN. INDIVIDUAL MONTHS WITHIN THE POR MAY BE MISSING.

WHEN THE POR FOR A NORMAL IS LESS THAN 30 YEARS, THE NORMAL IS PROVISIONAL AND IS BASED ON THE NUMBER OF YEARS INDICATED.

0.* OR * INDICATES THE VALUE OR MEAN–DAYS–WITH IS BETWEEN 0.00 AND 0.05.

CLOUDINESS FOR ASOS STATIONS DIFFERS FROM THE NON–ASOS OBSERVATION TAKEN BY A HUMAN OBSERVER. ASOS STATION CLOUDINESS IS BASED ON TIME–AVERAGED CEILOMETER DATA FOR CLOUDS AT OR BELOW 12,000 FEET AND ON SATELLITE DATA FOR CLOUDS ABOVE 12,000 FEET.

THE NUMBER OF DAYS WITH CLEAR, PARTLY CLOUDY, AND CLOUDY CONDITIONS FOR ASOS STATIONS IS THE SUM OF THE CEILOMETER AND SATELLITE DATA FOR THE SUNRISE TO SUNSET PERIOD.

GENERAL CONTINUED:

CLEAR INDICATES 0–2 OKTAS, PARTLY CLOUDY INDICATES 3–6 OKTAS, AND CLOUDY INDICATES 7 OR 8 OKTAS. WHEN AT LEAST ONE OF THE ELEMENTS (CEILOMETER OR SATELLITE) IS MISSING, THE DAILY CLOUDINESS IS NOT COMPUTED.

WIND DIRECTION IS RECORDED IN TENS OF DEGREES (2 DIGITS) CLOCKWISE FROM TRUE NORTH. "00" INDICATES CALM. "36" INDICATES TRUE NORTH.

RESULTANT WIND IS THE VECTOR AVERAGE OF THE SPEED AND DIRECTION.

AVERAGE TEMPERATURE IS THE SUM OF THE MEAN DAILY MAXIMUM AND MINIMUM TEMPERATURE DIVIDED BY 2.

SNOWFALL DATA COMPRISE ALL FORMS OF FROZEN PRECIPITATION, INCLUDING HAIL.

A HEATING (COOLING) DEGREE DAY IS THE DIFFERENCE BETWEEN THE AVERAGE DAILY TEMPERATURE AND 65 F.

DRY BULB IS THE TEMPERATURE OF THE AMBIENT AIR.

DEW POINT IS THE TEMPERATURE TO WHICH THE AIR MUST BE COOLED TO ACHIEVE 100 PERCENT RELATIVE HUMIDITY.

WET BULB IS THE TEMPERATURE THE AIR WOULD HAVE IF THE MOISTURE CONTENT WAS INCREASED TO 100 PERCENT RELATIVE HUMIDITY.

ON JULY 1, 1996, THE NATIONAL WEATHER SERVICE BEGAN USING THE "METAR" OBSERVATION CODE THAT WAS ALREADY EMPLOYED BY MOST OTHER NATIONS OF THE WORLD. THE MOST NOTICEABLE DIFFERENCE IN THIS ANNUAL PUBLICATION WILL BE THE CHANGE IN UNITS FROM TENTHS TO EIGHTS (OKTAS) FOR REPORTING THE AMOUNT OF SKY COVER.

2001 Hilo, Hawaii (ITO)

HEATING DEGREE DAYS (base 65 F) 2001 HILO, HI (ITO)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1983-84 0 0 0 0 0 0 0 0 0 0 0 0 0
1984-85 0 0 0 0 0 0 0 0 0 0 0 0 0
1985-86 0 0 0 0 0 0 0 0 0 0 0 0 0
1986-87 0 0 0 0 0 0 0 0 0 0 0 0 0
1987-88 0 0 0 0 0 0 0 0 0 0 0 0 0
1988-89 0 0 0 0 0 0 0 0 0 0 0 0 0
1989-90 0 0 0 0 0 0 0 0 0 0 0 0 0
1990-91 0 0 0 0 0 0 0 0 0 0 0 0 0
1991-92 0 0 0 0 0 0 0 0 0 0 0 0 0
1992-93 0 0 0 0 0 0 0 0 0 0 0 0 0
1993-94 0 0 0 0 0 0 0 0 0 0 0 0 0
1994-95 0 0 0 0 0 0 0 0 0 0 0 0 0
1995-96 0 0 0 0 0 0 0 0 0 0 0 0 0
1996-97 0 0 0 0 0 0 0 0 0 0 0 0 0
1997-98 0 0 0 0 0 0 0 0 0 0 0 0 0
1998-99 0 0 0 0 0 0 0 0 0 0 0 0 0
1999-00 0 0 0 0 0 0 0 0 0 0 0 0 0
2000-01 0 0 0 0 0 0 0 0 0 0 0 0 0
2001- 0 0 0 0

2001 Hilo, Hawaii (ITO)

COOLING DEGREE DAYS (base 65 F) 2001 HILO, HI (ITO)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 163 171 281 236 256 316 330 365 349 348 256 207 3278
1973 233 180 239 222 253 294 341 358 345 340 321 278 3404
1974 299 219 261 263 276 315 351 375 375 376 262 235 3607
1975 192 201 197 232 257 288 311 339 323 309 262 233 3144
1976 201 186 214 222 255 268 302 355 364 357 291 261 3276
1977 280 260 264 281 307 343 379 415 382 374 312 274 3871
1978 216 215 263 283 353 351 383 375 341 332 279 195 3586
1979 155 160 210 271 278 280 302 338 351 350 246 248 3189
1980 213 227 234 293 390 385 405 316 328 313 269 295 3668
1981 271 220 210 242 293 338 350 348 345 302 274 225 3418
1982 220 196 170 194 252 348 369 379 340 317 293 219 3297
1983 207 200 239 214 240 287 313 324 303 288 272 250 3137
1984 236 194 282 247 284 298 324 326 320 363 261 195 3330
1985 154 161 142 152 204 290 329 339 329 294 248 211 2853
1986 196 246 308 264 329 356 404 423 396 363 309 250 3844
1987 218 163 212 226 241 319 369 407 389 365 299 259 3467
1988 221 216 233 238 293 298 338 349 353 405 345 315 3604
1989 227 188 238 189 248 297 327 315 294 335 264 202 3124
1990 227 157 200 260 290 308 349 379 376 353 317 237 3453
1991 223 222 188 234 296 301 348 378 365 351 333 251 3490
1992 197 192 235 229 312 343 355 384 387 402 315 275 3626
1993 193 148 213 263 263 318 343 380 370 350 260 217 3318
1994 161 183 214 261 312 338 412 427 401 389 305 254 3657
1995 241 228 310 281 335 364 410 402 401 355 325 303 3955
1996 266 178 209 291 349 360 396 394 379 387 331 265 3805
1997 261 221 261 277 317 358 388 407 389 373 287 239 3778
1998 216 194 253 211 230 269 311 351 293 289 228 162 3007
1999 149 117 179 189 252 257 292 296 278 284 228 200 2721
2000 133 191 221 194 280 322 332 350 317 328 247 213 3128
2001 209 174 201 204 234 276 330 350 341 319 278 246 3162

2001 Hilo, Hawaii (ITO)

SNOWFALL (inches) 2001 HILO, HI (ITO)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1973-74 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1974-75 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1975-76 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1976-77 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1977-78 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1978-79 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1979-80 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1980-81 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1981-82 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1982-83 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1983-84 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1984-85 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1985-86 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1986-87 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1987-88 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1988-89 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1989-90 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1990-91 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1991-92 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1992-93 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1993-94 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1994-95 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1995-96 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1996-97 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1997-98 0.0 0.0 0.0 0.0 0.0 0.0
1998-99
1999-00
2000-01
2001-
POR=54 YRS 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

User Contributions:

1
Dheeraj
⚠
If you wrote an article about life we'd all reach enighltenemnt.

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2001 Hilo, Hawaii (ITO) forum