General Information About Hawaii's Climate - Hawaii News Now - KGMB and KHNL

General Information About Hawaii's Climate

Climate of Hawaii

The outstanding features of Hawaii's climate include mild temperatures throughout the year, moderate humidity, persistence of northeasterly trade winds, significant differences in rainfall within short distances,and infrequent severe storms.

For most of Hawaii, there are only two seasons: summer, between May and October, and winter, between October and April

Latitude

Hawaii is in the tropics, where the length of day and temperature are relatively uniform throughout the year.

Hawaii's longest and shortest days are about 13 1/2 hours and 11 hours, respectively, compared with 14 1/2 and 10 hours for Southern California and 15 1/2 hours and 8 1/2 hours for Maine.

Uniform day lengths result in small seasonal variations in incoming solar radiation and, therefore, temperature. On a clear winter day, level ground in Hawaii receives at least 67% as much solar energy between sunrise and sunset as it does on a clear summer day. By comparison the percentages are only 33 and 20 at latitudes 40 and 50 degrees respectively.

The Surrounding Ocean

The ocean supplies moisture to the air and acts as a giant thermostat, since its own temperature varies little compared with that of large land masses. The seasonal range of sea surface temperatures near Hawaii is only about 6 degrees, from a low of 73 or 74 degrees between late February and March to a high near 80 degrees in late September or early October. The variation from night to day is one or two degrees.

Hawaii is more than 2,000 miles from the nearest continental land mass. Therefore, air that reaches it, regardless of source, spends enough time over the ocean to moderate its initial harsher properties. Arctic air that reaches Hawaii, during the winter, may have a temperature increase by as much as 100 degrees during its passage over the waters of the North Pacific. Hawaii's warmest months are not June and July, but August and September. Its coolest months, are not December and January, but February and March, reflecting the seasonal lag in the ocean's temperature.

Storm Tracks and the Pacific Anticyclone

These tracks, the paths taken by eastward migrating high and low pressure areas, generally are between 35 degrees north and 65 degrees north, the latitudes of changeable weather. To the south, and particularly over the subtropical oceans, we often find an atmospheric eddy that rarely changes its position. Sometimes it is called "nearly stationary"and lasts long enough to be called "semipermanent".

These eddies include the large subtropical high pressure systems or anticyclones. Weather in their vicinity is usually stable. One of these, the Pacific High or anticyclone, is usually northeast of Hawaii. The air from it moves past the islands as northeasterly trade winds. Its persistence directly reflects that of the Pacific High from which it comes.

The storm tracks and the Pacific High follow the seasonal shift of the sun, moving north in summer and south in winter. The high tends to be stronger and more persistent in summer than in winter. Therefore, in winter, the trade winds may be interrupted for days or weeks by the invasion of the fronts or migratory cyclones from the northern latitudes and by Kona storms forming near the islands. Therefore, winter in Hawaii is the season of more frequent clouds and rainstorms, as well as southerly and westerly winds.

Terrain

Hawaii's mountains significantly influence every aspect of its weather and climate. The endless variety of peaks, valleys, ridges, and broad slopes, gives Hawaii a climate that is different from the surrounding ocean, as well as a climatic variety within the islands. These climatic differences would not exist if the islands were flat and the same size.

The mountains obstruct, deflect, and accelerate the flow of air. When warm, moist air rises over windward coasts and slopes, clouds and rainfall are much greater than over the open sea. Leeward areas, where the air descends, tend to be sunny and dry. In places sheltered by terrain, local air movements are significantly different from winds in exposed localities. Since temperature decreases with elevation by about 3 degrees per thousand feet, Hawaii's mountains, which extend from sea level to nearly 14,000 feet, contain a climatic range from the tropic to the sub-Arctic.

The climate of Hawaii can be defined by what it has and by what it does not have. It does not have the extremes of cold winters and summer heat waves and it usually does not have hurricanes and hailstorms. However, Hawaii's tallest peaks do get their share of winter blizzards, ice, and snow. Highest temperatures may reach into the 90s. Thunderstorms, lightning, hail, floods, hurricanes, tornadoes, and droughts are not unknown. However, these phenomena are usually less frequent and less severe than their counterparts in continental regions.

The highest temperature ever recorded in Hawaii was 100 at Pahala (elevation 870 feet) on the Big Island of Hawaii on April 27, 1931. The lowest ever recorded was 12 on Mauna Kea (elevation 13,770 feet), also on the Big Island, on May 17, 1979.

Rainfall

Over the ocean near Hawaii, rainfall averages between 25 and 30 inches a year. The islands receive as much as 15 times that amount in some places and less than one third of it in others. This is caused mainly by orographic or mountain rains, which form within the moist trade wind air as it moves from the sea over the steep and high terrain of the islands. Over the lower islands, the average rainfall distribution resembles closely the topographic contours. Amounts are greatest over upper slopes and crests and least in the leeward lowlands. On the higher mountains, the belt of maximum rainfall lies between 2,000 to 3,000 feet and amounts decrease rapidly with further elevation. As a result, the highest slopes are relatively dry.

Another source of rainfall is the towering cumulus clouds that build up over the mountains and interiors on sunny calm afternoons. Although such convective showers may be intense, they are usually brief and localized.

Hawaii's heaviest rains come from winter storms between October and April. While the effects of terrain on storm rainfall are not as great as on trade wind showers, large differences over small distances do occur, because of topography and location of the rain clouds. Differences vary with each storm.

Frequently, the heaviest storm rains do not occur in areas with the greatest average rainfall. Relatively dry areas may receive, within a day or a few hours, totals exceeding half of their average annual rainfall.

The leeward and other dry areas obtain their rainfall mainly from a few winter storms. Therefore, their rainfall is usually seasonal and, their summers are dry. In the wetter regions, where rainfall comes from both winter storms and trade wind showers, seasonal differences are much smaller.

The opposite extreme, drought is not unknown in Hawaii, although it rarely affects an entire island at one time. Drought may occur when there are either no winter storms or no trade winds. If there are no winter storms, the normally dry leeward areas are hardest hit. A dry winter, followed by a normally dry summer and another dry winter, can have serious effects. The absence of trade winds affects mostly the windward and upland regions, which receive a smaller proportion of their rain from winter storms.

 

The above product is a condensed chapter on Hawaii's climate from the Second Edition (University of Hawaii Press, 1983) of the "Atlas of Hawaii." The author is Saul Price, former Hawaii State Climatologist and the National Weather Service Pacific Region's Staff Meteorologist (retired).

Honolulu Climate Record
This data reflects observations taken during the period 1947 to 1997. It includes max. and min. temperature, as well as precipitation

January
Day Max Year Min Year Precipitation Year
1 85 1987 55 1973 0.82 1961
2 84 1957,1990 57 1979 1.86 1982
3 87 1987 57 1979,1947 3.91 1969
4 85 1987,1996 57 1947 0.80 1968
5 85 1990 60 1947, 1979, 1986, 1988, 1993 0.61 1969
6 87 1996 57 1947,1993 0.72 1982
7 85 1986,1987 56 1971 6.40 1963
8 85 1990 58 1971 3.69 1949,1980
9 85 1996 59 1966 1.84 1950
10 85 1996 58 1970 3.04 1980
11 85 1996 60 1947, 1986, 1993 2.57 1975
12 86 1988, 1996 57 1978, 1993 2.04 1956
13 85 1991 57 1978 0.71 1971
14 86 1996 56 1963 1.04 1990
15 86 1996 58 1985 1.04 1982
16 87 1996 58 1959, 1985 7.34 1949
17 85 1996 58 1983 1.74 1959
18 84 1986, 1991, 1996 57 1963 1.21 1988
19 85 1986,1996 59 1980 4.15 1952
20 87 1986 53 1969 2.64 1982
21 88 1996 57 1969 3.85 1957
22 87 1978,1996 54 1969 4.59 1950
23 85 1954, 1984, 1996 55 1969 4.75 1972
24 85 1981 55 1969 0.91 1948
25 85 1981 56 1969 2.01 1961
26 86 1959 55 1969 0.51 1961
27 84 1978, 1994, 1996 54 1969 3.03 1968
28 84 1978, 1989 56 1975 1.35 1971
29 84 1975, 1995 56 1994 0.43 1997
30 84 1959, 1970, 1995 56 1972,1993 1.22 1975
31 83 1947, 1962, 1984, 1986, 1995 53 1972 0.34 1976

February

Day Max Year Min Year Precipitation Year
1 86 1970 53 1976 1.81 1975
2 84 1962, 1977 53 1976 2.1 1989
3 86 1986 55 1976 2.03 1979
4 86 1977 54 1993 0.96 1957
5 86 1977, 1996 56 1986 0.76 1995
6 86 1996 58 1975, 1981, 1984 2.68 1976
7 87 1996 56 1981 1.92 1949
8 86 1958 58 1948, 1995 2.1 1949
9 86 1996 53 1981 0.38 1979
10 85 1958 59 1948, 1981 0.88 1956
11 88 1984 56 1983 2.48 1989
12 85 1958 53 1983 1.81 1959
13 86 1978 58 1986 1.29 1994
14 86 1978 57 1993 2.85 1994
15 86 1981 56 1993 1.41 1994
16 86 1978 60 1959, 1993 1.31 1962
17 84 1974, 1978, 1981, 1989 56 1986 0.49 1994
18 84 1974,1981 57 1986 0.56 1995
19 85 1997 57 1990 0.95 1979
20 87 1977 58 1990 1.07 1979
21 87 1977 55 1962 1.02 1988
22 85 1977,1984 56 1962 2.8 1955
23 85 1948, 1979, 1981, 1984, 1996 60 1987, 1990 5.52 1955
24 85 1974,1996, 58 1962 1.73 1955
25 85 1974, 1977, 1995, 1996 58 1987, 1991 2.82 1990
26 86 1977 55 1991 1.21 1985
27 85 1977 58 1972, 1987 3.82 1995
28 86 1977 55 1987 4.62 1958
29 84 1960 61 1976 0.09 1952

March
Day Max Year Min Year Precipitation Year
1 85 1977,1997 58 1983, 1987 2.63 1963
2 85 1959,1997 58 1983 1.13 1989
3 86 1977 58 1991 2.14 1996
4 85 1974, 1977, 1986, 1992 59 1979, 1991 1.06 1964
5 86 1968 59 1987 15.32 1958
6 87 1986 59 1987 2.55 1958
7 85 1970,1978,1986 60 1954, 1984 0.36 1960
8 87 1986 58 1955, 1996 0.34 1962
9 88 1986 61 1989 0.46 1948
10 86 1986 59 1974 1.65 1951
11 88 1978 60 1976 4.11 1951
12 86 1961, 1978, 1984, 1986 55 1976 1.52 1974
13 87 1984 55 1976 0.58 1968
14 87 1978 56 1958, 1993 1.00 1962
15 87 1996 58 1993 0.87 1968
16 88 1987 57 1958, 1993 2.41 1969
17 89 1960 55 1955 1.29 1976
18 85 1961, 1979, 1986, 1995 57 1958 1.19 1980
19 86 1966,1995 59 1997 1.19 1991
20 86 1961,1987 60 1981 1.69 1991
21 86 1989 58 1958 1.83 1951
22 85 1983, 1984, 1989, 1993 61 1957, 1996 3.53 1955
23 87 1987 60 1957 2.23 1997
24 86 1983, 1984, 1986, 1989 57 1954 2.58 1994
25 88 1983 56 1955 1.51 1971
26 87 1981, 1984 57 1955 3.65 1951
27 87 1983, 1989 58 1965 0.87 1951
28 87 1988 61 1965, 1969, 1996 1.43 1975
29 86 1988, 1989, 1996 58 1975 0.40 1947
30 86 1961, 1974, 1996 59 1975 1.83 1971
31 87 1974, 1983 62 1979 0., 74 1971

April

Day Max Year Min Year Precipitation Year
1 87 1974 64 1957 0.35 1997
2 87 1983, 1996 65 1948, 1956, 1983, 1985 1.96 1963
3 87 1974 60 1985 2.30 1963
4 87 1996 59 1985 0.70 1963
5 86 1996 61 1966,1973 0.15 1965
6 87 1996 61 1966, 1985 0.28 1965
7 89 1996 57 1985 0.65 1948
8 90 1996 61 1973 0.54 1963
9 88 1996 60 1957, 1983 0.45 1991
10 88 1995 60 1975 0.82 1963
11 87 1996 60 1975 0.61 1967
12 88 1996 63 1992 0.13 1967, 1981
13 88 1990 62 1951 0.58 1963
14 88 1990 63 1975 3.90 1972
15 87 1996 63 1959 1.51 1963
16 88 1988 63 1949, 1959 2.07 1968
17 88 1988 63 1949 0.14 1954
18 89 1996 62 1989 0.46 1977
19 89 1996 62 1954 3.14 1974
20 88 1986,1996 60 1966 1.16 1978
21 89 1996 60 1958 0.48 1950
22 88 1996 56 1958 2.29 1950
23 90 1996 61 1958 0.88 1950
24 89 1996 60 1979 0.60 1971
25 90 1996 64 1974, 1976, 1979 0.96 1962
26 88 1996 60 1979 0.13 1965
27 87 1996 60 1979 0.45 1950
28 91 1996 60 1979 0.21 1950
29 89 1978 62 1995 1.55 1954
30 89 1990 63 1995 0.19 1966

June

Day Max Year Min Year Precipitation Year
1 91 1996 66 1982 0.33 1980
2 91 1996 65 1982 0.03 1956
3 90 1989 66 1982 0.41 1972
4 92 1992 66 1964 0.11 1976
5 90 1987, 1992, 1996, 1997 66 1972 0.23 1978
6 90 1987 65 1955 0.03 1951, 1982
7 89 1979, 1987, 1990, 1992 65 1979 0.03 1952 1963, 1993
8 90 1979,1997 69 1955, 1969, 1977 0.17 1996
9 89 1978, 1985, 1989, 1996, 1997 68 1948, 1957 0.15 1961
10 91 1982 67 1964 0.24 1986
11 92 1996 65 1964 0.25 1972
12 89 1982, 1988, 1989, 1993 67 1969, 1976 0.28 1987
13 89 1989, 1993 67 1969 0.26 1996
14 90 1982, 1996 67 1963, 1971 0.15 1980
15 90 1982 67 1971 2.00 1971
16 89 1986, 1989, 1993, 1997 65 1971 0.39 1971
17 90 1995 68 1959 0.05 1982
18 90 1982, 1995 68 1991 0.02 1979, 1986, 1990, 1991, 1996, 1997
19 91 1987 66 1959 0.25 1974
20 90 1982, 1987 68 1959 0.08 1947
21 90 1979, 1989, 1996 68 1949 0.13 1949
22 90 1979, 1996 67 1975 0.14 1963
23 91 1989 68 1973 0.28 1996
24 90 1989 67 1982 0.05 1997
25 92 1987 66 1949 0.21 1950
26 92 1987 68 1985 0.06 1969
27 90 1981 67 1973, 1985 0.12 1970
28 92 1995 68 1977, 1985 0.68 1978
29 90 1987, 1988, 1995, 1996 68 1951, 1974 0.74 1974
30 90 1988, 1992, 1995 68 1950 2.00 1967

July

Day Max Year Min Year Precipitation Year
1 92 1995 69 1961,1977,1984 0.68 1967
2 90 1995 70 1955 0.39 1958
3 90 1979, 1981, 1986, 1994, 1995 68 1958 0.07 1982
4 91 1991 70 1958, 1968 0.12 1953
5 91 1995 69 1955 0.17 1996
6 91 1985, 1995 66 1990 0.64 1960
7 91 1984, 1995 66 1990 0.27 1967
8 91 1990,1995 69 1990 0.46 1965
9 91 1979, 1987, 1989, 1995, 1996 68 1956 1.48 1992
10 92 1987 68 1956 0.15 1954
11 91 1985 68 1979, 1984 0.24 1970
12 90 1985, 1994, 1995 69 1950, 1979 0.06 1948
13 92 1985 70 1958, 1979 0.61 1970
14 92 1995 69 1950 0.33 1957
15 94 1995 70 1949 0.10 1949
16 91 1979, 1985, 1988, 1994, 1995 67 1981 0.09 1961
17 91 1995 67 1981 0.12 1961
18 91 1985, 1987 69 1981 0.11 1983
19 91 1985, 1988, 1995 69 1981 0.08 1951
20 91 1987, 1991, 1995, 1997 67 1974 2.18 1989
21 91 1979, 1986 69 1958 0.26 1993
22 91 1986, 1988 67 1953 0.36 1997
23 92 1986, 1987 66 1955 0.32 1964
24 92 1987, 1992 69 1959 0.66 1986
25 92 1987 70 1988 0.72 1986
26 91 1987, 1995 70 1956 0.31 1970
27 91 1984, 1987, 1995 70 1955 0.74 1963
28 92 1987 70 1954 0.46 1965
29 92 1987, 1997 70 1958,1965,1974 0.96 1954
30 92 1990 71 1948, 1954, 1965, 1972, 1976 0.11 1970
31 92 1997 69 1963 0.17 1985

August
,
Day Max Year Min Year Precipitation Year
1 91 1995 70 1966, 1972, 1976, 1980 0.13 1958
2 91 1985, 1994, 1995 69 1959 0.42 1958
3 91 1984, 1987, 1988, 1991, 1994, 1995 70 1948 0.09 1988
4 93 1995 68 1972 0.96 1948
5 92 1986 70 1972 0.48 1959
6 91 1986,1994 70 1959, 1979 2.10 1959
7 92 1984,1987 68 1979 0.88 1958
8 91 1963, 1969, 1983, 1986, 1987, 1994, 1995 70 1979 1.47 1958
9 93 1987 67 1984 1.18 1967
10 92 1987,1994 69 1957 0.17 1993
11 92 1985,1987,1989 70 1957, 1973, 1975, 1977, 1980 0.11 1988
12 92 1994 70 19970.09 1971
13 93 1994 69 1997 0.10 1962
14 93 1997 69 1955 0.09 1957
15 91 1974, 1984, 1985, 1986, 1987, 1989, 1991, 1994, 1997 67 1965 1.20 1982
16 92 1984, 1986, 1994 68 1974 0.54 1965, 1992
17 91 1987, 1994, 1996 70 1955 0.28 1951
18 93 1995 69 1985 0.11 1955
19 93 1994, 1995 68 1955 0.61 1986
20 93 1986 69 1950 0.09 1972
21 93 1987 70 1965, 1983, 1984 0.27 1978
22 93 1995 69 1974 0.07 1965
23 92 1983, 1991, 1995, 1996 70 1972 0.10 1995
24 93 1996 70 1965, 1985, 1988 0.46 1966
25 93 1987, 1996 70 1965, 1981 0.22 1982
26 93 1996 67 1974 0.27 1947
27 92 1986, 1996 68 1971, 1974 0.07 1950
28 92 1986 69 1979 0.16 1960
29 92 1979, 1984, 1987, 1990, 1997 68 1974 0.14 1961
30 93 1997 68 1987 0.28 1951, 1956
31 93 1984 69 1987 1.71 1996

September

Day Max Year Min Year Precipitation Year
1 93 1984 68 1975 0.77 1972
2 94 1997 69 1993 0.75 1974
3 92 1984, 1986, 1990, 1994, 1997 69 1993 0.18 1992
4 94 1986 69 1955 2.07 1947
5 94 1987 69 1955 0.86 1959
6 94 1988 68 1982 0.28 1958
7 94 1986 68 1965, 1985 0.24 1968
8 92 1995 68 1955 0.22 1962
9 91 1983, 1984, 1987 1992, 1995 68 1955 0.66 1974
10 92 1986,1987, 1992, 1995 68 1985 0.17 1950
11 92 1979,1984 68 1985 1.08 1992
12 91 1979, 1983, 1986 1989, 1997 66 1985 0.36 1947
13 92 1997 68 1973, 1985 0.87 1986
14 93 1985 68 1971, 1975 0.26 1997
15 93 1985 69 1957 0.19 1992
16 93 1985 67 1957 0.27 1992
17 92 1987, 1995 70 1950, 1971, 1974 1.35 1963
18 92 1985, 1995 68 1979 0.19 1951
19 95 1994 69 1955 0.03 1951, 1958, 1968,1995
20 92 1986, 1987, 1995 68 1955 0.69 1968
21 92 1990, 1995 67 1975 0.57 1969
22 93 1995 66 1975 0.37 1964
23 93 1995 67 1950 0.78 1985
24 93;92 1966, 1991, 1995 68 1955 0.68 1983
25 93 1966, 1991 69 1955, 1971 0.14 1983
26 92 1995 70 1961, 1970 0.40 1961
27 93 1987 68 1996 0.22 1986
28 91 1987, 1988, 1995, 1997 69 1950, 1975, 1977 0.60 1948
29 93 1993 66 1975 0.46 1960
30 92 1988 67 1981 0.18 1990

October

Day Max Year Min Year Precipitation Year
1 92 1986, 1988 69 1954, 1970, 1992 1.06 1968
2 91 1980, 1986, 1991, 1995 68 1952, 1992 0.69 1970
3 91 1984, 1987, 1988, 1990, 1995 68 1952 5.56 1989
4 92 1995 67 1949 0.81 1989
5 91 1973, 1985, 1995 68 1976 0.18 1976
6 94 1984 67 1980 0.37 1946
7 92 1984 69 1965,1971, 1976, 1989 0.25 1995
8 92 1994 66 1966 0.39 1979
9 91 1984, 1987, 1996 68 1992 0.91 1989
10 92 1987 68 1956 0.81 1966
11 93 1979 66 1965 1.13 1966
12 91 1979, 1987, 1994 65 1955 1.70 1992
13 91 1979, 1994, 1995 65 1962 1.38 1965
14 90 1977, 1979, 1983, 1985, 1986, 1988, 1995 67 1962, 1987 1.06 1956
15 92 1995 68 1962, 1985 1.18 1989
16 92 1995 67 1961 2.12 1991
17 91 1983, 1995 66 1978 0.54 1978
18 91 1986 66 1971 0.68 1973
19 91 1990, 1996 66 1955, 1971 1.34 1985
20 90 1995 64 1981 3.09 1985
21 90 1977, 1983, 1988, 1995, 1996 64 1955 0.68 1969
22 90 1976, 1977, 1994 67 1955, 1975 0.38 1958
23 89 1974, 1976, 1988, 1995 66 1965 1.28 1958
24 90 1995 65 1965 0.73 1958
25 90 1957, 1994 64 1962 0.80 1993
26 90 1984, 1995 64 1962, 1993 0.43 1982
27 89 1980, 1987, 1995 61 1993 2.97 1982
28 91 1996 64 1971 1.60 1982
29 89 1961, 1988 66 1949, 1982 1.30 1984
30 89 1994 66 1959, 1978, 1982 7.47 1978
31 89 1977, 1991 64 1975 2.64 1978

November

,
Day Max Year Min Year Precipitation Year
1 91 1995 64 1962 0.59 1973
2 90 1990 65 1955, 1976, 1989 1.22 1978
3 90 1986 65 1955, 1992 0.57 1995
4 89 1986, 1990 61 1992 1.77 1966
5 89 1991 63 1970, 1978 4.51 1996
6 93 1986 65 1960, 1973, 1978 1.86 1966
7 89 1988,1990 64 1978 1.71 1948
8 89 1977,1990,1995 65 1948 1.33 1996
9 91 1986 64 1979 1.03 1955
10 89 1977, 1983, 1986, 1987, 1995 63 1948 2.34 1965
11 89 1987,1995 63 1993 1.99 1986
12 90 87 64 1976, 1993 4.21 1965
13 90 1983 65 1950 1.08 1996
14 88 1959, 1983, 1991, 1994 62 1974 4.32 1965
15 90 1995 60 1974, 1981 2.22 1996
16 88 1983, 1988, 1995 62 74 3.17 1956
17 90 1995 61 1964 1.34 1990
18 90 1995 63 1974, 1978 0.46 1985
19 90 1995 65 1949 0.30 1952
20 87 1980,1983,1986,1988,1991 63 1949 0.73 1965
21 88 1980,1983,199162 1949 1.78 1957
22 88 1959,1979,1983 63 1949 0.20 1964
23 87 1979,1983 62 1976 0.80 1967
24 87 1983,1987 59 1958, 1990 1.36 1975
25 87 1983 57 1990 5.01 1975
26 88 1980 59 1958 3.44 1975
27 87 1983,1988 58 1972 1.53 1975
28 87 1983,91 60 1972 5.39 1954
29 88 1983,1990 59 1985 3.81 1954
30 89 1983 61 1972 1.63 1968

December

Day Max Year Min Year Precipitation Year
1 89 1979 58 1972 0.91 1968,1973
2 87 1983,1995 59 1955 0.23 1973
3 87 1983,1995 61 1980 3.76 1950
4 88 1983 59 1962 1.41 1978
5 88 1983 61 1955,1972 1.17 1980
6 88 1983 59 1986 4.11 1988
7 88 1983,1989,1995 57 1982 0.25 1996
8 89 1983 56 1982 0.84 1968
9 89 1995 56 1975 2.01 1967
10 88 1983,1995 57 1972 0.92 1951
11 88 1995 55 1972 1.25 1958
12 89 1995 57 1972 7.89 1987
13 89 1977 58 1972 0.36 1978
14 89 1995 60 1947 6.40 1965
15 89 1995 58 1989 1.06 1988
16 88 1995 56 1989 1.15 1968
17 88 1992 57 1980,1989 1.47 1971
18 88 1995 57 1954, 1988, 1989 3.77 1967
19 88 1995 58 1972 5.28 1955
20 87 1979,1995 54 1962 5.37 1955
21 87 1995 58 1962 1.78 1957
22 87 1995 57 1962,1983 1.35 1980
23 86 1995 55 1983 1.78 1982
24 87 1995 59 1978 1.60 1984
25 86 1995 59 1978 2.88 1984
26 86 1995 59 1968,1985 2.09 1992
27 86 1989 59 1978 0.82 1966
28 85 1980,1989,1995 56 1996 0.45 1954
29 85 1995 57 1953 2.21 1958
30 84 1972,1986,1995 57 1990 2.66 1992
31 85 1986 56 1958 2.50 1951
             
This data reflects observations taken during the period 1947 to 1997.