Frequencies of Rainfall Deficits

The number of occurrences during the 1955-2007 period of total precipitation that is below the median (i.e., the 50 %ile), below the 40 %ile, below the 30 %ile, below the 20 %ile and below the 10 %ile for a given number of consecutive running 3-month periods. Three consecutive periods would be, for example, Feb-Mar-Apr to Apr-May-Jun of a given year. Results are shown for each number of consecutive periods on an individual basis: i.e., results for 4 consecutive running periods do not include results for 3 periods, even though all instances of 4 periods by definition include two cases of 3 periods, three cases of 2 periods, etc. Similarly, results for a severely dry percentile (such as 10%ile) do not include the results for the milder percentiles (such as 20%ile, 30%ile, etc.). Users wishing to form cumulative tables may form upward-running totals in each percentile column, or rightward-running totals in each frequency row. The reasoning behind choosing individual rather than cumulative occurrences, and the meaning of the results presented here, are described in the text.


                                  HILO   

                                Percentile
Number of
Running               10%    20%    30%    40%    50%
Periods
   1                  18     22     16     16     13
   2                   7     12      7      8     10
   3                   7      7     13     10      5
   4                   2      7      6      4      4
   5                   1      4      9      8      4
   6                   0      2      0      7      4
   7                   0      2      3      1      3
   8                   1      1      2      3      4
   9                   0      0      4      0      1
  10                   0      0      2      2      3
  11                   0      0      0      3      1
  12                   0      0      0      1      0
  13                   0      0      0      1      1
  14                   0      0      0      0      2
  15                   0      0      0      1      2
  16                   0      0      0      0      1
  17                   0      0      0      0      0
  18                   0      0      0      0      0
  19                   0      0      0      0      1
  20                   0      0      0      0      1
  21                   0      0      0      0      0
  22                   0      0      0      0      0
  23                   0      0      0      0      0
  24                   0      0      0      0      0
  25                   0      0      0      0      1
  26                   0      0      0      0      0
  27                   0      0      0      1      0
  28                   0      0      0      0      1

                                  KAHULU 

                                Percentile
Number of
Running               10%    20%    30%    40%    50%
Periods
   1                  21     25     27     24     16
   2                  12     12     11      9      5
   3                   6      7      8      9     12
   4                   2      8      5      5      4
   5                   2      6      6      3      3
   6                   2      0      4      5      4
   7                   0      2      5      5      3
   8                   0      0      1      6      7
   9                   0      2      0      0      0
  10                   0      0      0      1      3
  11                   0      0      3      4      3
  12                   0      0      0      0      3
  13                   0      0      1      0      0
  14                   0      0      0      1      1
  15                   0      0      0      0      1
  16                   0      0      0      1      0
  17                   0      0      0      0      1
  18                   0      0      1      0      0
  19                   0      0      0      0      0
  20                   0      0      0      0      0
  21                   0      0      0      0      0
  22                   0      0      0      0      0
  23                   0      0      0      0      1
  24                   0      0      0      0      0
  25                   0      0      0      1      0
  26                   0      0      0      0      0
  27                   0      0      0      0      0
  28                   0      0      0      0      0
  29                   0      0      0      0      0
  30                   0      0      0      0      0
  31                   0      0      0      0      0
  32                   0      0      0      0      1

                                  HONOLUL

                                Percentile
Number of
Running               10%    20%    30%    40%    50%
Periods
   1                  15     17     31     29     14
   2                   9     15     13     11      8
   3                   3      7      8      9      6
   4                   3      4      6      3      2
   5                   5      5      6      4      4
   6                   1      3      9      5      5
   7                   0      1      0      8      6
   8                   0      4      4      4      4
   9                   0      0      1      2      3
  10                   0      0      1      1      0
  11                   0      0      0      1      1
  12                   0      0      0      1      3
  13                   0      0      0      0      2
  14                   0      0      0      0      0
  15                   0      0      0      1      1
  16                   0      0      0      0      0
  17                   0      0      1      1      2
  18                   0      0      0      0      0
  19                   0      0      0      1      1
  20                   0      0      0      0      0
  21                   0      0      0      0      0
  22                   0      0      0      0      0
  23                   0      0      0      0      1
  24                   0      0      0      0      0
  25                   0      0      0      0      0
  26                   0      0      0      0      0
  27                   0      0      0      0      1

                                  LIHUE  

                                Percentile
Number of
Running               10%    20%    30%    40%    50%
Periods
   1                  18     20     30     17     13
   2                   9     10      8      7      7
   3                   7     12     11      9      7
   4                   2      4      7      9      6
   5                   1      4      6      1      2
   6                   1      1      7      7      3
   7                   0      2      1      4      4
   8                   0      2      1      5      6
   9                   0      0      0      2      3
  10                   0      1      3      2      2
  11                   0      0      1      4      3
  12                   0      0      0      1      3
  13                   0      0      1      0      0
  14                   0      0      0      0      1
  15                   0      0      0      1      2
  16                   0      0      0      0      0
  17                   0      0      0      0      0
  18                   0      0      0      0      0
  19                   0      0      0      0      0
  20                   0      0      0      0      0
  21                   0      0      0      0      0
  22                   0      0      0      0      1
  23                   0      0      0      0      0
  24                   0      0      0      0      0
  25                   0      0      0      0      0
  26                   0      0      0      0      0
  27                   0      0      0      0      0
  28                   0      0      0      0      0
  29                   0      0      0      0      0
  30                   0      0      0      0      0
  31                   0      0      0      0      0
  32                   0      0      0      0      1
  33                   0      0      0      0      0

                                  GUAM WS

                                Percentile
Number of
Running               10%    20%    30%    40%    50%
Periods
   1                  21     22     30     29     27
   2                   5     11     10      7      8
   3                   7      4     11      4      5
   4                   2      6      4      6      5
   5                   2      3      3      6      3
   6                   1      1      2      2      1
   7                   0      1      1      4      1
   8                   0      2      0      2      2
   9                   0      3      2      4      2
  10                   0      0      1      1      1
  11                   0      0      1      1      3
  12                   0      0      2      0      2
  13                   0      0      0      1      1
  14                   0      0      0      1      1
  15                   0      0      0      0      0
  16                   0      0      0      0      1
  17                   0      0      1      1      1
  18                   0      0      0      0      1
  19                   0      0      0      0      0
  20                   0      0      1      1      1
  21                   0      0      0      0      0
  22                   0      0      0      1      1
  23                   0      0      0      0      0
  24                   0      0      0      0      0
  25                   0      0      0      0      1
  26                   0      0      0      0      0
  27                   0      0      0      0      1

                                  KOROR  

                                Percentile
Number of
Running               10%    20%    30%    40%    50%
Periods
   1                  13     23     26     26     19
   2                   5      5     13     11     13
   3                   5      7      4     12     10
   4                   6      7      5      6      4
   5                   2      6      5      1      3
   6                   0      0      3      7      3
   7                   0      0      4      4      5
   8                   0      3      3      1      1
   9                   0      0      1      4      5
  10                   0      0      1      2      3
  11                   1      0      0      0      1
  12                   0      0      0      1      0
  13                   0      0      0      1      1
  14                   0      0      1      1      3
  15                   0      0      0      0      2
  16                   0      0      0      0      0
  17                   0      1      1      0      1
  18                   0      0      0      1      1

                                  MAJURO 

                                Percentile
Number of
Running               10%    20%    30%    40%    50%
Periods
   1                  22     27     28     21     17
   2                   4     10      8      8      5
   3                   3      9     10     12      6
   4                   0      4      7      6      6
   5                   5      4      6      8      5
   6                   2      3      4      2      5
   7                   1      1      6      3      7
   8                   0      1      2      3      3
   9                   0      0      0      3      2
  10                   0      1      1      0      0
  11                   0      0      0      0      0
  12                   0      0      1      0      1
  13                   0      0      0      1      2
  14                   0      0      0      0      1
  15                   0      0      0      2      2
  16                   0      0      0      0      1
  17                   0      0      0      1      0
  18                   0      0      0      0      1
  19                   0      0      0      0      0
  20                   0      0      0      0      0
  21                   0      0      0      0      0
  22                   0      0      0      0      0
  23                   0      0      0      0      1
  24                   0      0      0      0      0
  25                   0      0      0      0      0
  26                   0      0      0      1      1

                                  POHNPEI

                                Percentile
Number of
Running               10%    20%    30%    40%    50%
Periods
   1                  24     22     18     25     11
   2                   6      8     13      9      9
   3                   3     18      8      8     14
   4                   2      5     14      6      0
   5                   1      2      6      7      8
   6                   3      2      3      6      6
   7                   0      1      1      2      4
   8                   0      1      1      1      3
   9                   0      0      3      3      2
  10                   0      0      2      3      2
  11                   0      0      0      3      0
  12                   1      1      0      0      2
  13                   0      0      0      1      1
  14                   0      0      1      0      2
  15                   0      0      0      0      0
  16                   0      0      0      0      0
  17                   0      0      0      0      0
  18                   0      0      0      2      1
  19                   0      0      0      0      2
  20                   0      0      0      0      0
  21                   0      0      0      0      0
  22                   0      0      0      0      0
  23                   0      0      0      0      0
  24                   0      0      0      0      0
  25                   0      0      0      0      0
  26                   0      0      0      0      0
  27                   0      0      0      0      0
  28                   0      0      0      0      0
  29                   0      0      0      0      0
  30                   0      0      0      0      0
  31                   0      0      0      0      0
  32                   0      0      0      0      0
  33                   0      0      0      0      0
  34                   0      0      0      0      0
  35                   0      0      0      0      1

                                  YAP    

                                Percentile
Number of
Running               10%    20%    30%    40%    50%
Periods
   1                  14     27     23     16     29
   2                  10      8     15     10      9
   3                   5     12      9     11      4
   4                   3      4      4      7      7
   5                   2      2      5      6      6
   6                   0      2      3      4      3
   7                   0      1      5      1      1
   8                   0      1      0      2      4
   9                   0      0      1      1      2
  10                   0      0      2      1      1
  11                   0      0      1      4      3
  12                   0      1      0      3      3
  13                   0      0      0      1      3
  14                   0      0      0      0      1
  15                   0      0      1      1      0
  16                   0      0      0      0      1
  17                   0      0      0      0      1
  18                   0      0      0      0      0
  19                   0      0      0      0      1

                                  TRUK   

                                Percentile
Number of
Running               10%    20%    30%    40%    50%
Periods
   1                   9     26     13     17     14
   2                   7     10     12     18      8
   3                   3      7      4      4      7
   4                   2      5      7      6      7
   5                   0      4      3      4      6
   6                   0      0      4      5      5
   7                   0      0      2      2      1
   8                   1      1      0      5      3
   9                   2      1      3      1      4
  10                   0      1      1      2      4
  11                   1      0      2      1      2
  12                   0      1      1      2      3
  13                   0      0      1      0      1
  14                   0      0      0      2      1
  15                   0      0      0      0      0
  16                   0      0      0      0      0
  17                   0      0      0      0      1
  18                   0      0      0      0      0
  19                   0      0      1      1      0
  20                   0      0      0      0      0
  21                   0      0      0      0      0
  22                   0      0      0      0      0
  23                   0      0      0      0      0
  24                   0      0      0      0      0
  25                   0      0      0      0      0
  26                   0      0      0      0      0
  27                   0      0      0      0      0
  28                   0      0      0      0      0
  29                   0      0      0      0      0
  30                   0      0      0      0      0
  31                   0      0      0      0      0
  32                   0      0      0      0      0
  33                   0      0      0      0      0
  34                   0      0      0      0      1

                                  PAGO PAGO

                                Percentile
Number of
Running               10%    20%    30%    40%    50%
Periods
   1                  22     21     24     19     15
   2                  10     16     15     10      6
   3                   1      9     10     17      8
   4                   4      4      5      4      9
   5                   1      2      6      7      5
   6                   0      1      1      2      1
   7                   1      1      1      0      3
   8                   0      1      2      1      0
   9                   0      0      1      3      6
  10                   0      0      2      2      4
  11                   0      1      2      1      2
  12                   0      1      2      2      0
  13                   0      0      0      1      1
  14                   0      0      0      0      0
  15                   1      1      0      0      1
  16                   0      0      1      0      0
  17                   0      0      0      0      0
  18                   0      0      0      0      1
  19                   0      0      0      0      1
  20                   0      0      0      0      0
  21                   0      0      0      1      0
  22                   0      0      0      0      0
  23                   0      0      0      0      1
  24                   0      0      0      0      0
  25                   0      0      0      2      1