Monthly sea levels for TONGA ---------------------------- Mth Year Gaps Good Minimum Maximum Mean St Devn 1 1993 4800 2640 0.282 1.463 0.897 0.332 2 1993 0 6720 0.134 1.791 0.945 0.395 3 1993 0 7440 0.152 1.794 0.959 0.391 4 1993 0 7200 0.136 1.784 0.951 0.393 5 1993 0 7440 0.129 1.681 0.839 0.396 6 1993 0 7200 0.093 1.601 0.862 0.393 7 1993 0 7440 0.016 1.575 0.848 0.395 8 1993 0 7440 0.074 1.660 0.884 0.392 9 1993 0 7200 0.036 1.695 0.848 0.392 10 1993 0 7440 -0.012 1.667 0.844 0.385 11 1993 960 6240 0.006 1.717 0.888 0.394 12 1993 0 7440 0.179 1.727 0.933 0.390 1 1994 0 7440 0.147 1.656 0.932 0.404 2 1994 0 6720 0.152 1.699 0.926 0.395 3 1994 0 7440 0.089 1.756 0.931 0.403 4 1994 720 6480 -0.030 1.695 0.889 0.403 5 1994 0 7440 0.061 1.708 0.897 0.392 6 1994 0 7200 -0.031 1.579 0.834 0.390 7 1994 0 7440 -0.003 1.499 0.772 0.386 8 1994 0 7440 0.097 1.544 0.834 0.382 9 1994 0 7200 0.081 1.573 0.786 0.388 10 1994 0 7440 0.040 1.697 0.843 0.390 11 1994 0 7200 0.004 1.733 0.930 0.401 12 1994 0 7440 0.191 1.884 1.023 0.401 1 1995 0 7440 0.187 1.813 0.970 0.400 2 1995 0 6720 0.184 1.716 0.920 0.400 3 1995 0 7440 0.119 1.601 0.873 0.398 4 1995 0 7200 0.055 1.674 0.875 0.395 5 1995 0 7440 -0.071 1.630 0.825 0.394 6 1995 0 7200 -0.050 1.663 0.803 0.395 7 1995 0 7440 0.042 1.727 0.874 0.394 8 1995 0 7440 0.077 1.681 0.888 0.399 9 1995 1056 6144 0.166 1.632 0.883 0.415 10 1995 0 7440 0.205 1.746 0.952 0.397 11 1995 2164 5036 0.231 1.582 0.938 0.363 12 1995 1710 5730 -0.026 1.684 0.830 0.412 1 1996 0 7440 0.130 1.863 0.952 0.395 2 1996 0 6960 0.204 1.795 0.980 0.386 3 1996 0 7440 0.254 1.727 0.959 0.377 4 1996 0 7200 0.201 1.605 0.924 0.382 5 1996 0 7440 0.127 1.594 0.841 0.388 6 1996 0 7200 0.002 1.658 0.868 0.397 7 1996 0 7440 0.021 1.747 0.886 0.408 8 1996 0 7440 0.060 1.733 0.886 0.414 9 1996 0 7200 0.173 1.778 0.970 0.409 10 1996 0 7440 0.246 1.769 0.962 0.392 11 1996 0 7200 0.224 1.687 0.977 0.388 12 1996 0 7440 0.137 1.707 0.991 0.387 1 1997 0 7440 0.169 1.805 1.017 0.387 2 1997 0 6720 0.188 1.849 1.071 0.400 3 1997 110 7330 0.375 1.989 1.118 0.396 4 1997 0 7200 0.330 1.860 1.084 0.386 5 1997 0 7440 0.314 1.836 1.050 0.393 6 1997 0 7200 0.256 1.727 1.007 0.393 7 1997 0 7440 0.116 1.672 0.964 0.394 8 1997 0 7440 0.141 1.747 0.929 0.392 9 1997 0 7200 0.083 1.746 0.917 0.394 10 1997 0 7440 0.132 1.776 0.946 0.391 11 1997 0 7200 0.082 1.683 0.897 0.391 12 1997 0 7440 0.206 1.813 1.025 0.397 1 1998 0 7440 0.280 1.850 1.069 0.402 2 1998 0 6720 0.266 1.855 1.001 0.391 3 1998 0 7440 0.259 1.893 1.088 0.402 4 1998 0 7200 0.151 1.808 1.018 0.392 5 1998 0 7440 0.196 1.845 1.001 0.390 6 1998 0 7200 0.227 1.864 1.035 0.385 7 1998 0 7440 0.182 1.607 0.942 0.384 8 1998 0 7440 0.116 1.609 0.887 0.387 9 1998 0 7200 0.069 1.612 0.879 0.390 10 1998 0 7440 0.115 1.796 0.935 0.397 11 1998 0 7200 0.053 1.802 0.944 0.407 12 1998 0 7440 0.077 1.972 0.937 0.415 1 1999 0 7440 0.018 1.667 0.891 0.407 2 1999 0 6720 0.151 1.832 0.950 0.401 3 1999 0 7440 0.152 1.684 0.926 0.401 4 1999 0 7200 0.127 1.783 0.967 0.393 5 1999 0 7440 0.090 1.766 0.945 0.384 6 1999 0 7200 0.017 1.734 0.915 0.391 7 1999 0 7440 0.137 1.776 1.006 0.393 8 1999 0 7440 0.191 1.764 0.953 0.400 9 1999 0 7200 0.133 1.624 0.907 0.399 10 1999 0 7440 0.176 1.797 0.978 0.404 11 1999 0 7200 0.210 1.898 1.044 0.391 12 1999 0 7440 0.221 1.922 1.058 0.393 1 2000 0 7440 0.259 1.983 1.101 0.393 2 2000 0 6960 0.298 1.866 1.092 0.389 3 2000 0 7440 0.403 1.969 1.132 0.380 4 2000 0 7200 0.414 1.932 1.115 0.387 5 2000 0 7440 0.280 1.831 1.052 0.385 6 2000 0 7200 0.150 1.884 1.046 0.394 7 2000 0 7440 0.124 1.918 1.020 0.405 8 2000 0 7440 0.095 1.794 0.968 0.406 9 2000 0 7200 0.184 1.693 0.972 0.387 10 2000 0 7440 0.230 1.636 0.948 0.385 11 2000 0 7200 0.191 1.697 0.983 0.382 12 2000 0 7440 0.241 1.881 1.048 0.378 1 2001 4193 3247 0.103 1.801 1.000 0.391 2 2001 0 6720 0.190 1.880 1.077 0.394 3 2001 0 7440 0.221 1.859 1.052 0.393 4 2001 0 7200 0.243 1.750 0.969 0.391 5 2001 0 7440 0.200 1.652 0.936 0.389 6 2001 0 7200 0.114 1.758 0.955 0.395 7 2001 0 7440 0.064 1.731 0.941 0.391 8 2001 0 7440 0.046 1.804 0.950 0.386 9 2001 0 7200 0.149 1.786 0.979 0.386 10 2001 0 7440 0.223 1.771 0.985 0.375 11 2001 1470 5730 0.353 1.821 1.039 0.390 12 2001 4560 2880 0.402 1.872 1.085 0.330 1 2002 0 7440 0.304 1.923 1.096 0.387 2 2002 0 6720 0.324 1.949 1.102 0.381 3 2002 0 7440 0.356 1.927 1.151 0.394 4 2002 0 7200 0.281 1.840 1.078 0.380 5 2002 0 7440 0.195 1.696 0.998 0.370 6 2002 0 7200 0.263 1.694 0.968 0.369 7 2002 0 7440 0.264 1.694 0.985 0.370 8 2002 0 7440 0.157 1.706 0.957 0.379 9 2002 0 7200 0.178 1.738 0.959 0.379 10 2002 0 7440 0.194 1.888 0.988 0.385 11 2002 0 7200 0.177 1.812 1.041 0.385 12 2002 2178 5262 0.339 1.889 1.088 0.403 1 2003 4809 2631 0.260 1.676 1.005 0.408 2 2003 0 6720 0.269 1.759 1.025 0.379 3 2003 0 7440 0.267 1.766 1.030 0.374 4 2003 0 7200 0.163 1.760 0.990 0.373 5 2003 0 7440 0.150 1.793 0.962 0.368 6 2003 0 7200 0.110 1.709 0.928 0.368 7 2003 0 7440 0.088 1.634 0.886 0.375 8 2003 0 7440 0.193 1.633 0.909 0.382 9 2003 0 7200 0.163 1.661 0.897 0.383 10 2003 0 7440 0.052 1.680 0.887 0.382 11 2003 0 7200 0.098 1.775 0.911 0.380 12 2003 680 6760 0.193 1.825 1.009 0.378 1 2004 1909 5531 0.166 1.728 0.977 0.388 2 2004 0 6960 0.339 1.713 1.034 0.368 3 2004 0 7440 0.401 1.718 1.064 0.360 4 2004 0 7200 0.349 1.786 1.001 0.363 5 2004 0 7440 0.199 1.722 0.965 0.365 6 2004 0 7200 0.124 1.733 0.937 0.381 7 2004 0 7440 0.092 1.737 0.928 0.387 8 2004 0 7440 0.067 1.740 0.912 0.388 9 2004 0 7200 0.222 1.659 0.941 0.376 10 2004 0 7440 0.203 1.693 0.954 0.372 11 2004 0 7200 0.108 1.701 0.964 0.368 12 2004 0 7440 0.156 1.820 1.054 0.364 1 2005 0 7440 0.139 1.820 1.035 0.369 2 2005 0 6720 0.210 1.859 1.063 0.372 3 2005 307 7133 0.209 1.725 0.957 0.362 4 2005 0 7200 0.224 1.697 0.968 0.366 5 2005 0 7440 0.235 1.690 0.966 0.370 6 2005 0 7200 0.063 1.629 0.910 0.376 7 2005 0 7440 0.122 1.764 0.942 0.379 8 2005 0 7440 0.079 1.674 0.867 0.373 9 2005 0 7200 0.099 1.654 0.874 0.372 10 2005 0 7440 0.252 1.741 0.999 0.367 11 2005 0 7200 0.255 1.707 1.003 0.367 12 2005 0 7440 0.196 1.705 0.972 0.373 1 2006 0 7440 0.182 1.866 1.010 0.385 2 2006 0 6720 0.218 1.853 1.030 0.371 3 2006 0 7440 0.227 1.799 1.008 0.389 4 2006 0 7200 0.271 1.801 1.050 0.379 5 2006 0 7440 0.220 1.691 1.015 0.372 6 2006 0 7200 0.256 1.675 0.998 0.372 7 2006 0 7440 0.266 1.768 1.013 0.366 8 2006 0 7440 0.256 1.779 0.987 0.369 9 2006 0 7200 0.158 1.704 0.935 0.368 10 2006 0 7440 0.167 1.784 0.999 0.373 11 2006 0 7200 0.170 1.796 1.043 0.376 12 2006 0 7440 0.255 1.798 1.043 0.377 1 2007 0 7440 0.344 1.810 1.112 0.373 2 2007 0 6720 0.316 1.800 1.096 0.366 3 2007 0 7440 0.301 1.858 1.059 0.369 4 2007 0 7200 0.228 1.839 1.009 0.365 5 2007 0 7440 0.214 1.821 1.039 0.363 6 2007 0 7200 0.201 1.751 0.986 0.367 7 2007 0 7440 0.263 1.738 1.024 0.371 8 2007 0 7440 0.294 1.713 1.021 0.381 9 2007 0 7200 0.212 1.823 1.013 0.382 10 2007 0 7440 0.238 1.918 1.062 0.379 11 2007 0 7200 0.267 1.947 1.117 0.379 12 2007 0 7440 0.251 1.865 1.068 0.368 1 2008 0 7440 0.278 1.776 1.075 0.360 2 2008 0 6960 0.390 1.751 1.064 0.365 3 2008 0 7440 0.379 1.782 1.099 0.357 4 2008 0 7200 0.314 1.848 1.063 0.369 5 2008 0 7440 0.244 1.886 1.036 0.374 6 2008 0 7200 0.190 1.823 1.052 0.382 7 2008 0 7440 0.172 1.806 1.016 0.383 8 2008 0 7440 0.307 1.822 1.069 0.382 9 2008 0 7200 0.419 1.785 1.093 0.367 10 2008 0 7440 0.286 1.802 1.057 0.363 11 2008 0 7200 0.237 1.863 1.064 0.367 12 2008 0 7440 0.297 1.972 1.143 0.369 1 2009 0 7440 0.359 2.053 1.161 0.379 2 2009 0 6720 0.290 1.886 1.090 0.379 3 2009 0 7440 0.386 1.828 1.130 0.376 4 2009 0 7200 0.379 1.889 1.107 0.377 5 2009 0 7440 0.174 1.763 1.038 0.382 6 2009 0 7200 0.079 1.728 0.973 0.384 7 2009 0 7440 0.223 1.879 1.077 0.381 8 2009 0 7440 0.284 1.874 1.063 0.373 9 2009 0 7200 0.342 1.812 1.072 0.370 10 2009 0 7440 0.319 1.748 1.022 0.370 11 2009 0 7200 0.223 1.670 1.016 0.374 12 2009 0 7440 0.232 1.793 1.047 0.381 1 2010 0 7440 0.161 1.942 1.076 0.391 2 2010 0 6720 0.250 2.124 1.074 0.377 3 2010 0 7440 0.281 1.929 1.108 0.386 4 2010 0 7200 0.350 1.846 1.057 0.374 5 2010 0 7440 0.317 1.748 1.030 0.370 6 2010 0 7200 0.179 1.639 0.968 0.367 7 2010 0 7440 0.223 1.791 0.975 0.374 8 2010 0 7440 0.045 1.687 0.936 0.379 9 2010 0 7200 0.216 1.820 0.988 0.383 10 2010 0 7440 0.228 1.810 0.996 0.387 11 2010 0 7200 0.196 1.737 0.960 0.386 12 2010 0 7440 0.218 1.751 1.009 0.389 1 2011 0 7440 0.342 1.865 1.087 0.381 2 2011 0 6720 0.281 1.877 1.040 0.388 3 2011 1020 6420 0.151 1.922 1.077 0.379 4 2011 0 7200 0.303 1.971 1.090 0.379 5 2011 521 6919 0.272 1.872 1.064 0.377 6 2011 283 6917 0.266 1.762 1.028 0.379 7 2011 0 7440 0.259 1.748 1.007 0.387 8 2011 0 7440 0.305 1.882 1.076 0.401 9 2011 0 7200 0.238 1.946 1.049 0.404 10 2011 0 7440 0.223 1.890 1.052 0.398 11 2011 49 7151 0.256 1.903 1.089 0.389 12 2011 0 7440 0.341 1.883 1.111 0.379 Totals 33499 1631861 Mean sea level = 0.988 (Average monthly means = 0.988) Maximum recorded level of 2.124 metres at 0824 hours 15/02/2010 Minimum recorded level of -0.071 metres at 0230 hours 17/05/1995 Standard deviation of the observations = 0.3922 metres Skewness = -0.0139