Max/min are the highest and lowest readings
for the month
Dt is the date of the reading
| Month | 2006 | 2007 | 2008 | 2009 | 2010 | |||||
| Max/min | Dt | Max/min | Dt | Max/min | Dt | Max/min | Dt | Max/min | Dt | |
| Jan | 1041 | 22 | 1036 | 2 | 1049.9 | 24 | 1032.9 | 3 | 1042.5 | 26 |
| 998 | 1 | 995 | 18 | 978.2 | 15 | 970.8 | 22 | 990.9 | 28 | |
| Feb | 1038 | 5 | 1044 | 3 | 1044.0 | 16 | 1036.4 | 20 | 1025.6 | 12 |
| 985 | 16 | 981 | 12 | 990.9 | 3 | 979.6 | 9 | 979.0 | 25 | |
| March | 1032 | 12 | 1042.5 | 10 | 1039.8 | 4,5 | 1034.9 | 21,22 | 1033.6 | 6 |
| 990 | 24 | 991 | 2 | 963.7 | 10 | 981.2 | 4 | 982.7 | 30 | |
| April | 1032 | 28 | 1032 | 8 | 1033.7 | 2,3 | 1029.0 | 21 | 1032.2 | 9 |
| 1006 | 1 | 1015 | 25 | 987.7 | 29 | 993.9 | 26 | 997.2 | 3 | |
| May | 1031 | 31 | 1038 | 23 | 1026.8 | 5 | 1031.9 | 28 | 1033.0 | 19 |
| 985 | 22 | 997 | 27 | 1002.8 | 28 | 999.8 | 15 | 1006.2 | 29 | |
| June | 1035 | 3 | 1030 | 2 | 1027.8 | 8 | 1028.0 | 22 | 1027.9 | 15 |
| 1012 | 11 | 999 | 25 | 989.6 | 19 | 996.2 | 6 | 998.9 | 8 | |
| July | 1036 | 14 | 1026 | 30 | 1029.2 | 21, 22 | 1023.6 | 30 | 1026.6 | 5 |
| 1011 | 29 | 999 | 23 | 996.9 | 6 | 1000.1 | 21, 22 | 996.6 | 14 | |
| August | 1038 | 8 | 1031.6 | 26 | 1025.3 | 26 | 1023.1 | 29 | 1026.3 | 30 |
| 1002 | 17 | 995.6 | 14 | 987.9 | 11 | 1003.3 | 31 | 996.4 | 22 | |
| Sept | 1034 | 8 | 1034.6 | 6 | 1036.9 | 26 | 1036.7 | 10 | 1028.2 | 12 |
| 1001 | 21 | 1004.3 | 23 | 985.0 | 5 | 994.0 | 2 | 998.4 | 6 | |
| Oct | 1034 | 13 | 1038.5 | 19 | 1034.1 | 9 | 1033.7 | 16 | 1031.0 | 25 |
| 985 | 23 | 1010.3 | 16 | 991.2 | 29 | 990.8 | 20,21 | 988.8 | 3 | |
| Nov | 1040 | 3 | 1038.2 | 6 | 1036.7 | 16 | 1019.9 | 9 | 967.1 | 8 |
| 982 | 25 | 991.4 | 18 | 992.5 | 23 | 976.4 | 29 | 1022.3 | 15 | |
| Dec | 1049 | 22 | 1042.5 | 13 | 1039.0 | 23 | 1033.1 | 11 | 1039.6 | 14 |
| 987 | 8 | 981 | 9 | 982.1 | 4 | 984.5 | 21 | 990.5 | 17 | |