| Measurements in Millimetres | Inches | |||||||||||||||||||||||||
| Month | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | Average | Max. | Min. | Average | Max. | Min. | |
| January | 49.9 | 219.1 | 82.9 | 202.7 | 257.7 | 282.9 | 167.9 | 160.1 | 376.7 | 233.7 | 241.8 | 91.8 | 113.6 | 209.8 | 253.0 | 229.4 | 115.9 | 266.8 | 155.0 | 197.54 | 376.7 | 49.9 | 7.62 | 14.83 | 1.96 | |
| February | 46.9 | 1.7 | 96.3 | 152.5 | 348.8 | 348.3 | 75.2 | 235.6 | 97.1 | 74.1 | 206.1 | 152.0 | 309.5 | 262.3 | 150.5 | 232.9 | 87.3 | 245.5 | 57.7 | 173.48 | 348.8 | 1.7 | 6.66 | 13.73 | 0.07 | |
| March | 64.9 | 234.4 | 217.4 | 207.5 | 210.6 | 322.6 | 160.5 | 237.9 | 134.2 | 261.0 | 147.5 | 45.2 | 176.2 | 114.0 | 155.3 | 97.5 | 63.6 | 139.3 | 166.09 | 322.6 | 45.2 | 6.60 | 12.70 | 1.78 | ||
| April | 136.8 | 76.7 | 55.9 | 53.4 | 47.1 | 135.2 | 148.2 | 134.5 | 123.9 | 152.4 | 43.3 | 128.2 | 100.6 | 62.8 | 128.7 | 31.4 | 52.6 | 119.2 | 96.16 | 152.4 | 31.4 | 3.84 | 6.00 | 1.24 | ||
| May | 76.2 | 219.6 | 92.4 | 55.6 | 40.9 | 37.4 | 34.8 | 109.3 | 62.2 | 35.5 | 77.5 | 93.6 | 87.3 | 43.9 | 100.4 | 53.1 | 36.9 | 110.0 | 75.92 | 219.6 | 34.8 | 3.00 | 8.65 | 1.37 | ||
| June | 62.0 | 47.4 | 46.4 | 32.4 | 101.0 | 139.6 | 112.5 | 30.5 | 66.5 | 154.2 | 35.8 | 115.9 | 47.5 | 156.9 | 122.7 | 88.8 | 109.6 | 182.1 | 91.05 | 156.9 | 30.5 | 3.35 | 6.18 | 1.20 | ||
| July | 247.7 | 84.2 | 104.7 | 265.9 | 61.2 | 85.7 | 117.9 | 129.1 | 129.2 | 82.1 | 152.9 | 90.1 | 95.7 | 177.3 | 90.5 | 30.0 | 138.8 | 113.8 | 122.04 | 265.9 | 30.0 | 4.78 | 10.47 | 1.18 | ||
| August | 269.1 | 105.6 | 133.5 | 233.9 | 284.5 | 117.6 | 105.0 | 314.3 | 87.7 | 152.3 | 26.3 | 69.7 | 93.9 | 194.7 | 110.5 | 120.5 | 145.9 | 97.0 | 147.89 | 314.3 | 26.3 | 5.95 | 12.37 | 1.04 | ||
| September | 215.2 | 60.2 | 227.6 | 199.3 | 145.5 | 186.5 | 181.1 | 187.8 | 39.2 | 76.6 | 130.8 | 87.8 | 163.0 | 103.7 | 214.5 | 173.3 | 115.6 | 65.9 | 147.98 | 263.4 | 39.2 | 5.89 | 8.96 | 1.54 | ||
| October | 101.7 | 181.7 | 221.1 | 183.1 | 269.2 | 302.2 | 189.1 | 131.2 | 35.0 | 162.1 | 299.2 | 302.9 | 114.1 | 278.2 | 126.3 | 259.8 | 275.6 | 155.7 | 199.24 | 302.9 | 35.0 | 7.77 | 11.93 | 1.38 | ||
| November | 154.3 | 257.8 | 128.2 | 120.7 | 75.8 | 81.3 | 317.7 | 264.9 | 94.6 | 142.5 | 124.0 | 211.0 | 95.7 | 195.4 | 244.7 | 128.8 | 189.5 | 154.2 | 165.62 | 317.7 | 75.8 | 6.49 | 12.51 | 2.98 | ||
| December | 203.8 | 337.8 | 177.5 | 205.8 | 81.4 | 233.5 | 172.5 | 179.8 | 269.8 | 279.2 | 21.2 | 73.7 | 187.1 | 227.2 | 296.5 | 209.2 | 96.8 | 49.9 | 183.48 | 337.8 | 21.2 | 7.77 | 13.30 | 0.83 | ||
| Annual Total | 1628.5 | 1826.2 | 1583.9 | 1912.8 | 1923.7 | 2272.8 | 1782.4 | 2115 | 1516.1 | 1805.7 | 1506.4 | 1461.9 | 1584.2 | 2026.2 | 1993.6 | 1654.7 | 1428.1 | 1699.4 | 1787.13 | 2272.8 | 1461.9 | 70.36 | 89.48 | 57.56 | ||
| 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | Average | Max. | Min. | Average | Max. | Min. | |||
| Measurements in Millimetres | Inches | |||||||||||||||||||||||||