| Long term mean parish rainfall (mm) 1951-1980 | |||||||||||||||||
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total | |||||
| Clarendon | 54 | 39 | 58 | 83 | 181 | 149 | 87 | 119 | 180 | 257 | 104 | 67 | 1378 | 1378 | Clarendon | ||
| St. Catherine | 53 | 50 | 57 | 91 | 171 | 139 | 108 | 138 | 174 | 238 | 121 | 88 | 1428 | 1428 | St. Catherine | ||
| Kingston/St. Andrew | 53 | 49 | 56 | 103 | 180 | 123 | 50 | 168 | 215 | 287 | 187 | 112 | 1583 | 1583 | Kingston/St. Andrew | ||
| St. Ann | 145 | 90 | 78 | 117 | 164 | 115 | 50 | 97 | 130 | 177 | 214 | 219 | 1596 | 1596 | St. Ann | ||
| Trelawny | 99 | 76 | 69 | 115 | 181 | 130 | 96 | 154 | 166 | 222 | 167 | 131 | 1606 | 1606 | Trelawny | ||
| Manchester | 60 | 52 | 85 | 134 | 237 | 175 | 102 | 169 | 213 | 291 | 118 | 70 | 1706 | 1706 | Manchester | ||
| St. James | 91 | 77 | 62 | 111 | 223 | 203 | 145 | 182 | 202 | 253 | 138 | 104 | 1791 | 1791 | St. James | ||
| St. Elizabeth | 69 | 60 | 84 | 182 | 243 | 163 | 145 | 204 | 211 | 273 | 133 | 71 | 1838 | 1838 | St. Elizabeth | ||
| St. Mary | 181 | 129 | 106 | 148 | 175 | 122 | 81 | 116 | 110 | 209 | 263 | 268 | 1908 | 1908 | St. Mary | ||
| Westmoreland | 64 | 70 | 91 | 164 | 302 | 262 | 261 | 275 | 245 | 290 | 122 | 70 | 2216 | 2216 | Westmoreland | ||
| St. Thomas | 121 | 91 | 65 | 120 | 251 | 219 | 150 | 213 | 281 | 368 | 232 | 177 | 2288 | 2288 | St. Thomas | ||
| Hanover | 88 | 91 | 87 | 146 | 294 | 309 | 237 | 275 | 264 | 291 | 133 | 87 | 2302 | 2302 | Hanover | ||
| Portland | 321 | 236 | 185 | 273 | 321 | 278 | 231 | 245 | 273 | 373 | 477 | 457 | 3670 | 3670 | Portland | ||
| Island | 108 | 85 | 83 | 137 | 225 | 184 | 134 | 181 | 205 | 271 | 185 | 148 | 1946 | ||||