Cumulus Frequency of Occurrence (%) October (1954 - 1997) Night, Ship Observations Only Global Average: 31.3 Zonal Averages 16 zones Lat.N Average 85 2.2 75 5.3 65 10.5 55 16.2 45 19.7 35 34.1 25 46.4 15 47.7 5 43.3 -5 47.2 -15 41.3 -25 33.9 -35 24.6 -45 16.2 -55 10.9 -65 8.5 Grid Box Averages 330 filled boxes Box # Lat.N Lon.E Average 1 85 60 5.0 2 85 180 0.7 3 85 300 0.6 4 75 20 11.2 5 75 60 9.8 6 75 100 2.5 7 75 140 4.6 8 75 180 1.3 9 75 220 0.8 10 75 260 4.8 11 75 300 4.4 12 75 340 7.5 13 65 10 13.2 14 65 30 9.1 15 65 50 10.4 21 65 170 9.9 22 65 190 8.8 23 65 210 6.3 26 65 270 3.1 27 65 290 5.6 28 65 310 8.9 29 65 330 13.9 30 65 350 13.6 31 55 10 18.3 32 55 30 22.4 38 55 150 14.5 39 55 170 16.4 40 55 190 15.1 41 55 210 20.8 42 55 230 20.3 44 55 270 8.7 45 55 290 6.7 46 55 310 13.6 47 55 330 17.3 48 55 350 16.6 49 45 5 25.9 50 45 15 21.8 51 45 25 16.2 52 45 35 22.2 53 45 45 18.7 54 45 55 15.8 62 45 135 17.1 63 45 145 21.8 64 45 155 19.7 65 45 165 17.1 66 45 175 16.2 67 45 185 15.9 68 45 195 18.7 69 45 205 19.8 70 45 215 19.4 71 45 225 21.9 72 45 235 16.9 77 45 285 18.1 78 45 295 18.3 79 45 305 18.6 80 45 315 20.4 81 45 325 22.9 82 45 335 22.9 83 45 345 22.0 84 45 355 20.2 85 35 5 32.9 86 35 15 36.0 87 35 25 28.3 88 35 35 35.6 97 35 125 29.0 98 35 135 39.5 99 35 145 34.3 100 35 155 29.1 101 35 165 31.4 102 35 175 28.1 103 35 185 26.8 104 35 195 30.3 105 35 205 33.4 106 35 215 32.7 107 35 225 29.4 108 35 235 20.7 109 35 245 15.2 112 35 275 36.2 113 35 285 35.6 114 35 295 41.4 115 35 305 44.4 116 35 315 47.4 117 35 325 44.0 118 35 335 36.5 119 35 345 39.5 120 35 355 24.7 124 25 35 12.5 125 25 45 6.8 126 25 55 8.1 127 25 65 22.3 129 25 85 37.4 132 25 115 33.6 133 25 125 41.0 134 25 135 46.9 135 25 145 52.6 136 25 155 51.5 137 25 165 51.0 138 25 175 48.8 139 25 185 51.5 140 25 195 55.4 141 25 205 56.2 142 25 215 48.9 143 25 225 34.3 144 25 235 24.2 145 25 245 30.4 146 25 255 44.1 147 25 265 46.6 148 25 275 50.0 149 25 285 49.0 150 25 295 53.1 151 25 305 56.8 152 25 315 57.0 153 25 325 57.1 154 25 335 52.7 155 25 345 25.5 160 15 35 19.4 161 15 45 28.9 162 15 55 44.3 163 15 65 56.4 164 15 75 43.0 165 15 85 50.2 166 15 95 50.0 167 15 105 48.1 168 15 115 45.3 169 15 125 39.9 170 15 135 44.5 171 15 145 44.3 172 15 155 46.3 173 15 165 46.3 174 15 175 50.9 175 15 185 55.5 176 15 195 56.2 177 15 205 49.6 178 15 215 45.2 179 15 225 41.7 180 15 235 34.4 181 15 245 45.2 182 15 255 47.1 183 15 265 36.6 184 15 275 42.6 185 15 285 52.4 186 15 295 56.0 187 15 305 57.8 188 15 315 53.6 189 15 325 58.0 190 15 335 47.7 191 15 345 24.5 193 5 5 31.8 197 5 45 66.6 198 5 55 61.9 199 5 65 61.3 200 5 75 45.8 201 5 85 41.8 202 5 95 36.1 203 5 105 41.3 204 5 115 41.3 205 5 125 40.1 206 5 135 45.1 207 5 145 38.2 208 5 155 40.5 209 5 165 52.3 210 5 175 47.5 211 5 185 53.1 212 5 195 55.0 213 5 205 51.9 214 5 215 43.8 215 5 225 43.7 216 5 235 37.1 217 5 245 34.5 218 5 255 23.2 219 5 265 19.7 220 5 275 22.0 221 5 285 29.8 223 5 305 58.3 224 5 315 57.1 225 5 325 54.7 226 5 335 41.6 227 5 345 35.5 228 5 355 30.5 229 -5 5 19.3 230 -5 15 27.8 233 -5 45 65.8 234 -5 55 56.5 235 -5 65 49.6 236 -5 75 39.9 237 -5 85 40.7 238 -5 95 43.4 239 -5 105 42.0 240 -5 115 47.8 241 -5 125 50.3 242 -5 135 49.0 243 -5 145 49.2 244 -5 155 41.5 245 -5 165 44.1 246 -5 175 53.1 247 -5 185 62.6 248 -5 195 69.7 249 -5 205 65.7 250 -5 215 68.4 251 -5 225 67.8 252 -5 235 67.4 253 -5 245 53.9 254 -5 255 25.4 255 -5 265 12.5 256 -5 275 10.9 257 -5 285 8.1 260 -5 315 58.7 261 -5 325 66.0 262 -5 335 59.0 263 -5 345 34.0 264 -5 355 18.9 265 -15 5 6.7 266 -15 15 18.2 268 -15 35 45.1 269 -15 45 51.0 270 -15 55 54.1 271 -15 65 52.0 272 -15 75 45.0 273 -15 85 40.0 274 -15 95 44.8 275 -15 105 56.1 276 -15 115 38.4 277 -15 125 32.5 278 -15 135 49.6 279 -15 145 51.0 280 -15 155 55.1 281 -15 165 44.2 282 -15 175 41.9 283 -15 185 47.9 284 -15 195 49.8 285 -15 205 49.8 286 -15 215 53.7 287 -15 225 63.7 288 -15 235 63.8 289 -15 245 53.2 290 -15 255 30.5 291 -15 265 19.3 292 -15 275 8.7 293 -15 285 11.8 297 -15 325 56.4 298 -15 335 44.5 299 -15 345 20.1 300 -15 355 7.0 301 -25 5 15.4 302 -25 15 23.3 304 -25 35 40.7 305 -25 45 40.2 306 -25 55 50.9 307 -25 65 39.0 308 -25 75 30.8 309 -25 85 30.0 310 -25 95 26.9 311 -25 105 32.5 312 -25 115 31.7 316 -25 155 47.4 317 -25 165 41.0 318 -25 175 38.4 319 -25 185 38.7 320 -25 195 34.7 321 -25 205 35.9 322 -25 215 39.2 323 -25 225 37.9 324 -25 235 44.3 325 -25 245 48.8 326 -25 255 34.7 327 -25 265 24.6 328 -25 275 25.7 329 -25 285 19.5 332 -25 315 25.5 333 -25 325 36.4 334 -25 335 31.3 335 -25 345 27.4 336 -25 355 20.9 337 -35 5 20.0 338 -35 15 28.1 339 -35 25 23.4 340 -35 35 26.7 341 -35 45 25.8 342 -35 55 28.7 343 -35 65 24.7 344 -35 75 15.6 345 -35 85 14.2 346 -35 95 18.1 347 -35 105 20.1 348 -35 115 29.4 349 -35 125 22.9 350 -35 135 23.6 351 -35 145 23.0 352 -35 155 28.4 353 -35 165 27.7 354 -35 175 28.1 355 -35 185 29.7 356 -35 195 28.3 357 -35 205 25.6 358 -35 215 26.4 359 -35 225 23.1 363 -35 265 23.6 364 -35 275 27.9 365 -35 285 29.7 367 -35 305 20.9 368 -35 315 32.8 369 -35 325 27.8 370 -35 335 23.5 371 -35 345 22.0 372 -35 355 17.4 379 -45 65 10.7 380 -45 75 15.0 387 -45 145 21.4 388 -45 155 23.3 389 -45 165 16.3 390 -45 175 18.5 391 -45 185 15.6 392 -45 195 12.4 393 -45 205 15.8 400 -45 275 17.5 401 -45 285 19.5 402 -45 295 15.2 403 -45 305 17.4 404 -45 315 15.2 408 -45 355 10.4 416 -55 150 11.3 417 -55 170 12.3 421 -55 250 6.1 422 -55 270 16.6 423 -55 290 9.4 424 -55 310 9.7 425 -55 330 10.8 432 -65 110 8.4 433 -65 130 19.8 442 -65 310 1.1