Cumulus Frequency of Occurrence (%) October (1954 - 1997) , Ship Observations Only Global Average: 33.0 Zonal Averages 17 zones Lat.N Average 85 2.2 75 5.6 65 11.1 55 16.8 45 21.1 35 35.5 25 48.1 15 49.6 5 45.5 -5 50.2 -15 44.3 -25 37.9 -35 27.0 -45 16.4 -55 12.4 -65 7.3 -75 14.4 Grid Box Averages 386 filled boxes Box # Lat.N Lon.E Average 1 85 60 4.8 2 85 180 0.6 3 85 300 1.1 4 75 20 10.9 5 75 60 10.0 6 75 100 3.2 7 75 140 4.2 8 75 180 1.7 9 75 220 1.7 10 75 260 5.0 11 75 300 5.6 12 75 340 7.8 13 65 10 13.3 14 65 30 10.9 15 65 50 11.1 16 65 70 20.4 20 65 150 13.7 21 65 170 11.8 22 65 190 9.5 23 65 210 9.1 25 65 250 2.4 26 65 270 4.4 27 65 290 6.7 28 65 310 10.2 29 65 330 14.3 30 65 350 13.7 31 55 10 19.5 32 55 30 21.4 37 55 130 20.6 38 55 150 16.2 39 55 170 17.5 40 55 190 15.6 41 55 210 20.3 42 55 230 19.9 44 55 270 6.8 45 55 290 11.1 46 55 310 14.3 47 55 330 17.2 48 55 350 17.7 49 45 5 28.0 50 45 15 26.0 51 45 25 21.4 52 45 35 24.9 53 45 45 17.8 54 45 55 16.8 62 45 135 21.0 63 45 145 24.3 64 45 155 21.1 65 45 165 18.2 66 45 175 17.4 67 45 185 17.7 68 45 195 18.6 69 45 205 19.5 70 45 215 19.9 71 45 225 22.4 72 45 235 18.0 77 45 285 20.7 78 45 295 21.5 79 45 305 21.5 80 45 315 21.3 81 45 325 23.8 82 45 335 23.9 83 45 345 23.0 84 45 355 22.2 85 35 5 35.2 86 35 15 39.1 87 35 25 33.7 88 35 35 40.5 89 35 45 23.8 90 35 55 20.3 96 35 115 17.4 97 35 125 30.1 98 35 135 40.0 99 35 145 35.0 100 35 155 30.8 101 35 165 32.6 102 35 175 29.6 103 35 185 29.5 104 35 195 30.5 105 35 205 32.8 106 35 215 34.1 107 35 225 31.7 108 35 235 22.5 109 35 245 16.6 112 35 275 37.2 113 35 285 37.1 114 35 295 42.3 115 35 305 44.9 116 35 315 48.0 117 35 325 44.5 118 35 335 39.0 119 35 345 41.2 120 35 355 26.5 124 25 35 16.6 125 25 45 6.7 126 25 55 10.5 127 25 65 25.1 128 25 75 18.9 129 25 85 41.3 130 25 95 34.4 131 25 105 42.8 132 25 115 35.7 133 25 125 43.2 134 25 135 48.1 135 25 145 53.2 136 25 155 53.4 137 25 165 53.1 138 25 175 51.2 139 25 185 54.6 140 25 195 55.3 141 25 205 57.1 142 25 215 49.8 143 25 225 36.3 144 25 235 28.0 145 25 245 32.5 146 25 255 49.4 147 25 265 47.3 148 25 275 50.9 149 25 285 50.4 150 25 295 54.3 151 25 305 58.4 152 25 315 58.6 153 25 325 58.3 154 25 335 54.9 155 25 345 27.1 160 15 35 28.7 161 15 45 33.4 162 15 55 49.3 163 15 65 56.2 164 15 75 45.5 165 15 85 50.0 166 15 95 50.0 167 15 105 48.4 168 15 115 46.6 169 15 125 42.3 170 15 135 46.0 171 15 145 46.8 172 15 155 48.7 173 15 165 50.6 174 15 175 52.9 175 15 185 57.4 176 15 195 58.1 177 15 205 52.1 178 15 215 47.0 179 15 225 43.0 180 15 235 40.1 181 15 245 47.9 182 15 255 50.3 183 15 265 40.3 184 15 275 43.0 185 15 285 53.3 186 15 295 57.8 187 15 305 58.6 188 15 315 54.9 189 15 325 57.3 190 15 335 49.1 191 15 345 26.1 193 5 5 34.7 197 5 45 68.6 198 5 55 63.9 199 5 65 63.2 200 5 75 49.2 201 5 85 44.3 202 5 95 38.5 203 5 105 42.6 204 5 115 41.6 205 5 125 44.3 206 5 135 45.4 207 5 145 41.5 208 5 155 44.2 209 5 165 52.2 210 5 175 47.9 211 5 185 55.5 212 5 195 54.7 213 5 205 53.0 214 5 215 44.2 215 5 225 45.6 216 5 235 39.0 217 5 245 37.3 218 5 255 28.5 219 5 265 23.5 220 5 275 24.7 221 5 285 30.6 222 5 295 50.0 223 5 305 59.2 224 5 315 58.7 225 5 325 56.8 226 5 335 45.1 227 5 345 40.0 228 5 355 36.6 229 -5 5 24.5 230 -5 15 23.9 232 -5 35 59.0 233 -5 45 67.5 234 -5 55 60.2 235 -5 65 51.9 236 -5 75 42.1 237 -5 85 42.3 238 -5 95 43.9 239 -5 105 43.9 240 -5 115 53.1 241 -5 125 55.3 242 -5 135 55.8 243 -5 145 48.8 244 -5 155 43.6 245 -5 165 48.0 246 -5 175 54.0 247 -5 185 61.6 248 -5 195 68.7 249 -5 205 69.6 250 -5 215 68.8 251 -5 225 69.9 252 -5 235 70.0 253 -5 245 57.0 254 -5 255 34.3 255 -5 265 19.0 256 -5 275 14.2 257 -5 285 6.8 260 -5 315 62.4 261 -5 325 69.0 262 -5 335 60.4 263 -5 345 40.2 264 -5 355 25.4 265 -15 5 9.4 266 -15 15 16.6 268 -15 35 49.7 269 -15 45 57.7 270 -15 55 57.9 271 -15 65 53.3 272 -15 75 47.3 273 -15 85 44.2 274 -15 95 48.4 275 -15 105 56.3 276 -15 115 40.5 277 -15 125 44.6 278 -15 135 58.7 279 -15 145 57.1 280 -15 155 57.6 281 -15 165 48.4 282 -15 175 44.1 283 -15 185 48.2 284 -15 195 50.7 285 -15 205 50.3 286 -15 215 56.3 287 -15 225 66.5 288 -15 235 66.0 289 -15 245 54.5 290 -15 255 37.0 291 -15 265 24.5 292 -15 275 11.0 293 -15 285 10.8 297 -15 325 57.9 298 -15 335 48.1 299 -15 345 26.6 300 -15 355 9.5 301 -25 5 20.0 302 -25 15 23.1 304 -25 35 42.9 305 -25 45 43.3 306 -25 55 53.3 307 -25 65 43.1 308 -25 75 37.0 309 -25 85 34.9 310 -25 95 33.5 311 -25 105 34.6 312 -25 115 34.1 315 -25 145 56.6 316 -25 155 51.4 317 -25 165 46.9 318 -25 175 43.2 319 -25 185 41.5 320 -25 195 37.8 321 -25 205 38.6 322 -25 215 41.6 323 -25 225 40.8 324 -25 235 47.9 325 -25 245 52.0 326 -25 255 40.1 327 -25 265 32.0 328 -25 275 28.1 329 -25 285 21.6 332 -25 315 27.4 333 -25 325 38.9 334 -25 335 36.7 335 -25 345 33.7 336 -25 355 26.9 337 -35 5 23.6 338 -35 15 29.3 339 -35 25 26.2 340 -35 35 29.7 341 -35 45 27.4 342 -35 55 28.7 343 -35 65 26.8 344 -35 75 20.2 345 -35 85 18.8 346 -35 95 21.5 347 -35 105 21.8 348 -35 115 30.1 349 -35 125 25.3 350 -35 135 25.0 351 -35 145 25.8 352 -35 155 31.9 353 -35 165 30.6 354 -35 175 31.5 355 -35 185 31.1 356 -35 195 30.3 357 -35 205 27.7 358 -35 215 24.5 359 -35 225 26.6 360 -35 235 31.7 361 -35 245 25.9 362 -35 255 26.4 363 -35 265 26.1 364 -35 275 28.8 365 -35 285 30.1 366 -35 295 30.6 367 -35 305 22.3 368 -35 315 32.6 369 -35 325 31.0 370 -35 335 27.4 371 -35 345 24.1 372 -35 355 22.3 373 -45 5 6.2 375 -45 25 10.6 376 -45 35 22.9 377 -45 45 16.4 378 -45 55 13.3 379 -45 65 12.9 380 -45 75 16.6 381 -45 85 17.4 382 -45 95 12.0 383 -45 105 17.2 384 -45 115 24.3 385 -45 125 24.8 386 -45 135 17.2 387 -45 145 24.9 388 -45 155 23.9 389 -45 165 19.5 390 -45 175 22.7 391 -45 185 16.2 392 -45 195 14.1 393 -45 205 15.7 394 -45 215 15.9 395 -45 225 12.2 396 -45 235 13.5 397 -45 245 17.3 398 -45 255 13.9 399 -45 265 21.6 400 -45 275 16.6 401 -45 285 21.0 402 -45 295 15.2 403 -45 305 16.5 404 -45 315 17.7 405 -45 325 10.2 406 -45 335 11.7 407 -45 345 12.1 408 -45 355 13.0 409 -55 10 9.3 410 -55 30 7.7 411 -55 50 10.9 412 -55 70 17.4 413 -55 90 9.3 414 -55 110 14.1 415 -55 130 8.0 416 -55 150 13.6 417 -55 170 13.4 418 -55 190 23.2 419 -55 210 18.5 420 -55 230 16.0 421 -55 250 6.5 422 -55 270 16.4 423 -55 290 12.6 424 -55 310 10.5 425 -55 330 13.4 426 -55 350 2.2 429 -65 50 2.6 430 -65 70 7.4 431 -65 90 2.6 432 -65 110 8.3 433 -65 130 20.0 434 -65 150 8.9 435 -65 170 7.9 441 -65 290 6.7 442 -65 310 4.3 444 -65 350 6.4 453 -75 340 14.4