Cumulus Frequency of Occurrence (%) October (1954 - 1997) Day, Ship Observations Only Global Average: 35.0 Zonal Averages 17 zones Lat.N Average 85 2.3 75 5.9 65 11.8 55 17.3 45 22.4 35 37.0 25 49.8 15 51.5 5 47.8 -5 53.2 -15 47.4 -25 41.8 -35 29.0 -45 17.3 -55 12.9 -65 9.6 -75 14.9 Grid Box Averages 376 filled boxes Box # Lat.N Lon.E Average 1 85 60 4.5 2 85 180 0.6 3 85 300 1.7 4 75 20 10.6 5 75 60 10.1 6 75 100 3.8 7 75 140 3.7 8 75 180 2.1 9 75 220 2.6 10 75 260 5.2 11 75 300 6.8 12 75 340 8.0 13 65 10 13.4 14 65 30 12.6 15 65 50 11.9 16 65 70 20.2 20 65 150 14.6 21 65 170 13.7 22 65 190 10.2 23 65 210 11.8 25 65 250 2.6 26 65 270 5.6 27 65 290 7.9 28 65 310 11.6 29 65 330 14.7 30 65 350 13.7 31 55 10 20.7 32 55 30 20.4 37 55 130 19.2 38 55 150 17.9 39 55 170 18.5 40 55 190 16.1 41 55 210 19.8 42 55 230 19.6 44 55 270 4.8 45 55 290 15.5 46 55 310 15.0 47 55 330 17.0 48 55 350 18.7 49 45 5 30.0 50 45 15 30.3 51 45 25 26.5 52 45 35 27.7 53 45 45 16.9 54 45 55 17.8 62 45 135 24.8 63 45 145 26.9 64 45 155 22.4 65 45 165 19.2 66 45 175 18.7 67 45 185 19.4 68 45 195 18.4 69 45 205 19.3 70 45 215 20.3 71 45 225 23.0 72 45 235 19.1 77 45 285 23.4 78 45 295 24.7 79 45 305 24.4 80 45 315 22.2 81 45 325 24.7 82 45 335 24.9 83 45 345 23.9 84 45 355 24.3 85 35 5 37.6 86 35 15 42.1 87 35 25 39.2 88 35 35 45.4 90 35 55 21.3 96 35 115 18.7 97 35 125 31.1 98 35 135 40.5 99 35 145 35.8 100 35 155 32.5 101 35 165 33.8 102 35 175 31.2 103 35 185 32.2 104 35 195 30.6 105 35 205 32.1 106 35 215 35.6 107 35 225 34.0 108 35 235 24.3 109 35 245 18.0 112 35 275 38.2 113 35 285 38.5 114 35 295 43.1 115 35 305 45.5 116 35 315 48.6 117 35 325 45.0 118 35 335 41.6 119 35 345 42.9 120 35 355 28.3 124 25 35 20.6 125 25 45 6.5 126 25 55 12.9 127 25 65 27.9 128 25 75 19.4 129 25 85 45.3 130 25 95 38.3 131 25 105 43.3 132 25 115 37.8 133 25 125 45.5 134 25 135 49.4 135 25 145 53.7 136 25 155 55.2 137 25 165 55.1 138 25 175 53.6 139 25 185 57.6 140 25 195 55.3 141 25 205 58.0 142 25 215 50.7 143 25 225 38.3 144 25 235 31.9 145 25 245 34.7 146 25 255 54.7 147 25 265 48.0 148 25 275 51.9 149 25 285 51.7 150 25 295 55.5 151 25 305 60.0 152 25 315 60.3 153 25 325 59.4 154 25 335 57.0 155 25 345 28.7 160 15 35 38.0 161 15 45 38.0 162 15 55 54.2 163 15 65 56.0 164 15 75 48.0 165 15 85 49.8 166 15 95 50.0 167 15 105 48.8 168 15 115 47.9 169 15 125 44.7 170 15 135 47.4 171 15 145 49.3 172 15 155 51.0 173 15 165 54.9 174 15 175 54.8 175 15 185 59.2 176 15 195 60.0 177 15 205 54.5 178 15 215 48.7 179 15 225 44.2 180 15 235 45.8 181 15 245 50.6 182 15 255 53.4 183 15 265 44.0 184 15 275 43.4 185 15 285 54.2 186 15 295 59.6 187 15 305 59.4 188 15 315 56.2 189 15 325 56.6 190 15 335 50.5 191 15 345 27.9 193 5 5 37.7 197 5 45 70.6 198 5 55 65.9 199 5 65 65.1 200 5 75 52.6 201 5 85 46.9 202 5 95 40.8 203 5 105 44.0 204 5 115 41.9 205 5 125 48.5 206 5 135 45.7 207 5 145 44.8 208 5 155 47.8 209 5 165 52.2 210 5 175 48.3 211 5 185 57.9 212 5 195 54.5 213 5 205 54.2 214 5 215 44.6 215 5 225 47.5 216 5 235 40.9 217 5 245 40.0 218 5 255 33.8 219 5 265 27.2 220 5 275 27.4 221 5 285 31.5 223 5 305 60.1 224 5 315 60.4 225 5 325 58.8 226 5 335 48.5 227 5 345 44.5 228 5 355 42.6 229 -5 5 29.7 230 -5 15 20.0 232 -5 35 60.5 233 -5 45 69.2 234 -5 55 63.9 235 -5 65 54.2 236 -5 75 44.4 237 -5 85 43.9 238 -5 95 44.4 239 -5 105 45.8 240 -5 115 58.3 241 -5 125 60.4 242 -5 135 62.5 243 -5 145 48.3 244 -5 155 45.7 245 -5 165 51.8 246 -5 175 55.0 247 -5 185 60.6 248 -5 195 67.6 249 -5 205 73.6 250 -5 215 69.2 251 -5 225 72.1 252 -5 235 72.6 253 -5 245 60.2 254 -5 255 43.2 255 -5 265 25.6 256 -5 275 17.4 257 -5 285 5.4 260 -5 315 66.1 261 -5 325 72.1 262 -5 335 61.8 263 -5 345 46.4 264 -5 355 31.8 265 -15 5 12.2 266 -15 15 14.9 268 -15 35 54.4 269 -15 45 64.4 270 -15 55 61.7 271 -15 65 54.5 272 -15 75 49.6 273 -15 85 48.5 274 -15 95 52.1 275 -15 105 56.4 276 -15 115 42.5 277 -15 125 56.7 278 -15 135 67.9 279 -15 145 63.2 280 -15 155 60.1 281 -15 165 52.5 282 -15 175 46.3 283 -15 185 48.5 284 -15 195 51.6 285 -15 205 50.9 286 -15 215 58.8 287 -15 225 69.3 288 -15 235 68.2 289 -15 245 55.9 290 -15 255 43.6 291 -15 265 29.8 292 -15 275 13.3 293 -15 285 9.8 297 -15 325 59.5 298 -15 335 51.8 299 -15 345 33.0 300 -15 355 12.0 301 -25 5 24.6 302 -25 15 23.0 304 -25 35 45.1 305 -25 45 46.5 306 -25 55 55.7 307 -25 65 47.3 308 -25 75 43.3 309 -25 85 39.8 310 -25 95 40.0 311 -25 105 36.8 312 -25 115 36.6 315 -25 145 64.0 316 -25 155 55.4 317 -25 165 52.9 318 -25 175 48.0 319 -25 185 44.3 320 -25 195 40.9 321 -25 205 41.3 322 -25 215 44.0 323 -25 225 43.6 324 -25 235 51.6 325 -25 245 55.3 326 -25 255 45.5 327 -25 265 39.3 328 -25 275 30.5 329 -25 285 23.7 332 -25 315 29.3 333 -25 325 41.3 334 -25 335 42.1 335 -25 345 39.9 336 -25 355 32.9 337 -35 5 27.2 338 -35 15 30.4 339 -35 25 28.9 340 -35 35 32.7 341 -35 45 29.0 342 -35 55 28.8 343 -35 65 28.9 344 -35 75 24.9 345 -35 85 23.3 346 -35 95 24.9 347 -35 105 23.5 348 -35 115 30.9 349 -35 125 27.6 350 -35 135 26.4 351 -35 145 28.6 352 -35 155 35.5 353 -35 165 33.6 354 -35 175 35.0 355 -35 185 32.5 356 -35 195 32.4 357 -35 205 29.9 358 -35 215 22.6 359 -35 225 30.0 360 -35 235 30.1 361 -35 245 26.0 362 -35 255 25.0 363 -35 265 28.6 364 -35 275 29.6 365 -35 285 30.5 366 -35 295 28.4 367 -35 305 23.7 368 -35 315 32.5 369 -35 325 34.2 370 -35 335 31.2 371 -35 345 26.1 372 -35 355 27.3 373 -45 5 6.9 376 -45 35 21.0 377 -45 45 16.2 378 -45 55 13.4 379 -45 65 15.1 380 -45 75 18.1 381 -45 85 21.9 382 -45 95 10.6 383 -45 105 16.3 384 -45 115 19.5 385 -45 125 24.2 386 -45 135 19.2 387 -45 145 28.3 388 -45 155 24.5 389 -45 165 22.8 390 -45 175 26.9 391 -45 185 16.7 392 -45 195 15.9 393 -45 205 15.6 394 -45 215 15.2 395 -45 225 12.1 396 -45 235 13.0 397 -45 245 18.1 400 -45 275 15.7 401 -45 285 22.6 402 -45 295 15.3 403 -45 305 15.6 404 -45 315 20.3 405 -45 325 16.8 406 -45 335 11.9 407 -45 345 12.3 408 -45 355 15.5 409 -55 10 9.3 411 -55 50 11.6 412 -55 70 21.3 413 -55 90 9.3 414 -55 110 14.6 415 -55 130 9.0 416 -55 150 15.9 417 -55 170 14.5 419 -55 210 17.8 420 -55 230 14.8 421 -55 250 6.9 422 -55 270 16.2 423 -55 290 15.8 424 -55 310 11.3 425 -55 330 16.0 426 -55 350 2.3 429 -65 50 5.2 430 -65 70 6.6 432 -65 110 8.2 433 -65 130 20.2 434 -65 150 13.0 442 -65 310 7.6 444 -65 350 8.3 453 -75 340 14.9