Cumulus Frequency of Occurrence (%) December (1953 - 1996) , Ship Observations Only Global Average: 32.8 Zonal Averages 17 zones Lat.N Average 85 0.5 75 4.9 65 11.4 55 15.2 45 17.7 35 28.9 25 40.7 15 48.7 5 44.1 -5 49.4 -15 46.4 -25 43.0 -35 30.9 -45 19.5 -55 12.2 -65 8.0 -75 9.9 Grid Box Averages 386 filled boxes Box # Lat.N Lon.E Average 1 85 60 0.6 2 85 180 0.2 3 85 300 0.7 4 75 20 11.7 5 75 60 7.2 6 75 100 5.4 7 75 140 0.0 8 75 180 0.5 9 75 220 0.8 12 75 340 11.8 13 65 10 12.4 14 65 30 10.9 15 65 50 11.1 21 65 170 8.8 22 65 190 8.3 23 65 210 10.5 27 65 290 10.0 28 65 310 10.4 29 65 330 12.7 30 65 350 13.7 31 55 10 17.7 32 55 30 11.3 38 55 150 13.0 39 55 170 13.4 40 55 190 14.1 41 55 210 14.3 42 55 230 15.6 45 55 290 17.4 46 55 310 18.1 47 55 330 15.6 48 55 350 16.4 49 45 5 26.2 50 45 15 24.4 51 45 25 17.7 52 45 35 18.3 53 45 45 12.7 54 45 55 18.1 61 45 125 28.9 62 45 135 20.0 63 45 145 20.1 64 45 155 15.8 65 45 165 15.3 66 45 175 17.5 67 45 185 18.8 68 45 195 17.8 69 45 205 14.9 70 45 215 14.9 71 45 225 15.9 72 45 235 17.1 77 45 285 20.5 78 45 295 19.9 79 45 305 14.6 80 45 315 17.2 81 45 325 19.8 82 45 335 19.5 83 45 345 19.0 84 45 355 20.6 85 35 5 31.2 86 35 15 35.3 87 35 25 38.2 88 35 35 42.8 89 35 45 19.6 90 35 55 27.9 96 35 115 14.8 97 35 125 25.4 98 35 135 36.9 99 35 145 31.0 100 35 155 26.9 101 35 165 28.0 102 35 175 24.9 103 35 185 24.1 104 35 195 23.9 105 35 205 23.8 106 35 215 23.2 107 35 225 23.3 108 35 235 22.2 109 35 245 20.0 112 35 275 26.0 113 35 285 30.4 114 35 295 31.3 115 35 305 31.7 116 35 315 35.6 117 35 325 32.3 118 35 335 30.1 119 35 345 33.8 120 35 355 27.8 124 25 35 35.1 125 25 45 26.1 126 25 55 29.4 127 25 65 35.5 128 25 75 8.8 129 25 85 18.2 131 25 105 19.0 132 25 115 26.3 133 25 125 30.2 134 25 135 36.0 135 25 145 41.5 136 25 155 42.1 137 25 165 43.3 138 25 175 42.1 139 25 185 44.8 140 25 195 45.4 141 25 205 45.0 142 25 215 38.1 143 25 225 29.1 144 25 235 27.2 145 25 245 28.2 146 25 255 34.0 147 25 265 32.1 148 25 275 43.2 149 25 285 47.4 150 25 295 52.1 151 25 305 54.6 152 25 315 52.2 153 25 325 50.0 154 25 335 46.6 155 25 345 26.6 160 15 35 45.1 161 15 45 42.7 162 15 55 56.7 163 15 65 54.5 164 15 75 31.9 165 15 85 47.3 166 15 95 49.9 167 15 105 37.1 168 15 115 42.7 169 15 125 39.1 170 15 135 44.4 171 15 145 53.8 172 15 155 57.8 173 15 165 58.1 174 15 175 53.2 175 15 185 52.8 176 15 195 51.9 177 15 205 50.4 178 15 215 43.9 179 15 225 35.1 180 15 235 33.3 181 15 245 44.0 182 15 255 48.1 183 15 265 40.2 184 15 275 45.0 185 15 285 57.5 186 15 295 60.7 187 15 305 63.3 188 15 315 60.0 189 15 325 52.3 190 15 335 41.2 191 15 345 11.5 193 5 5 40.5 197 5 45 64.0 198 5 55 60.4 199 5 65 61.8 200 5 75 46.7 201 5 85 44.4 202 5 95 42.5 203 5 105 36.8 204 5 115 39.7 205 5 125 45.2 206 5 135 46.4 207 5 145 44.1 208 5 155 48.1 209 5 165 46.7 210 5 175 45.6 211 5 185 48.0 212 5 195 50.8 213 5 205 48.8 214 5 215 41.2 215 5 225 40.1 216 5 235 31.9 217 5 245 32.6 218 5 255 36.1 219 5 265 34.9 220 5 275 36.6 221 5 285 37.0 223 5 305 52.8 224 5 315 45.9 225 5 325 49.3 226 5 335 43.0 227 5 345 34.6 228 5 355 41.1 229 -5 5 38.3 230 -5 15 27.6 232 -5 35 57.2 233 -5 45 62.5 234 -5 55 53.9 235 -5 65 50.4 236 -5 75 47.9 237 -5 85 43.8 238 -5 95 44.4 239 -5 105 37.3 240 -5 115 38.4 241 -5 125 44.4 242 -5 135 48.1 243 -5 145 38.2 244 -5 155 44.5 245 -5 165 41.1 246 -5 175 42.8 247 -5 185 49.2 248 -5 195 60.6 249 -5 205 67.9 250 -5 215 68.4 251 -5 225 68.2 252 -5 235 68.1 253 -5 245 54.2 254 -5 255 37.5 255 -5 265 30.9 256 -5 275 25.9 257 -5 285 22.0 260 -5 315 61.5 261 -5 325 69.7 262 -5 335 61.3 263 -5 345 48.8 264 -5 355 37.9 265 -15 5 17.7 266 -15 15 18.0 268 -15 35 50.3 269 -15 45 53.7 270 -15 55 60.4 271 -15 65 60.5 272 -15 75 52.3 273 -15 85 52.8 274 -15 95 49.5 275 -15 105 47.0 276 -15 115 43.4 277 -15 125 51.0 278 -15 135 52.6 279 -15 145 52.7 280 -15 155 58.3 281 -15 165 51.3 282 -15 175 52.2 283 -15 185 45.0 284 -15 195 43.0 285 -15 205 44.8 286 -15 215 52.2 287 -15 225 58.3 288 -15 235 62.8 289 -15 245 59.3 290 -15 255 41.2 291 -15 265 30.7 292 -15 275 23.3 293 -15 285 21.7 297 -15 325 57.1 298 -15 335 53.0 299 -15 345 32.7 300 -15 355 20.3 301 -25 5 27.1 302 -25 15 26.3 304 -25 35 48.1 305 -25 45 49.3 306 -25 55 52.8 307 -25 65 52.0 308 -25 75 52.6 309 -25 85 47.8 310 -25 95 39.8 311 -25 105 34.0 312 -25 115 34.9 315 -25 145 59.3 316 -25 155 54.1 317 -25 165 52.9 318 -25 175 52.0 319 -25 185 47.4 320 -25 195 43.5 321 -25 205 43.5 322 -25 215 40.5 323 -25 225 45.6 324 -25 235 54.6 325 -25 245 53.9 326 -25 255 40.5 327 -25 265 39.3 328 -25 275 27.7 329 -25 285 17.8 332 -25 315 33.4 333 -25 325 41.9 334 -25 335 44.9 335 -25 345 42.8 336 -25 355 35.9 337 -35 5 32.7 338 -35 15 33.3 339 -35 25 33.2 340 -35 35 35.2 341 -35 45 36.4 342 -35 55 31.2 343 -35 65 29.2 344 -35 75 30.5 345 -35 85 29.4 346 -35 95 24.7 347 -35 105 27.9 348 -35 115 31.8 349 -35 125 25.9 350 -35 135 26.2 351 -35 145 25.3 352 -35 155 32.0 353 -35 165 33.6 354 -35 175 37.0 355 -35 185 38.7 356 -35 195 36.1 357 -35 205 33.5 358 -35 215 29.3 359 -35 225 29.6 360 -35 235 34.5 361 -35 245 23.4 362 -35 255 27.9 363 -35 265 28.7 364 -35 275 27.6 365 -35 285 24.0 367 -35 305 28.1 368 -35 315 35.0 369 -35 325 33.1 370 -35 335 29.6 371 -35 345 28.2 372 -35 355 29.5 373 -45 5 13.1 374 -45 15 21.2 375 -45 25 17.2 376 -45 35 22.5 377 -45 45 14.7 378 -45 55 18.6 379 -45 65 16.2 380 -45 75 14.5 381 -45 85 19.7 382 -45 95 19.8 383 -45 105 24.1 384 -45 115 24.2 385 -45 125 25.9 386 -45 135 26.0 387 -45 145 23.2 388 -45 155 22.8 389 -45 165 21.9 390 -45 175 23.1 391 -45 185 21.3 392 -45 195 21.5 393 -45 205 22.1 394 -45 215 17.2 395 -45 225 12.3 396 -45 235 18.1 397 -45 245 8.3 398 -45 255 14.6 399 -45 265 19.7 400 -45 275 24.9 401 -45 285 22.7 402 -45 295 17.0 403 -45 305 23.3 404 -45 315 26.2 405 -45 325 19.3 406 -45 335 14.8 407 -45 345 18.0 408 -45 355 12.5 409 -55 10 9.7 410 -55 30 10.3 411 -55 50 13.5 412 -55 70 12.0 413 -55 90 12.1 414 -55 110 17.7 415 -55 130 12.3 416 -55 150 9.2 417 -55 170 15.2 418 -55 190 7.2 419 -55 210 10.7 420 -55 230 13.4 421 -55 250 11.0 422 -55 270 15.9 423 -55 290 16.0 424 -55 310 11.3 425 -55 330 11.4 426 -55 350 11.9 427 -65 10 6.7 428 -65 30 11.7 429 -65 50 9.6 430 -65 70 11.3 431 -65 90 11.3 432 -65 110 7.1 433 -65 130 7.2 434 -65 150 7.1 435 -65 170 7.9 436 -65 190 11.4 437 -65 210 6.7 438 -65 230 12.2 439 -65 250 8.4 440 -65 270 3.7 441 -65 290 7.0 442 -65 310 6.6 443 -65 330 5.3 444 -65 350 4.1 449 -75 180 11.7 453 -75 340 7.0