Cumulus Frequency of Occurrence (%) January (1954 - 1997) Day, Ship Observations Only Global Average: 35.2 Zonal Averages 17 zones Lat.N Average 85 0.5 75 5.0 65 11.1 55 14.0 45 17.2 35 28.3 25 40.8 15 50.9 5 47.4 -5 53.9 -15 49.9 -25 48.5 -35 35.7 -45 21.3 -55 14.0 -65 8.2 -75 10.7 Grid Box Averages 380 filled boxes Box # Lat.N Lon.E Average 2 85 180 0.5 4 75 20 10.7 5 75 60 5.0 8 75 180 0.3 9 75 220 0.0 12 75 340 13.0 13 65 10 12.3 14 65 30 11.9 15 65 50 11.2 21 65 170 8.7 22 65 190 5.4 23 65 210 8.3 29 65 330 11.1 30 65 350 14.4 31 55 10 14.1 32 55 30 9.8 38 55 150 13.9 39 55 170 13.1 40 55 190 13.1 41 55 210 11.2 42 55 230 13.2 46 55 310 17.9 47 55 330 15.0 48 55 350 14.3 49 45 5 27.3 50 45 15 25.9 51 45 25 14.9 52 45 35 13.9 53 45 45 14.2 54 45 55 16.1 62 45 135 20.8 63 45 145 22.4 64 45 155 15.1 65 45 165 15.3 66 45 175 16.6 67 45 185 17.7 68 45 195 16.8 69 45 205 14.2 70 45 215 13.4 71 45 225 14.4 72 45 235 16.0 77 45 285 19.2 78 45 295 19.0 79 45 305 14.7 80 45 315 17.0 81 45 325 19.1 82 45 335 19.3 83 45 345 19.2 84 45 355 20.0 85 35 5 33.4 86 35 15 35.4 87 35 25 37.1 88 35 35 41.9 90 35 55 21.8 96 35 115 8.1 97 35 125 23.3 98 35 135 35.0 99 35 145 31.3 100 35 155 26.0 101 35 165 29.1 102 35 175 26.3 103 35 185 26.9 104 35 195 23.8 105 35 205 22.4 106 35 215 21.2 107 35 225 22.3 108 35 235 21.7 109 35 245 21.2 112 35 275 23.3 113 35 285 28.1 114 35 295 26.8 115 35 305 30.7 116 35 315 34.4 117 35 325 32.0 118 35 335 30.1 119 35 345 33.0 120 35 355 29.5 124 25 35 42.5 125 25 45 24.5 126 25 55 36.2 127 25 65 39.6 128 25 75 14.2 129 25 85 16.3 130 25 95 19.4 131 25 105 14.1 132 25 115 21.8 133 25 125 27.8 134 25 135 39.4 135 25 145 45.3 136 25 155 42.8 137 25 165 42.5 138 25 175 42.9 139 25 185 44.3 140 25 195 41.7 141 25 205 43.7 142 25 215 36.4 143 25 225 30.0 144 25 235 30.3 145 25 245 30.8 146 25 255 37.3 147 25 265 29.1 148 25 275 42.5 149 25 285 47.8 150 25 295 52.6 151 25 305 54.3 152 25 315 51.0 153 25 325 49.0 154 25 335 46.3 155 25 345 27.0 160 15 35 47.8 161 15 45 48.1 162 15 55 61.1 163 15 65 57.0 164 15 75 36.4 165 15 85 54.3 166 15 95 44.1 167 15 105 36.3 168 15 115 48.4 169 15 125 42.5 170 15 135 47.7 171 15 145 54.5 172 15 155 58.9 173 15 165 61.8 174 15 175 58.3 175 15 185 55.7 176 15 195 55.2 177 15 205 51.9 178 15 215 44.6 179 15 225 41.6 180 15 235 38.7 181 15 245 47.8 182 15 255 51.0 183 15 265 41.6 184 15 275 44.2 185 15 285 59.8 186 15 295 63.6 187 15 305 62.4 188 15 315 59.0 189 15 325 51.9 190 15 335 38.7 191 15 345 10.4 193 5 5 39.9 197 5 45 68.0 198 5 55 67.2 199 5 65 66.0 200 5 75 53.1 201 5 85 52.0 202 5 95 50.8 203 5 105 43.6 204 5 115 46.0 205 5 125 45.5 206 5 135 45.1 207 5 145 45.3 208 5 155 48.5 209 5 165 48.1 210 5 175 49.7 211 5 185 49.6 212 5 195 52.6 213 5 205 44.6 214 5 215 42.3 215 5 225 43.2 216 5 235 43.8 217 5 245 42.8 218 5 255 48.5 219 5 265 45.9 220 5 275 43.6 221 5 285 39.2 223 5 305 53.1 224 5 315 41.4 225 5 325 44.3 226 5 335 44.3 227 5 345 32.1 228 5 355 41.0 229 -5 5 47.8 230 -5 15 37.0 232 -5 35 50.4 233 -5 45 65.7 234 -5 55 54.8 235 -5 65 52.1 236 -5 75 46.3 237 -5 85 48.1 238 -5 95 40.4 239 -5 105 38.8 240 -5 115 36.7 241 -5 125 44.5 242 -5 135 40.9 243 -5 145 41.9 244 -5 155 44.3 245 -5 165 45.4 246 -5 175 44.6 247 -5 185 56.3 248 -5 195 61.4 249 -5 205 69.4 250 -5 215 68.2 251 -5 225 73.7 252 -5 235 72.0 253 -5 245 63.5 254 -5 255 53.5 255 -5 265 52.9 256 -5 275 36.2 257 -5 285 22.8 260 -5 315 51.8 261 -5 325 65.4 262 -5 335 61.5 263 -5 345 58.9 264 -5 355 58.3 265 -15 5 33.9 266 -15 15 20.4 268 -15 35 54.2 269 -15 45 48.3 270 -15 55 54.9 271 -15 65 52.1 272 -15 75 53.8 273 -15 85 58.4 274 -15 95 50.0 275 -15 105 47.7 276 -15 115 42.4 277 -15 125 44.5 278 -15 135 43.0 279 -15 145 45.5 280 -15 155 52.1 281 -15 165 50.2 282 -15 175 47.2 283 -15 185 45.3 284 -15 195 45.2 285 -15 205 49.0 286 -15 215 52.4 287 -15 225 63.5 288 -15 235 64.3 289 -15 245 61.5 290 -15 255 53.2 291 -15 265 45.8 292 -15 275 39.9 293 -15 285 27.8 297 -15 325 62.4 298 -15 335 58.8 299 -15 345 51.1 300 -15 355 41.6 301 -25 5 38.7 302 -25 15 26.3 304 -25 35 53.7 305 -25 45 53.1 306 -25 55 54.9 307 -25 65 57.6 308 -25 75 60.5 309 -25 85 55.1 310 -25 95 44.3 311 -25 105 33.3 312 -25 115 33.7 315 -25 145 53.0 316 -25 155 53.0 317 -25 165 54.4 318 -25 175 49.6 319 -25 185 50.1 320 -25 195 44.9 321 -25 205 41.8 322 -25 215 43.7 323 -25 225 51.7 324 -25 235 58.6 325 -25 245 59.2 326 -25 255 54.8 327 -25 265 45.7 328 -25 275 36.6 329 -25 285 23.2 332 -25 315 40.2 333 -25 325 47.6 334 -25 335 55.0 335 -25 345 62.0 336 -25 355 50.3 337 -35 5 40.4 338 -35 15 35.1 339 -35 25 35.9 340 -35 35 38.6 341 -35 45 38.9 342 -35 55 35.8 343 -35 65 34.4 344 -35 75 36.1 345 -35 85 36.7 346 -35 95 33.4 347 -35 105 27.9 348 -35 115 31.9 349 -35 125 28.2 350 -35 135 29.3 351 -35 145 29.8 352 -35 155 39.1 353 -35 165 40.9 354 -35 175 40.8 355 -35 185 46.6 356 -35 195 36.8 357 -35 205 35.8 358 -35 215 34.5 359 -35 225 32.2 360 -35 235 36.9 361 -35 245 37.8 362 -35 255 33.5 363 -35 265 31.3 364 -35 275 31.9 365 -35 285 28.1 367 -35 305 35.0 368 -35 315 42.5 369 -35 325 34.4 370 -35 335 32.9 371 -35 345 37.2 372 -35 355 36.4 373 -45 5 18.3 374 -45 15 17.3 375 -45 25 19.1 376 -45 35 15.4 377 -45 45 20.6 378 -45 55 17.8 379 -45 65 20.1 380 -45 75 25.0 381 -45 85 20.2 382 -45 95 19.5 383 -45 105 18.0 384 -45 115 21.4 385 -45 125 20.4 386 -45 135 19.1 387 -45 145 27.8 388 -45 155 25.5 389 -45 165 23.5 390 -45 175 28.5 391 -45 185 26.8 392 -45 195 21.0 393 -45 205 21.4 394 -45 215 16.1 395 -45 225 25.6 396 -45 235 15.9 397 -45 245 16.7 398 -45 255 19.1 399 -45 265 29.3 400 -45 275 26.2 401 -45 285 20.6 402 -45 295 21.8 403 -45 305 20.8 404 -45 315 28.3 405 -45 325 21.9 406 -45 335 18.4 407 -45 345 20.4 408 -45 355 18.8 409 -55 10 12.7 410 -55 30 15.9 411 -55 50 13.9 412 -55 70 12.7 413 -55 90 14.1 414 -55 110 15.9 415 -55 130 16.6 416 -55 150 11.4 417 -55 170 15.6 418 -55 190 9.5 419 -55 210 9.1 420 -55 230 10.6 421 -55 250 19.6 422 -55 270 15.8 423 -55 290 19.5 424 -55 310 15.7 425 -55 330 12.2 426 -55 350 12.4 427 -65 10 14.1 428 -65 30 9.8 429 -65 50 9.7 430 -65 70 15.0 431 -65 90 8.3 432 -65 110 5.4 433 -65 130 6.8 434 -65 150 7.0 435 -65 170 8.4 436 -65 190 7.8 437 -65 210 4.4 438 -65 230 5.5 439 -65 250 7.8 440 -65 270 9.1 441 -65 290 8.1 442 -65 310 6.8 443 -65 330 5.1 444 -65 350 8.6 449 -75 180 17.4 450 -75 220 6.9 452 -75 300 8.1 453 -75 340 7.4