Cumulus Frequency of Occurrence (%) February (1954 - 1997) , Ship Observations Only Global Average: 34.1 Zonal Averages 17 zones Lat.N Average 85 1.4 75 4.4 65 12.5 55 14.9 45 17.6 35 27.1 25 39.2 15 49.7 5 48.0 -5 53.3 -15 49.5 -25 46.1 -35 32.0 -45 18.2 -55 13.4 -65 8.2 -75 7.0 Grid Box Averages 385 filled boxes Box # Lat.N Lon.E Average 1 85 60 2.6 2 85 180 0.3 3 85 300 1.6 4 75 20 10.9 5 75 60 4.9 7 75 140 2.6 8 75 180 0.2 9 75 220 0.0 12 75 340 11.3 13 65 10 12.8 14 65 30 10.4 15 65 50 8.2 21 65 170 8.8 22 65 190 7.3 23 65 210 9.9 29 65 330 13.4 30 65 350 16.8 31 55 10 14.5 32 55 30 10.6 38 55 150 13.9 39 55 170 13.3 40 55 190 13.0 41 55 210 12.8 42 55 230 13.8 46 55 310 20.3 47 55 330 17.0 48 55 350 14.8 49 45 5 24.1 50 45 15 20.5 51 45 25 14.2 52 45 35 14.3 53 45 45 9.3 54 45 55 13.0 61 45 125 19.4 62 45 135 21.1 63 45 145 23.9 64 45 155 16.5 65 45 165 15.8 66 45 175 16.1 67 45 185 16.9 68 45 195 16.8 69 45 205 15.6 70 45 215 14.9 71 45 225 14.6 72 45 235 15.2 77 45 285 17.8 78 45 295 18.6 79 45 305 14.5 80 45 315 17.6 81 45 325 20.1 82 45 335 21.8 83 45 345 20.4 84 45 355 20.1 85 35 5 26.6 86 35 15 31.2 87 35 25 35.0 88 35 35 38.1 90 35 55 20.1 96 35 115 8.9 97 35 125 20.4 98 35 135 34.8 99 35 145 28.5 100 35 155 23.7 101 35 165 28.0 102 35 175 25.6 103 35 185 24.1 104 35 195 24.0 105 35 205 22.7 106 35 215 22.4 107 35 225 23.8 108 35 235 21.8 109 35 245 18.4 112 35 275 22.0 113 35 285 26.6 114 35 295 26.6 115 35 305 29.8 116 35 315 33.3 117 35 325 30.6 118 35 335 29.5 119 35 345 31.4 120 35 355 25.3 124 25 35 26.7 125 25 45 15.6 126 25 55 20.5 127 25 65 25.2 128 25 75 12.9 129 25 85 25.8 130 25 95 17.4 131 25 105 8.5 132 25 115 18.0 133 25 125 27.8 134 25 135 36.5 135 25 145 44.0 136 25 155 42.7 137 25 165 42.7 138 25 175 41.8 139 25 185 42.7 140 25 195 46.1 141 25 205 45.4 142 25 215 37.5 143 25 225 30.9 144 25 235 28.0 145 25 245 26.0 146 25 255 29.9 147 25 265 26.3 148 25 275 40.4 149 25 285 46.3 150 25 295 51.5 151 25 305 51.8 152 25 315 48.3 153 25 325 46.2 154 25 335 44.4 155 25 345 26.3 160 15 35 31.7 161 15 45 37.0 162 15 55 52.4 163 15 65 49.2 164 15 75 38.0 165 15 85 49.0 166 15 95 30.6 167 15 105 31.1 168 15 115 53.0 169 15 125 47.3 170 15 135 53.0 171 15 145 53.8 172 15 155 59.2 173 15 165 60.1 174 15 175 56.4 175 15 185 55.2 176 15 195 58.4 177 15 205 54.7 178 15 215 46.5 179 15 225 39.4 180 15 235 34.5 181 15 245 48.0 182 15 255 46.1 183 15 265 38.1 184 15 275 47.9 185 15 285 57.4 186 15 295 63.0 187 15 305 61.3 188 15 315 57.8 189 15 325 51.4 190 15 335 37.3 191 15 345 9.5 193 5 5 45.1 197 5 45 68.3 198 5 55 67.0 199 5 65 71.8 200 5 75 52.5 201 5 85 56.2 202 5 95 51.0 203 5 105 50.4 204 5 115 48.2 205 5 125 43.9 206 5 135 48.7 207 5 145 43.2 208 5 155 45.4 209 5 165 55.4 210 5 175 47.5 211 5 185 48.9 212 5 195 50.1 213 5 205 45.0 214 5 215 44.3 215 5 225 39.9 216 5 235 35.6 217 5 245 50.2 218 5 255 52.4 219 5 265 48.4 220 5 275 41.4 221 5 285 32.2 223 5 305 54.4 224 5 315 40.1 225 5 325 44.0 226 5 335 43.6 227 5 345 30.3 228 5 355 43.7 229 -5 5 50.5 230 -5 15 39.7 232 -5 35 56.9 233 -5 45 66.0 234 -5 55 60.0 235 -5 65 51.7 236 -5 75 48.0 237 -5 85 49.0 238 -5 95 43.1 239 -5 105 40.3 240 -5 115 34.8 241 -5 125 43.2 242 -5 135 42.3 243 -5 145 39.6 244 -5 155 40.9 245 -5 165 44.2 246 -5 175 45.4 247 -5 185 54.3 248 -5 195 58.0 249 -5 205 66.0 250 -5 215 66.4 251 -5 225 67.9 252 -5 235 69.3 253 -5 245 60.9 254 -5 255 55.4 255 -5 265 46.4 256 -5 275 33.7 257 -5 285 21.8 260 -5 315 36.5 261 -5 325 59.6 262 -5 335 59.8 263 -5 345 64.9 264 -5 355 64.0 265 -15 5 32.3 266 -15 15 19.3 268 -15 35 49.1 269 -15 45 47.0 270 -15 55 51.0 271 -15 65 48.8 272 -15 75 43.0 273 -15 85 51.0 274 -15 95 48.9 275 -15 105 48.5 276 -15 115 46.7 277 -15 125 45.4 278 -15 135 44.3 279 -15 145 39.8 280 -15 155 45.5 281 -15 165 45.8 282 -15 175 43.0 283 -15 185 43.2 284 -15 195 43.8 285 -15 205 47.8 286 -15 215 55.4 287 -15 225 63.9 288 -15 235 66.6 289 -15 245 65.5 290 -15 255 57.8 291 -15 265 44.5 292 -15 275 43.4 293 -15 285 32.9 297 -15 325 62.6 298 -15 335 63.2 299 -15 345 59.0 300 -15 355 46.6 301 -25 5 29.8 302 -25 15 24.5 304 -25 35 52.8 305 -25 45 49.5 306 -25 55 51.8 307 -25 65 49.3 308 -25 75 52.5 309 -25 85 46.3 310 -25 95 37.3 311 -25 105 32.4 312 -25 115 29.8 315 -25 145 49.0 316 -25 155 49.9 317 -25 165 48.6 318 -25 175 43.9 319 -25 185 43.9 320 -25 195 44.0 321 -25 205 41.7 322 -25 215 52.5 323 -25 225 55.2 324 -25 235 59.0 325 -25 245 59.1 326 -25 255 55.5 327 -25 265 46.5 328 -25 275 35.2 329 -25 285 23.4 332 -25 315 41.6 333 -25 325 57.1 334 -25 335 55.4 335 -25 345 52.9 336 -25 355 42.7 337 -35 5 31.4 338 -35 15 31.1 339 -35 25 30.0 340 -35 35 37.5 341 -35 45 36.2 342 -35 55 29.9 343 -35 65 32.8 344 -35 75 28.1 345 -35 85 27.4 346 -35 95 23.5 347 -35 105 24.3 348 -35 115 29.4 349 -35 125 24.5 350 -35 135 25.4 351 -35 145 28.6 352 -35 155 38.4 353 -35 165 36.0 354 -35 175 36.4 355 -35 185 37.0 356 -35 195 31.9 357 -35 205 30.1 358 -35 215 28.5 359 -35 225 30.8 360 -35 235 35.4 361 -35 245 45.9 362 -35 255 35.5 363 -35 265 26.6 364 -35 275 26.6 365 -35 285 26.1 367 -35 305 33.0 368 -35 315 40.3 369 -35 325 29.2 370 -35 335 33.5 371 -35 345 35.7 372 -35 355 34.3 373 -45 5 13.6 374 -45 15 12.5 375 -45 25 18.2 376 -45 35 12.9 377 -45 45 15.4 378 -45 55 20.7 379 -45 65 18.3 380 -45 75 17.6 381 -45 85 16.8 382 -45 95 16.5 383 -45 105 15.0 384 -45 115 17.8 385 -45 125 15.0 386 -45 135 22.7 387 -45 145 22.4 388 -45 155 25.1 389 -45 165 22.4 390 -45 175 22.2 391 -45 185 22.8 392 -45 195 24.5 393 -45 205 16.7 394 -45 215 14.7 395 -45 225 24.6 396 -45 235 18.1 397 -45 245 15.7 398 -45 255 18.6 399 -45 265 17.8 400 -45 275 23.1 401 -45 285 22.0 402 -45 295 19.5 403 -45 305 17.9 404 -45 315 20.6 405 -45 325 16.2 406 -45 335 11.5 407 -45 345 18.8 408 -45 355 12.1 409 -55 10 11.9 410 -55 30 12.8 411 -55 50 10.0 412 -55 70 14.4 413 -55 90 13.4 414 -55 110 12.2 415 -55 130 14.3 416 -55 150 13.1 417 -55 170 16.5 418 -55 190 13.6 419 -55 210 15.3 420 -55 230 9.0 421 -55 250 9.8 422 -55 270 17.2 423 -55 290 16.1 424 -55 310 14.7 425 -55 330 10.1 426 -55 350 16.7 427 -65 10 8.9 428 -65 30 7.1 429 -65 50 9.3 430 -65 70 12.0 431 -65 90 7.5 432 -65 110 8.6 433 -65 130 5.5 434 -65 150 6.0 435 -65 170 8.8 436 -65 190 6.3 437 -65 210 10.0 438 -65 230 10.7 439 -65 250 13.1 440 -65 270 7.3 441 -65 290 6.4 442 -65 310 6.7 443 -65 330 5.0 444 -65 350 8.1 449 -75 180 11.6 450 -75 220 2.5 451 -75 260 2.9 452 -75 300 8.5 453 -75 340 7.7