Cumulus Frequency of Occurrence (%) March (1954 - 1997) , Ship Observations Only Global Average: 34.4 Zonal Averages 17 zones Lat.N Average 85 1.1 75 4.6 65 12.8 55 15.1 45 17.7 35 26.6 25 38.9 15 50.4 5 50.1 -5 52.5 -15 50.6 -25 45.6 -35 31.7 -45 18.2 -55 14.9 -65 8.4 -75 5.2 Grid Box Averages 387 filled boxes Box # Lat.N Lon.E Average 1 85 60 2.3 2 85 180 0.5 3 85 300 0.3 4 75 20 13.7 5 75 60 5.8 6 75 100 4.7 7 75 140 1.6 8 75 180 0.4 9 75 220 0.5 12 75 340 6.8 13 65 10 14.7 14 65 30 12.1 15 65 50 5.0 21 65 170 9.4 22 65 190 7.9 23 65 210 10.8 29 65 330 14.3 30 65 350 15.8 31 55 10 13.7 32 55 30 11.0 38 55 150 14.9 39 55 170 13.4 40 55 190 11.9 41 55 210 13.9 42 55 230 16.7 46 55 310 21.1 47 55 330 16.1 48 55 350 14.9 49 45 5 21.9 50 45 15 21.8 51 45 25 15.9 52 45 35 14.7 53 45 45 15.6 54 45 55 11.6 61 45 125 20.1 62 45 135 17.7 63 45 145 19.6 64 45 155 16.0 65 45 165 16.2 66 45 175 15.4 67 45 185 16.3 68 45 195 15.4 69 45 205 15.2 70 45 215 15.2 71 45 225 18.4 72 45 235 19.5 77 45 285 14.0 78 45 295 17.0 79 45 305 14.8 80 45 315 18.8 81 45 325 21.6 82 45 335 21.8 83 45 345 20.9 84 45 355 20.6 85 35 5 25.5 86 35 15 30.0 87 35 25 32.4 88 35 35 35.8 89 35 45 22.5 90 35 55 13.2 96 35 115 10.2 97 35 125 15.3 98 35 135 27.7 99 35 145 25.7 100 35 155 24.3 101 35 165 25.9 102 35 175 22.6 103 35 185 21.6 104 35 195 21.0 105 35 205 22.7 106 35 215 23.4 107 35 225 24.4 108 35 235 24.8 109 35 245 24.3 112 35 275 24.1 113 35 285 27.0 114 35 295 29.2 115 35 305 32.0 116 35 315 35.4 117 35 325 31.9 118 35 335 29.4 119 35 345 32.9 120 35 355 25.0 124 25 35 14.3 125 25 45 12.9 126 25 55 14.9 127 25 65 20.2 128 25 75 19.9 129 25 85 31.2 130 25 95 30.9 131 25 105 11.4 132 25 115 17.9 133 25 125 26.6 134 25 135 35.9 135 25 145 45.0 136 25 155 40.4 137 25 165 38.5 138 25 175 40.4 139 25 185 41.3 140 25 195 45.2 141 25 205 46.9 142 25 215 35.8 143 25 225 29.5 144 25 235 28.4 145 25 245 26.3 146 25 255 27.6 147 25 265 25.5 148 25 275 40.7 149 25 285 46.9 150 25 295 53.5 151 25 305 55.1 152 25 315 50.7 153 25 325 46.5 154 25 335 45.2 155 25 345 31.3 160 15 35 18.6 161 15 45 33.7 162 15 55 52.2 163 15 65 42.5 164 15 75 43.1 165 15 85 48.6 166 15 95 44.6 167 15 105 32.9 168 15 115 55.5 169 15 125 52.2 170 15 135 58.4 171 15 145 58.7 172 15 155 58.2 173 15 165 62.4 174 15 175 56.8 175 15 185 53.9 176 15 195 57.2 177 15 205 52.0 178 15 215 43.8 179 15 225 34.7 180 15 235 34.5 181 15 245 45.5 182 15 255 44.1 183 15 265 40.5 184 15 275 50.0 185 15 285 58.3 186 15 295 63.7 187 15 305 64.4 188 15 315 59.1 189 15 325 51.7 190 15 335 41.2 191 15 345 10.5 193 5 5 44.3 197 5 45 73.1 198 5 55 72.8 199 5 65 73.0 200 5 75 59.2 201 5 85 57.0 202 5 95 49.7 203 5 105 57.9 204 5 115 56.3 205 5 125 47.5 206 5 135 49.6 207 5 145 45.8 208 5 155 43.3 209 5 165 50.4 210 5 175 53.4 211 5 185 50.5 212 5 195 52.8 213 5 205 45.7 214 5 215 43.2 215 5 225 39.6 216 5 235 43.4 217 5 245 55.8 218 5 255 58.8 219 5 265 49.7 220 5 275 39.2 221 5 285 29.4 223 5 305 56.2 224 5 315 44.4 225 5 325 42.3 226 5 335 46.3 227 5 345 29.8 228 5 355 44.2 229 -5 5 50.8 230 -5 15 38.7 232 -5 35 60.2 233 -5 45 66.5 234 -5 55 64.3 235 -5 65 58.7 236 -5 75 53.9 237 -5 85 49.4 238 -5 95 46.3 239 -5 105 44.5 240 -5 115 44.1 241 -5 125 47.4 242 -5 135 42.9 243 -5 145 40.4 244 -5 155 40.7 245 -5 165 42.7 246 -5 175 49.0 247 -5 185 54.2 248 -5 195 56.8 249 -5 205 57.4 250 -5 215 63.7 251 -5 225 62.8 252 -5 235 59.7 253 -5 245 52.4 254 -5 255 49.2 255 -5 265 46.0 256 -5 275 32.9 257 -5 285 28.6 260 -5 315 42.6 261 -5 325 52.1 262 -5 335 55.2 263 -5 345 62.2 264 -5 355 63.1 265 -15 5 27.1 266 -15 15 18.4 268 -15 35 56.2 269 -15 45 51.7 270 -15 55 53.4 271 -15 65 55.5 272 -15 75 53.3 273 -15 85 53.0 274 -15 95 47.9 275 -15 105 53.8 276 -15 115 45.1 277 -15 125 44.4 278 -15 135 42.1 279 -15 145 42.0 280 -15 155 47.3 281 -15 165 43.3 282 -15 175 43.5 283 -15 185 44.2 284 -15 195 49.3 285 -15 205 58.3 286 -15 215 61.2 287 -15 225 61.8 288 -15 235 65.0 289 -15 245 65.0 290 -15 255 57.2 291 -15 265 45.0 292 -15 275 37.5 293 -15 285 30.8 297 -15 325 60.6 298 -15 335 62.4 299 -15 345 60.3 300 -15 355 45.2 301 -25 5 28.7 302 -25 15 25.0 304 -25 35 55.1 305 -25 45 54.3 306 -25 55 51.7 307 -25 65 48.8 308 -25 75 47.9 309 -25 85 42.2 310 -25 95 39.9 311 -25 105 38.1 312 -25 115 34.3 315 -25 145 36.9 316 -25 155 50.7 317 -25 165 47.8 318 -25 175 43.0 319 -25 185 42.8 320 -25 195 44.8 321 -25 205 46.3 322 -25 215 50.8 323 -25 225 50.9 324 -25 235 58.1 325 -25 245 54.7 326 -25 255 62.4 327 -25 265 46.9 328 -25 275 32.1 329 -25 285 21.4 332 -25 315 41.7 333 -25 325 50.6 334 -25 335 54.8 335 -25 345 48.6 336 -25 355 39.8 337 -35 5 28.4 338 -35 15 28.3 339 -35 25 29.6 340 -35 35 43.3 341 -35 45 41.5 342 -35 55 32.1 343 -35 65 30.6 344 -35 75 28.2 345 -35 85 24.5 346 -35 95 22.7 347 -35 105 24.7 348 -35 115 30.3 349 -35 125 22.9 350 -35 135 22.9 351 -35 145 25.7 352 -35 155 39.5 353 -35 165 35.9 354 -35 175 37.6 355 -35 185 35.4 356 -35 195 30.5 357 -35 205 30.2 358 -35 215 27.3 359 -35 225 30.9 360 -35 235 36.9 361 -35 245 37.4 362 -35 255 31.9 363 -35 265 29.9 364 -35 275 29.3 365 -35 285 22.4 367 -35 305 34.3 368 -35 315 41.8 369 -35 325 35.1 370 -35 335 29.1 371 -35 345 34.2 372 -35 355 32.3 373 -45 5 13.4 374 -45 15 16.3 375 -45 25 14.9 376 -45 35 13.4 377 -45 45 16.4 378 -45 55 15.5 379 -45 65 18.5 380 -45 75 16.1 381 -45 85 13.2 382 -45 95 15.6 383 -45 105 16.8 384 -45 115 19.6 385 -45 125 14.4 386 -45 135 18.1 387 -45 145 23.5 388 -45 155 25.9 389 -45 165 19.3 390 -45 175 23.0 391 -45 185 20.4 392 -45 195 17.2 393 -45 205 17.2 394 -45 215 15.0 395 -45 225 19.6 396 -45 235 16.5 397 -45 245 17.7 398 -45 255 18.8 399 -45 265 22.7 400 -45 275 20.5 401 -45 285 21.2 402 -45 295 19.9 403 -45 305 21.9 404 -45 315 21.5 405 -45 325 20.3 406 -45 335 21.3 407 -45 345 15.6 408 -45 355 18.8 409 -55 10 12.8 410 -55 30 17.0 411 -55 50 19.5 412 -55 70 12.4 413 -55 90 15.4 414 -55 110 13.5 415 -55 130 16.6 416 -55 150 18.1 417 -55 170 17.9 418 -55 190 17.7 419 -55 210 11.7 420 -55 230 11.6 421 -55 250 9.1 422 -55 270 13.0 423 -55 290 15.5 424 -55 310 14.5 425 -55 330 10.1 426 -55 350 21.5 427 -65 10 9.4 428 -65 30 10.6 429 -65 50 9.2 430 -65 70 8.9 431 -65 90 7.7 432 -65 110 13.1 433 -65 130 15.5 434 -65 150 9.2 435 -65 170 5.6 436 -65 190 5.5 437 -65 210 8.0 438 -65 230 5.5 439 -65 250 6.9 440 -65 270 8.6 441 -65 290 4.8 442 -65 310 9.0 443 -65 330 7.5 444 -65 350 9.8 449 -75 180 5.6 450 -75 220 6.0 451 -75 260 0.0 452 -75 300 6.9 453 -75 340 6.0