Cumulus Frequency of Occurrence (%) March (1954 - 1997) Day, Ship Observations Only Global Average: 36.2 Zonal Averages 17 zones Lat.N Average 85 1.6 75 5.2 65 14.4 55 15.9 45 18.9 35 28.1 25 41.0 15 52.3 5 51.8 -5 54.9 -15 53.3 -25 48.3 -35 33.8 -45 19.9 -55 15.6 -65 9.1 -75 5.6 Grid Box Averages 385 filled boxes Box # Lat.N Lon.E Average 1 85 60 3.3 2 85 180 0.6 3 85 300 0.6 4 75 20 14.4 5 75 60 7.8 6 75 100 5.6 7 75 140 2.1 8 75 180 0.3 9 75 220 0.3 12 75 340 7.6 13 65 10 15.6 14 65 30 13.2 15 65 50 5.8 21 65 170 10.7 22 65 190 10.0 23 65 210 9.9 29 65 330 16.3 30 65 350 17.7 31 55 10 14.5 32 55 30 11.1 38 55 150 16.7 39 55 170 14.4 40 55 190 13.2 41 55 210 14.4 42 55 230 18.1 46 55 310 19.4 47 55 330 16.9 48 55 350 16.3 49 45 5 24.2 50 45 15 23.8 51 45 25 15.5 52 45 35 14.8 53 45 45 14.4 54 45 55 14.5 62 45 135 19.1 63 45 145 21.6 64 45 155 17.6 65 45 165 16.9 66 45 175 17.1 67 45 185 17.4 68 45 195 16.8 69 45 205 15.3 70 45 215 15.6 71 45 225 19.1 72 45 235 21.5 77 45 285 14.0 78 45 295 18.2 79 45 305 16.4 80 45 315 19.3 81 45 325 22.6 82 45 335 22.9 83 45 345 22.9 84 45 355 22.8 85 35 5 26.9 86 35 15 32.4 87 35 25 35.1 88 35 35 37.2 89 35 45 24.7 90 35 55 18.3 96 35 115 10.6 97 35 125 15.9 98 35 135 29.0 99 35 145 27.1 100 35 155 25.9 101 35 165 26.6 102 35 175 25.1 103 35 185 23.1 104 35 195 22.5 105 35 205 23.4 106 35 215 24.3 107 35 225 25.8 108 35 235 25.8 109 35 245 26.2 112 35 275 25.5 113 35 285 28.6 114 35 295 30.6 115 35 305 32.6 116 35 315 36.2 117 35 325 33.5 118 35 335 31.1 119 35 345 35.2 120 35 355 27.5 124 25 35 17.7 125 25 45 13.8 126 25 55 16.5 127 25 65 22.0 128 25 75 22.1 129 25 85 27.8 130 25 95 31.3 131 25 105 15.3 132 25 115 18.6 133 25 125 28.0 134 25 135 38.3 135 25 145 46.7 136 25 155 43.6 137 25 165 41.3 138 25 175 43.4 139 25 185 44.9 140 25 195 46.7 141 25 205 47.6 142 25 215 38.5 143 25 225 32.6 144 25 235 29.7 145 25 245 29.7 146 25 255 32.2 147 25 265 25.4 148 25 275 41.1 149 25 285 49.8 150 25 295 54.9 151 25 305 56.1 152 25 315 53.2 153 25 325 49.2 154 25 335 47.5 155 25 345 32.6 160 15 35 20.5 161 15 45 36.9 162 15 55 55.1 163 15 65 43.7 164 15 75 43.2 165 15 85 50.3 166 15 95 44.4 167 15 105 34.4 168 15 115 58.0 169 15 125 55.4 170 15 135 60.0 171 15 145 60.2 172 15 155 59.1 173 15 165 65.8 174 15 175 59.3 175 15 185 55.3 176 15 195 58.3 177 15 205 52.9 178 15 215 47.1 179 15 225 39.6 180 15 235 37.5 181 15 245 48.1 182 15 255 47.9 183 15 265 43.3 184 15 275 49.5 185 15 285 60.6 186 15 295 65.7 187 15 305 65.2 188 15 315 59.6 189 15 325 53.7 190 15 335 43.6 191 15 345 11.1 193 5 5 45.4 197 5 45 75.5 198 5 55 75.3 199 5 65 74.2 200 5 75 62.8 201 5 85 58.7 202 5 95 51.1 203 5 105 60.7 204 5 115 57.9 205 5 125 49.2 206 5 135 52.2 207 5 145 47.0 208 5 155 47.2 209 5 165 50.3 210 5 175 51.2 211 5 185 50.9 212 5 195 51.9 213 5 205 47.4 214 5 215 45.5 215 5 225 41.9 216 5 235 44.4 217 5 245 55.8 218 5 255 60.2 219 5 265 55.3 220 5 275 40.8 221 5 285 30.0 223 5 305 56.1 224 5 315 45.1 225 5 325 45.0 226 5 335 47.7 227 5 345 33.0 228 5 355 47.6 229 -5 5 54.3 230 -5 15 39.6 232 -5 35 62.8 233 -5 45 68.8 234 -5 55 63.7 235 -5 65 59.0 236 -5 75 55.8 237 -5 85 51.6 238 -5 95 49.4 239 -5 105 44.2 240 -5 115 45.0 241 -5 125 48.7 242 -5 135 44.8 243 -5 145 42.2 244 -5 155 42.9 245 -5 165 44.1 246 -5 175 52.8 247 -5 185 56.8 248 -5 195 59.4 249 -5 205 59.1 250 -5 215 62.4 251 -5 225 64.3 252 -5 235 63.5 253 -5 245 57.9 254 -5 255 53.9 255 -5 265 50.2 256 -5 275 35.7 257 -5 285 32.2 260 -5 315 42.9 261 -5 325 54.3 262 -5 335 58.3 263 -5 345 65.8 264 -5 355 67.2 265 -15 5 34.0 266 -15 15 20.0 268 -15 35 59.5 269 -15 45 52.4 270 -15 55 55.5 271 -15 65 56.0 272 -15 75 54.3 273 -15 85 56.3 274 -15 95 48.9 275 -15 105 56.3 276 -15 115 47.5 277 -15 125 51.3 278 -15 135 46.6 279 -15 145 45.0 280 -15 155 49.8 281 -15 165 46.3 282 -15 175 43.6 283 -15 185 45.3 284 -15 195 51.1 285 -15 205 55.9 286 -15 215 59.1 287 -15 225 64.0 288 -15 235 67.9 289 -15 245 66.3 290 -15 255 63.1 291 -15 265 53.5 292 -15 275 42.4 293 -15 285 33.0 297 -15 325 62.0 298 -15 335 65.0 299 -15 345 63.6 300 -15 355 52.4 301 -25 5 35.8 302 -25 15 25.9 304 -25 35 56.7 305 -25 45 56.2 306 -25 55 52.2 307 -25 65 52.4 308 -25 75 51.3 309 -25 85 47.9 310 -25 95 42.9 311 -25 105 39.3 312 -25 115 36.0 315 -25 145 46.3 316 -25 155 53.6 317 -25 165 50.6 318 -25 175 46.9 319 -25 185 44.5 320 -25 195 46.7 321 -25 205 48.9 322 -25 215 50.3 323 -25 225 54.4 324 -25 235 59.0 325 -25 245 59.5 326 -25 255 60.9 327 -25 265 53.7 328 -25 275 37.6 329 -25 285 21.9 332 -25 315 44.6 333 -25 325 52.1 334 -25 335 53.9 335 -25 345 51.6 336 -25 355 45.0 337 -35 5 32.8 338 -35 15 30.6 339 -35 25 32.6 340 -35 35 45.2 341 -35 45 40.7 342 -35 55 35.6 343 -35 65 33.2 344 -35 75 30.9 345 -35 85 29.6 346 -35 95 27.0 347 -35 105 25.3 348 -35 115 31.1 349 -35 125 25.1 350 -35 135 25.3 351 -35 145 28.2 352 -35 155 41.7 353 -35 165 37.8 354 -35 175 40.9 355 -35 185 38.9 356 -35 195 31.8 357 -35 205 32.6 358 -35 215 29.1 359 -35 225 35.0 360 -35 235 37.9 361 -35 245 38.9 362 -35 255 31.6 363 -35 265 28.8 364 -35 275 31.0 365 -35 285 20.7 367 -35 305 37.8 368 -35 315 43.3 369 -35 325 35.2 370 -35 335 34.6 371 -35 345 35.6 372 -35 355 35.5 373 -45 5 15.1 374 -45 15 17.7 375 -45 25 18.4 376 -45 35 14.3 377 -45 45 16.1 378 -45 55 19.4 379 -45 65 22.5 380 -45 75 17.8 381 -45 85 17.4 382 -45 95 20.5 383 -45 105 14.8 384 -45 115 19.8 385 -45 125 15.5 386 -45 135 20.3 387 -45 145 27.1 388 -45 155 27.5 389 -45 165 20.6 390 -45 175 27.0 391 -45 185 23.5 392 -45 195 20.5 393 -45 205 20.2 394 -45 215 22.3 395 -45 225 17.5 396 -45 235 14.7 397 -45 245 19.2 398 -45 255 19.5 399 -45 265 23.5 400 -45 275 20.2 401 -45 285 18.1 402 -45 295 21.1 403 -45 305 23.9 404 -45 315 23.0 405 -45 325 17.4 406 -45 335 22.2 407 -45 345 20.1 408 -45 355 17.8 409 -55 10 13.6 410 -55 30 19.7 411 -55 50 19.2 412 -55 70 12.9 413 -55 90 17.5 414 -55 110 15.6 415 -55 130 13.8 416 -55 150 18.3 417 -55 170 18.5 418 -55 190 17.9 419 -55 210 12.3 420 -55 230 10.6 421 -55 250 10.4 422 -55 270 12.7 423 -55 290 18.1 424 -55 310 15.7 425 -55 330 13.0 426 -55 350 21.9 427 -65 10 10.7 428 -65 30 10.1 429 -65 50 10.2 430 -65 70 10.4 431 -65 90 8.2 432 -65 110 15.6 433 -65 130 20.5 434 -65 150 10.4 435 -65 170 6.2 436 -65 190 5.7 437 -65 210 6.8 438 -65 230 6.8 439 -65 250 7.8 440 -65 270 8.0 441 -65 290 5.3 442 -65 310 9.6 443 -65 330 7.0 444 -65 350 10.3 449 -75 180 8.0 450 -75 220 6.7 451 -75 260 0.0 453 -75 340 5.1