Cumulus Frequency of Occurrence (%) May (1954 - 1997) , Ship Observations Only Global Average: 33.7 Zonal Averages 16 zones Lat.N Average 85 2.1 75 5.4 65 14.1 55 12.0 45 13.7 35 25.3 25 43.4 15 50.5 5 45.1 -5 55.2 -15 49.9 -25 42.0 -35 30.0 -45 18.9 -55 13.7 -65 5.6 Grid Box Averages 367 filled boxes Box # Lat.N Lon.E Average 1 85 60 4.9 2 85 180 0.6 3 85 300 0.4 4 75 20 11.8 5 75 60 6.8 6 75 100 3.6 7 75 140 1.7 8 75 180 1.1 9 75 220 0.5 10 75 260 14.3 11 75 300 8.3 12 75 340 7.8 13 65 10 14.0 14 65 30 11.4 15 65 50 11.9 20 65 150 14.8 21 65 170 9.4 22 65 190 6.4 23 65 210 16.7 27 65 290 23.5 29 65 330 14.6 30 65 350 15.4 31 55 10 14.0 32 55 30 11.4 37 55 130 9.4 38 55 150 8.3 39 55 170 7.4 40 55 190 8.7 41 55 210 12.2 42 55 230 16.5 45 55 290 32.8 46 55 310 10.7 47 55 330 14.6 48 55 350 16.6 49 45 5 20.8 50 45 15 21.6 51 45 25 16.8 52 45 35 14.4 53 45 45 12.5 54 45 55 12.6 62 45 135 9.5 63 45 145 9.5 64 45 155 6.7 65 45 165 5.5 66 45 175 6.7 67 45 185 8.6 68 45 195 10.3 69 45 205 11.8 70 45 215 12.2 71 45 225 15.5 72 45 235 20.5 77 45 285 8.6 78 45 295 10.4 79 45 305 11.0 80 45 315 15.4 81 45 325 22.1 82 45 335 21.6 83 45 345 23.6 84 45 355 24.6 85 35 5 20.6 86 35 15 18.8 87 35 25 21.1 88 35 35 29.3 89 35 45 19.8 90 35 55 17.1 96 35 115 9.4 97 35 125 9.7 98 35 135 22.1 99 35 145 21.0 100 35 155 17.6 101 35 165 17.2 102 35 175 20.0 103 35 185 20.0 104 35 195 20.3 105 35 205 20.9 106 35 215 22.5 107 35 225 22.8 108 35 235 20.8 109 35 245 16.3 112 35 275 31.9 113 35 285 29.5 114 35 295 34.9 115 35 305 36.8 116 35 315 41.1 117 35 325 39.1 118 35 335 33.1 119 35 345 35.1 120 35 355 25.9 124 25 35 7.1 125 25 45 5.6 126 25 55 7.7 127 25 65 35.7 128 25 75 40.6 129 25 85 37.8 130 25 95 41.4 131 25 105 31.4 132 25 115 33.0 133 25 125 32.5 134 25 135 35.9 135 25 145 45.5 136 25 155 45.5 137 25 165 48.2 138 25 175 48.9 139 25 185 51.2 140 25 195 54.9 141 25 205 53.3 142 25 215 41.4 143 25 225 26.4 144 25 235 21.1 145 25 245 22.9 146 25 255 29.4 147 25 265 42.6 148 25 275 50.1 149 25 285 49.2 150 25 295 53.0 151 25 305 56.9 152 25 315 57.7 153 25 325 54.4 154 25 335 48.1 155 25 345 31.1 160 15 35 12.6 161 15 45 26.9 162 15 55 51.9 163 15 65 63.3 164 15 75 58.3 165 15 85 47.8 166 15 95 51.0 167 15 105 39.1 168 15 115 58.3 169 15 125 55.2 170 15 135 61.5 171 15 145 62.4 172 15 155 61.8 173 15 165 66.9 174 15 175 59.8 175 15 185 55.3 176 15 195 54.4 177 15 205 55.1 178 15 215 41.6 179 15 225 32.9 180 15 235 24.0 181 15 245 35.7 182 15 255 43.0 183 15 265 39.6 184 15 275 47.9 185 15 285 51.3 186 15 295 56.6 187 15 305 61.0 188 15 315 56.0 189 15 325 46.3 190 15 335 42.2 191 15 345 13.6 193 5 5 39.1 197 5 45 61.4 198 5 55 58.9 199 5 65 59.7 200 5 75 49.7 201 5 85 46.4 202 5 95 41.1 203 5 105 53.4 204 5 115 51.8 205 5 125 47.0 206 5 135 47.6 207 5 145 41.5 208 5 155 43.5 209 5 165 45.5 210 5 175 41.5 211 5 185 49.6 212 5 195 45.3 213 5 205 46.4 214 5 215 45.9 215 5 225 43.3 216 5 235 48.3 217 5 245 38.4 218 5 255 42.7 219 5 265 38.7 220 5 275 32.1 221 5 285 30.8 223 5 305 47.1 224 5 315 41.6 225 5 325 44.4 226 5 335 42.9 227 5 345 36.0 228 5 355 40.5 229 -5 5 45.3 230 -5 15 29.3 232 -5 35 44.6 233 -5 45 56.8 234 -5 55 61.4 235 -5 65 60.5 236 -5 75 54.5 237 -5 85 52.6 238 -5 95 49.5 239 -5 105 50.9 240 -5 115 53.4 241 -5 125 50.9 242 -5 135 52.2 243 -5 145 44.1 244 -5 155 40.6 245 -5 165 53.8 246 -5 175 53.9 247 -5 185 58.4 248 -5 195 59.7 249 -5 205 65.7 250 -5 215 67.9 251 -5 225 64.3 252 -5 235 67.0 253 -5 245 67.9 254 -5 255 56.9 255 -5 265 46.4 256 -5 275 27.5 257 -5 285 17.8 260 -5 315 48.0 261 -5 325 51.4 262 -5 335 61.3 263 -5 345 64.5 264 -5 355 54.2 265 -15 5 29.4 266 -15 15 16.2 268 -15 35 61.7 269 -15 45 60.6 270 -15 55 56.8 271 -15 65 54.6 272 -15 75 57.2 273 -15 85 48.9 274 -15 95 45.8 275 -15 105 56.2 276 -15 115 45.1 277 -15 125 42.8 278 -15 135 57.5 279 -15 145 47.1 280 -15 155 49.6 281 -15 165 45.0 282 -15 175 47.3 283 -15 185 47.5 284 -15 195 47.5 285 -15 205 55.8 286 -15 215 62.1 287 -15 225 62.6 288 -15 235 64.4 289 -15 245 62.2 290 -15 255 55.7 291 -15 265 38.7 292 -15 275 24.9 293 -15 285 14.7 297 -15 325 58.4 298 -15 335 62.2 299 -15 345 56.3 300 -15 355 37.7 301 -25 5 31.3 302 -25 15 23.7 304 -25 35 53.1 305 -25 45 51.9 306 -25 55 52.9 307 -25 65 48.3 308 -25 75 43.1 309 -25 85 40.4 310 -25 95 42.3 311 -25 105 43.4 312 -25 115 34.3 315 -25 145 49.0 316 -25 155 48.0 317 -25 165 49.0 318 -25 175 43.5 319 -25 185 42.0 320 -25 195 40.9 321 -25 205 42.0 322 -25 215 39.9 323 -25 225 44.3 324 -25 235 51.4 325 -25 245 51.4 326 -25 255 44.0 327 -25 265 32.3 328 -25 275 30.8 329 -25 285 19.7 332 -25 315 39.0 333 -25 325 48.0 334 -25 335 42.0 335 -25 345 41.8 336 -25 355 37.7 337 -35 5 27.9 338 -35 15 27.4 339 -35 25 25.6 340 -35 35 39.6 341 -35 45 36.3 342 -35 55 32.3 343 -35 65 27.6 344 -35 75 25.9 345 -35 85 21.7 346 -35 95 21.2 347 -35 105 26.7 348 -35 115 29.3 349 -35 125 25.9 350 -35 135 25.1 351 -35 145 25.0 352 -35 155 35.3 353 -35 165 31.6 354 -35 175 34.6 355 -35 185 33.9 356 -35 195 32.5 357 -35 205 32.2 358 -35 215 28.6 359 -35 225 28.1 360 -35 235 27.6 361 -35 245 38.2 362 -35 255 31.8 363 -35 265 29.6 364 -35 275 29.0 365 -35 285 19.1 367 -35 305 25.0 368 -35 315 34.3 369 -35 325 36.9 370 -35 335 35.3 371 -35 345 29.3 372 -35 355 25.4 373 -45 5 11.6 374 -45 15 17.6 375 -45 25 19.9 376 -45 35 13.4 377 -45 45 11.1 378 -45 55 10.8 379 -45 65 17.6 380 -45 75 20.5 382 -45 95 9.7 383 -45 105 12.8 384 -45 115 19.6 385 -45 125 15.5 386 -45 135 19.6 387 -45 145 27.2 388 -45 155 20.8 389 -45 165 18.3 390 -45 175 20.8 391 -45 185 18.7 392 -45 195 18.8 393 -45 205 17.6 394 -45 215 17.9 395 -45 225 24.5 396 -45 235 27.5 397 -45 245 18.7 398 -45 255 19.3 399 -45 265 20.3 400 -45 275 21.8 401 -45 285 19.2 402 -45 295 15.1 403 -45 305 20.3 404 -45 315 23.1 405 -45 325 20.4 406 -45 335 22.3 407 -45 345 27.3 408 -45 355 20.6 409 -55 10 7.8 410 -55 30 9.4 411 -55 50 11.4 412 -55 70 11.7 417 -55 170 16.0 419 -55 210 10.9 420 -55 230 20.4 421 -55 250 17.9 422 -55 270 15.9 423 -55 290 15.1 424 -55 310 10.6 425 -55 330 17.9 429 -65 50 6.0 433 -65 130 2.5 435 -65 170 7.1 442 -65 310 6.5 443 -65 330 4.8