Cumulus Frequency of Occurrence (%) June, July, August (1954 - 1997) , Ship Observations Only Global Average: 31.8 Zonal Averages 17 zones Lat.N Average 85 1.6 75 4.7 65 9.8 55 9.5 45 12.8 35 31.8 25 46.5 15 44.0 5 43.4 -5 51.2 -15 44.1 -25 38.2 -35 27.8 -45 19.0 -55 14.5 -65 6.9 -75 0.0 Grid Box Averages 385 filled boxes Box # Lat.N Lon.E Average 1 85 60 2.8 2 85 180 0.6 3 85 300 1.6 4 75 20 9.0 5 75 60 6.9 6 75 100 3.4 7 75 140 3.5 8 75 180 2.0 9 75 220 3.1 10 75 260 5.7 11 75 300 4.8 12 75 340 3.9 13 65 10 14.1 14 65 30 12.8 15 65 50 11.9 16 65 70 14.0 20 65 150 12.3 21 65 170 8.6 22 65 190 6.2 23 65 210 13.1 24 65 230 8.7 25 65 250 9.7 26 65 270 10.0 27 65 290 7.0 28 65 310 5.1 29 65 330 10.2 30 65 350 12.2 31 55 10 18.6 32 55 30 19.7 37 55 130 12.3 38 55 150 8.1 39 55 170 5.4 40 55 190 4.9 41 55 210 8.7 42 55 230 14.4 44 55 270 8.4 45 55 290 11.0 46 55 310 7.9 47 55 330 10.7 48 55 350 14.8 49 45 5 20.5 50 45 15 20.7 51 45 25 20.7 52 45 35 20.4 53 45 45 12.1 54 45 55 12.9 61 45 125 15.3 62 45 135 11.9 63 45 145 8.6 64 45 155 5.3 65 45 165 3.4 66 45 175 3.8 67 45 185 4.9 68 45 195 6.2 69 45 205 7.4 70 45 215 9.2 71 45 225 13.9 72 45 235 17.1 77 45 285 13.9 78 45 295 13.2 79 45 305 16.0 80 45 315 16.5 81 45 325 22.4 82 45 335 21.9 83 45 345 23.0 84 45 355 24.6 85 35 5 22.1 86 35 15 19.9 87 35 25 16.0 88 35 35 27.8 89 35 45 19.2 90 35 55 13.1 96 35 115 13.3 97 35 125 22.5 98 35 135 32.7 99 35 145 26.8 100 35 155 23.2 101 35 165 27.5 102 35 175 29.4 103 35 185 30.1 104 35 195 31.4 105 35 205 30.0 106 35 215 25.9 107 35 225 21.9 108 35 235 15.2 109 35 245 11.7 112 35 275 41.8 113 35 285 36.0 114 35 295 43.0 115 35 305 49.5 116 35 315 56.2 117 35 325 50.2 118 35 335 39.6 119 35 345 35.2 120 35 355 20.1 124 25 35 4.2 125 25 45 4.8 126 25 55 10.2 127 25 65 26.4 128 25 75 34.8 129 25 85 29.9 130 25 95 32.3 131 25 105 37.2 132 25 115 42.7 133 25 125 46.2 134 25 135 46.9 135 25 145 49.8 136 25 155 51.7 137 25 165 53.5 138 25 175 55.5 139 25 185 59.0 140 25 195 61.1 141 25 205 54.7 142 25 215 36.8 143 25 225 20.7 144 25 235 14.6 145 25 245 23.4 146 25 255 39.3 147 25 265 54.3 148 25 275 52.4 149 25 285 51.9 150 25 295 59.6 151 25 305 66.7 152 25 315 64.6 153 25 325 56.3 154 25 335 42.4 155 25 345 21.6 156 25 355 35.4 160 15 35 8.1 161 15 45 10.2 162 15 55 22.1 163 15 65 40.2 164 15 75 29.3 165 15 85 32.5 166 15 95 30.7 167 15 105 38.0 168 15 115 44.9 169 15 125 42.6 170 15 135 41.5 171 15 145 46.3 172 15 155 51.6 173 15 165 61.1 174 15 175 58.2 175 15 185 58.7 176 15 195 59.1 177 15 205 54.0 178 15 215 41.5 179 15 225 32.9 180 15 235 29.6 181 15 245 39.5 182 15 255 41.2 183 15 265 36.8 184 15 275 42.9 185 15 285 50.3 186 15 295 56.8 187 15 305 57.6 188 15 315 49.8 189 15 325 39.6 190 15 335 35.9 191 15 345 26.0 193 5 5 30.9 197 5 45 54.3 198 5 55 51.6 199 5 65 57.8 200 5 75 43.8 201 5 85 46.9 202 5 95 42.1 203 5 105 45.0 204 5 115 42.3 205 5 125 42.7 206 5 135 40.4 207 5 145 40.7 208 5 155 42.8 209 5 165 43.8 210 5 175 45.5 211 5 185 47.6 212 5 195 52.4 213 5 205 50.1 214 5 215 45.7 215 5 225 45.1 216 5 235 43.9 217 5 245 36.3 218 5 255 31.6 219 5 265 26.6 220 5 275 26.7 221 5 285 27.5 222 5 295 38.3 223 5 305 46.0 224 5 315 49.3 225 5 325 57.1 226 5 335 46.6 227 5 345 34.9 228 5 355 33.7 229 -5 5 31.0 230 -5 15 15.8 232 -5 35 58.0 233 -5 45 58.3 234 -5 55 54.0 235 -5 65 51.8 236 -5 75 49.4 237 -5 85 47.1 238 -5 95 45.9 239 -5 105 52.3 240 -5 115 57.0 241 -5 125 52.0 242 -5 135 50.3 243 -5 145 43.3 244 -5 155 39.3 245 -5 165 48.8 246 -5 175 55.4 247 -5 185 59.8 248 -5 195 63.4 249 -5 205 67.1 250 -5 215 68.1 251 -5 225 65.6 252 -5 235 70.1 253 -5 245 61.3 254 -5 255 43.7 255 -5 265 25.8 256 -5 275 14.5 257 -5 285 7.4 260 -5 315 58.7 261 -5 325 57.4 262 -5 335 60.6 263 -5 345 53.2 264 -5 355 39.7 265 -15 5 17.2 266 -15 15 12.5 268 -15 35 57.7 269 -15 45 56.2 270 -15 55 53.4 271 -15 65 51.4 272 -15 75 46.8 273 -15 85 42.0 274 -15 95 39.6 275 -15 105 51.7 276 -15 115 42.0 277 -15 125 35.9 278 -15 135 52.3 279 -15 145 45.2 280 -15 155 48.2 281 -15 165 43.4 282 -15 175 42.7 283 -15 185 45.2 284 -15 195 51.0 285 -15 205 54.7 286 -15 215 59.2 287 -15 225 62.6 288 -15 235 60.0 289 -15 245 54.9 290 -15 255 42.0 291 -15 265 27.6 292 -15 275 12.7 293 -15 285 8.7 297 -15 325 56.3 298 -15 335 54.1 299 -15 345 42.8 300 -15 355 23.8 301 -25 5 24.5 302 -25 15 21.3 304 -25 35 48.6 305 -25 45 49.1 306 -25 55 49.3 307 -25 65 40.8 308 -25 75 39.0 309 -25 85 34.0 310 -25 95 34.1 311 -25 105 39.0 312 -25 115 33.1 315 -25 145 37.6 316 -25 155 46.8 317 -25 165 47.0 318 -25 175 39.8 319 -25 185 39.2 320 -25 195 38.2 321 -25 205 37.5 322 -25 215 39.0 323 -25 225 42.0 324 -25 235 45.4 325 -25 245 50.5 326 -25 255 41.8 327 -25 265 27.2 328 -25 275 27.7 329 -25 285 19.9 332 -25 315 31.1 333 -25 325 45.6 334 -25 335 40.7 335 -25 345 37.0 336 -25 355 30.5 337 -35 5 22.8 338 -35 15 26.2 339 -35 25 25.1 340 -35 35 38.2 341 -35 45 34.3 342 -35 55 30.5 343 -35 65 27.3 344 -35 75 23.2 345 -35 85 22.4 346 -35 95 22.9 347 -35 105 28.9 348 -35 115 31.2 349 -35 125 28.6 350 -35 135 27.7 351 -35 145 26.3 352 -35 155 36.1 353 -35 165 34.2 354 -35 175 32.8 355 -35 185 32.5 356 -35 195 31.3 357 -35 205 31.6 358 -35 215 29.3 359 -35 225 30.5 360 -35 235 27.4 361 -35 245 24.5 362 -35 255 18.6 363 -35 265 22.4 364 -35 275 28.6 365 -35 285 23.5 366 -35 295 13.2 367 -35 305 17.0 368 -35 315 27.8 369 -35 325 26.0 370 -35 335 27.6 371 -35 345 27.3 372 -35 355 23.6 373 -45 5 15.3 374 -45 15 21.8 375 -45 25 13.8 376 -45 35 15.5 377 -45 45 15.4 378 -45 55 15.1 379 -45 65 18.9 380 -45 75 12.7 381 -45 85 12.5 382 -45 95 21.6 383 -45 105 18.7 384 -45 115 16.5 385 -45 125 22.6 386 -45 135 20.8 387 -45 145 26.5 388 -45 155 24.2 389 -45 165 22.3 390 -45 175 21.3 391 -45 185 17.6 392 -45 195 17.5 393 -45 205 19.6 394 -45 215 17.6 395 -45 225 20.7 396 -45 235 22.8 397 -45 245 18.9 398 -45 255 17.8 399 -45 265 23.2 400 -45 275 21.9 401 -45 285 21.2 402 -45 295 14.9 403 -45 305 17.9 404 -45 315 21.6 405 -45 325 16.8 406 -45 335 20.8 407 -45 345 17.9 408 -45 355 20.1 409 -55 10 18.1 410 -55 30 21.6 411 -55 50 14.3 412 -55 70 9.0 415 -55 130 10.9 416 -55 150 19.1 417 -55 170 8.9 418 -55 190 10.7 419 -55 210 15.4 420 -55 230 9.0 421 -55 250 14.4 422 -55 270 15.9 423 -55 290 15.8 424 -55 310 14.1 425 -55 330 13.8 426 -55 350 21.7 427 -65 10 7.0 429 -65 50 1.5 434 -65 150 5.9 436 -65 190 15.0 437 -65 210 3.7 442 -65 310 6.0 444 -65 350 7.3 450 -75 220 0.0