Cumulus Frequency of Occurrence (%) June, July, August (1954 - 1997) Day, Ship Observations Only Global Average: 33.4 Zonal Averages 16 zones Lat.N Average 85 1.8 75 5.5 65 11.3 55 11.0 45 14.9 35 34.5 25 48.4 15 45.5 5 45.6 -5 53.3 -15 46.5 -25 40.2 -35 28.5 -45 19.1 -55 13.6 -65 5.9 Grid Box Averages 382 filled boxes Box # Lat.N Lon.E Average 1 85 60 3.0 2 85 180 0.7 3 85 300 1.8 4 75 20 9.6 5 75 60 8.1 6 75 100 4.3 7 75 140 4.4 8 75 180 2.5 9 75 220 4.0 10 75 260 7.1 11 75 300 5.0 12 75 340 4.3 13 65 10 16.2 14 65 30 13.9 15 65 50 13.3 16 65 70 19.1 20 65 150 15.1 21 65 170 10.4 22 65 190 7.0 23 65 210 17.0 24 65 230 11.0 25 65 250 10.1 26 65 270 11.8 27 65 290 7.9 28 65 310 6.1 29 65 330 11.6 30 65 350 13.9 31 55 10 21.2 32 55 30 22.8 37 55 130 14.3 38 55 150 9.4 39 55 170 6.3 40 55 190 5.3 41 55 210 9.7 42 55 230 17.1 44 55 270 9.2 45 55 290 12.4 46 55 310 9.3 47 55 330 12.7 48 55 350 17.4 49 45 5 22.7 50 45 15 25.2 51 45 25 24.4 52 45 35 22.7 53 45 45 14.4 54 45 55 12.2 61 45 125 20.9 62 45 135 13.3 63 45 145 10.6 64 45 155 6.5 65 45 165 4.2 66 45 175 4.6 67 45 185 5.7 68 45 195 6.5 69 45 205 8.5 70 45 215 11.4 71 45 225 16.6 72 45 235 19.6 77 45 285 15.1 78 45 295 14.9 79 45 305 18.7 80 45 315 19.3 81 45 325 26.2 82 45 335 26.3 83 45 345 26.7 84 45 355 27.6 85 35 5 21.2 86 35 15 23.3 87 35 25 18.5 88 35 35 29.7 89 35 45 22.8 90 35 55 15.9 96 35 115 16.6 97 35 125 21.7 98 35 135 33.5 99 35 145 29.2 100 35 155 26.8 101 35 165 30.2 102 35 175 31.1 103 35 185 31.7 104 35 195 32.8 105 35 205 34.0 106 35 215 29.9 107 35 225 25.2 108 35 235 16.9 109 35 245 13.1 112 35 275 42.7 113 35 285 36.9 114 35 295 45.5 115 35 305 52.6 116 35 315 57.7 117 35 325 54.1 118 35 335 46.0 119 35 345 40.4 120 35 355 20.6 124 25 35 4.6 125 25 45 3.7 126 25 55 11.3 127 25 65 27.3 128 25 75 29.5 129 25 85 35.8 130 25 95 32.2 131 25 105 43.3 132 25 115 44.3 133 25 125 46.9 134 25 135 47.5 135 25 145 51.2 136 25 155 53.8 137 25 165 55.9 138 25 175 57.9 139 25 185 60.6 140 25 195 62.1 141 25 205 57.0 142 25 215 40.7 143 25 225 24.4 144 25 235 16.9 145 25 245 25.9 146 25 255 45.1 147 25 265 54.5 148 25 275 51.5 149 25 285 54.4 150 25 295 61.2 151 25 305 67.8 152 25 315 66.5 153 25 325 58.0 154 25 335 46.3 155 25 345 22.8 156 25 355 39.4 160 15 35 7.8 161 15 45 10.4 162 15 55 23.5 163 15 65 39.5 164 15 75 30.8 165 15 85 33.4 166 15 95 31.1 167 15 105 42.1 168 15 115 46.3 169 15 125 44.1 170 15 135 43.5 171 15 145 47.7 172 15 155 52.6 173 15 165 62.4 174 15 175 60.6 175 15 185 58.5 176 15 195 60.1 177 15 205 54.9 178 15 215 45.0 179 15 225 35.8 180 15 235 32.6 181 15 245 41.9 182 15 255 45.9 183 15 265 40.7 184 15 275 43.1 185 15 285 52.5 186 15 295 58.3 187 15 305 57.8 188 15 315 50.2 189 15 325 41.2 190 15 335 37.4 191 15 345 28.3 193 5 5 33.7 197 5 45 56.1 198 5 55 55.3 199 5 65 58.3 200 5 75 45.4 201 5 85 48.9 202 5 95 44.1 203 5 105 48.1 204 5 115 44.7 205 5 125 45.7 206 5 135 42.3 207 5 145 42.6 208 5 155 44.6 209 5 165 47.0 210 5 175 46.5 211 5 185 48.7 212 5 195 54.0 213 5 205 51.4 214 5 215 47.0 215 5 225 48.0 216 5 235 46.8 217 5 245 40.0 218 5 255 33.7 219 5 265 29.9 220 5 275 29.2 221 5 285 27.8 222 5 295 35.0 223 5 305 46.9 224 5 315 51.6 225 5 325 59.4 226 5 335 48.5 227 5 345 37.4 228 5 355 38.4 229 -5 5 35.2 230 -5 15 15.2 232 -5 35 57.3 233 -5 45 59.0 234 -5 55 55.7 235 -5 65 53.7 236 -5 75 50.7 237 -5 85 48.7 238 -5 95 47.3 239 -5 105 54.2 240 -5 115 60.5 241 -5 125 57.6 242 -5 135 52.7 243 -5 145 44.8 244 -5 155 41.5 245 -5 165 49.8 246 -5 175 57.5 247 -5 185 61.9 248 -5 195 64.7 249 -5 205 65.5 250 -5 215 69.3 251 -5 225 66.2 252 -5 235 70.8 253 -5 245 62.9 254 -5 255 48.1 255 -5 265 31.2 256 -5 275 17.2 257 -5 285 7.1 260 -5 315 65.1 261 -5 325 59.5 262 -5 335 63.6 263 -5 345 55.6 264 -5 355 43.8 265 -15 5 20.5 266 -15 15 12.3 268 -15 35 61.1 269 -15 45 62.0 270 -15 55 56.9 271 -15 65 54.5 272 -15 75 50.1 273 -15 85 44.5 274 -15 95 42.2 275 -15 105 52.8 276 -15 115 45.3 277 -15 125 44.7 278 -15 135 57.7 279 -15 145 48.1 280 -15 155 51.2 281 -15 165 44.9 282 -15 175 45.6 283 -15 185 46.8 284 -15 195 50.8 285 -15 205 55.5 286 -15 215 60.8 287 -15 225 62.5 288 -15 235 62.8 289 -15 245 56.1 290 -15 255 44.7 291 -15 265 27.8 292 -15 275 14.8 293 -15 285 9.0 297 -15 325 58.1 298 -15 335 55.8 299 -15 345 45.3 300 -15 355 28.5 301 -25 5 28.0 302 -25 15 21.4 304 -25 35 52.3 305 -25 45 51.6 306 -25 55 51.6 307 -25 65 44.2 308 -25 75 43.0 309 -25 85 37.8 310 -25 95 38.1 311 -25 105 38.1 312 -25 115 34.6 315 -25 145 42.5 316 -25 155 50.3 317 -25 165 49.1 318 -25 175 42.2 319 -25 185 42.8 320 -25 195 38.8 321 -25 205 38.6 322 -25 215 40.7 323 -25 225 42.3 324 -25 235 47.9 325 -25 245 51.2 326 -25 255 40.2 327 -25 265 30.1 328 -25 275 29.9 329 -25 285 19.2 332 -25 315 33.3 333 -25 325 47.5 334 -25 335 43.6 335 -25 345 38.4 336 -25 355 32.5 337 -35 5 25.2 338 -35 15 27.0 339 -35 25 27.2 340 -35 35 40.2 341 -35 45 35.4 342 -35 55 31.6 343 -35 65 28.9 344 -35 75 25.2 345 -35 85 24.9 346 -35 95 24.1 347 -35 105 27.3 348 -35 115 30.2 349 -35 125 27.7 350 -35 135 27.1 351 -35 145 26.4 352 -35 155 37.8 353 -35 165 32.9 354 -35 175 33.2 355 -35 185 33.5 356 -35 195 29.7 357 -35 205 30.6 358 -35 215 29.2 359 -35 225 29.8 360 -35 235 27.4 361 -35 245 26.6 362 -35 255 21.1 363 -35 265 23.0 364 -35 275 27.7 365 -35 285 23.9 366 -35 295 14.7 367 -35 305 19.2 368 -35 315 29.9 369 -35 325 26.7 370 -35 335 27.5 371 -35 345 28.1 372 -35 355 25.3 373 -45 5 18.4 374 -45 15 22.6 375 -45 25 15.1 376 -45 35 12.2 377 -45 45 15.4 378 -45 55 15.9 379 -45 65 14.2 380 -45 75 12.8 381 -45 85 12.0 382 -45 95 18.9 383 -45 105 17.7 384 -45 115 16.5 385 -45 125 20.9 386 -45 135 22.6 387 -45 145 29.4 388 -45 155 23.9 389 -45 165 20.8 390 -45 175 23.0 391 -45 185 18.4 392 -45 195 19.3 393 -45 205 19.9 394 -45 215 19.1 395 -45 225 20.6 396 -45 235 23.6 397 -45 245 19.1 398 -45 255 18.7 399 -45 265 24.5 400 -45 275 21.7 401 -45 285 20.6 402 -45 295 15.7 403 -45 305 17.5 404 -45 315 20.3 405 -45 325 18.6 406 -45 335 19.6 407 -45 345 17.9 408 -45 355 22.0 409 -55 10 16.6 410 -55 30 19.8 411 -55 50 13.1 412 -55 70 9.7 415 -55 130 9.7 416 -55 150 19.2 417 -55 170 8.3 418 -55 190 10.0 419 -55 210 8.4 420 -55 230 10.8 421 -55 250 9.8 422 -55 270 15.1 423 -55 290 16.7 424 -55 310 13.1 425 -55 330 14.1 426 -55 350 24.4 427 -65 10 7.2 429 -65 50 3.0 434 -65 150 6.4 442 -65 310 5.9 444 -65 350 6.5