Cumulus Frequency of Occurrence (%) June (1954 - 1997) Day, Ship Observations Only Global Average: 33.5 Zonal Averages 16 zones Lat.N Average 85 2.6 75 5.5 65 12.4 55 11.1 45 13.2 35 27.7 25 48.0 15 47.6 5 45.3 -5 55.7 -15 48.9 -25 41.6 -35 28.3 -45 18.3 -55 12.9 -65 5.2 Grid Box Averages 359 filled boxes Box # Lat.N Lon.E Average 1 85 60 6.2 2 85 180 0.7 3 85 300 0.4 4 75 20 10.7 5 75 60 7.7 6 75 100 9.8 7 75 140 2.3 8 75 180 1.5 9 75 220 1.3 10 75 260 9.8 11 75 300 10.2 12 75 340 3.7 13 65 10 15.9 14 65 30 14.5 15 65 50 12.5 20 65 150 13.3 21 65 170 8.6 22 65 190 6.4 23 65 210 18.0 27 65 290 10.7 29 65 330 12.5 30 65 350 15.5 31 55 10 18.4 32 55 30 16.0 37 55 130 11.5 38 55 150 8.4 39 55 170 5.3 40 55 190 6.3 41 55 210 10.6 42 55 230 18.1 45 55 290 18.0 46 55 310 9.2 47 55 330 13.4 48 55 350 17.5 49 45 5 23.0 50 45 15 25.6 51 45 25 20.6 52 45 35 18.8 53 45 45 13.7 54 45 55 9.4 61 45 125 21.1 62 45 135 9.9 63 45 145 8.6 64 45 155 5.2 65 45 165 3.1 66 45 175 3.9 67 45 185 5.5 68 45 195 6.6 69 45 205 7.7 70 45 215 10.5 71 45 225 15.9 72 45 235 21.4 77 45 285 12.3 78 45 295 12.8 79 45 305 14.0 80 45 315 15.5 81 45 325 22.3 82 45 335 23.2 83 45 345 24.8 84 45 355 25.9 85 35 5 20.9 86 35 15 20.9 87 35 25 18.1 88 35 35 25.6 89 35 45 21.5 90 35 55 13.6 96 35 115 11.7 97 35 125 13.1 98 35 135 22.7 99 35 145 20.2 100 35 155 17.6 101 35 165 17.8 102 35 175 20.0 103 35 185 20.4 104 35 195 21.0 105 35 205 25.2 106 35 215 23.6 107 35 225 22.9 108 35 235 18.2 109 35 245 12.2 112 35 275 42.0 113 35 285 33.3 114 35 295 41.3 115 35 305 44.8 116 35 315 49.4 117 35 325 45.5 118 35 335 39.8 119 35 345 37.6 120 35 355 23.9 124 25 35 3.9 125 25 45 6.3 126 25 55 8.9 127 25 65 37.4 128 25 75 44.5 129 25 85 31.1 131 25 105 39.0 132 25 115 40.3 133 25 125 38.5 134 25 135 42.2 135 25 145 53.1 136 25 155 56.0 137 25 165 55.7 138 25 175 58.2 139 25 185 62.0 140 25 195 61.7 141 25 205 56.1 142 25 215 39.6 143 25 225 25.3 144 25 235 18.6 145 25 245 19.4 146 25 255 36.1 147 25 265 57.7 148 25 275 51.5 149 25 285 50.9 150 25 295 58.9 151 25 305 66.0 152 25 315 65.3 153 25 325 58.9 154 25 335 50.1 155 25 345 27.0 160 15 35 7.6 161 15 45 12.8 162 15 55 29.9 163 15 65 45.8 164 15 75 33.9 165 15 85 31.9 166 15 95 32.0 167 15 105 42.0 168 15 115 48.7 169 15 125 49.4 170 15 135 53.3 171 15 145 57.3 172 15 155 60.1 173 15 165 68.7 174 15 175 63.1 175 15 185 60.0 176 15 195 62.2 177 15 205 58.3 178 15 215 47.1 179 15 225 36.9 180 15 235 30.0 181 15 245 37.9 182 15 255 45.5 183 15 265 40.4 184 15 275 42.2 185 15 285 50.6 186 15 295 58.8 187 15 305 57.1 188 15 315 49.4 189 15 325 42.3 190 15 335 38.5 191 15 345 21.6 193 5 5 35.2 197 5 45 56.4 198 5 55 57.7 199 5 65 53.6 200 5 75 43.6 201 5 85 49.0 202 5 95 44.6 203 5 105 49.0 204 5 115 46.7 205 5 125 43.3 206 5 135 40.6 207 5 145 40.7 208 5 155 42.9 209 5 165 44.8 210 5 175 45.5 211 5 185 45.0 212 5 195 54.7 213 5 205 48.1 214 5 215 47.3 215 5 225 46.9 216 5 235 50.5 217 5 245 46.1 218 5 255 39.4 219 5 265 35.2 220 5 275 29.9 221 5 285 27.1 222 5 295 30.4 223 5 305 40.1 224 5 315 47.2 225 5 325 54.6 226 5 335 45.4 227 5 345 39.9 228 5 355 41.9 229 -5 5 43.7 230 -5 15 20.0 232 -5 35 56.5 233 -5 45 59.1 234 -5 55 57.1 235 -5 65 55.8 236 -5 75 51.9 237 -5 85 50.6 238 -5 95 48.3 239 -5 105 52.1 240 -5 115 59.5 241 -5 125 55.9 242 -5 135 51.3 243 -5 145 46.0 244 -5 155 44.2 245 -5 165 53.0 246 -5 175 56.8 247 -5 185 62.1 248 -5 195 64.4 249 -5 205 64.4 250 -5 215 68.0 251 -5 225 63.7 252 -5 235 74.1 253 -5 245 70.0 254 -5 255 57.9 255 -5 265 40.7 256 -5 275 23.0 257 -5 285 8.8 260 -5 315 62.0 261 -5 325 57.8 262 -5 335 65.4 263 -5 345 62.2 264 -5 355 55.1 265 -15 5 30.9 266 -15 15 14.7 268 -15 35 59.6 269 -15 45 61.3 270 -15 55 57.2 271 -15 65 56.6 272 -15 75 51.2 273 -15 85 49.0 274 -15 95 42.4 275 -15 105 51.2 276 -15 115 48.6 277 -15 125 47.5 278 -15 135 57.9 279 -15 145 47.7 280 -15 155 51.7 281 -15 165 44.9 282 -15 175 48.2 283 -15 185 49.4 284 -15 195 51.6 285 -15 205 54.2 286 -15 215 59.9 287 -15 225 61.1 288 -15 235 68.7 289 -15 245 59.4 290 -15 255 51.9 291 -15 265 33.4 292 -15 275 17.3 293 -15 285 8.6 297 -15 325 56.6 298 -15 335 58.9 299 -15 345 49.8 300 -15 355 40.8 301 -25 5 31.6 302 -25 15 22.0 304 -25 35 54.1 305 -25 45 52.7 306 -25 55 51.6 307 -25 65 45.6 308 -25 75 43.6 309 -25 85 43.5 310 -25 95 38.4 311 -25 105 39.1 312 -25 115 35.4 315 -25 145 42.4 316 -25 155 50.5 317 -25 165 47.0 318 -25 175 40.1 319 -25 185 41.6 320 -25 195 41.0 321 -25 205 38.3 322 -25 215 39.0 323 -25 225 43.5 324 -25 235 49.5 325 -25 245 53.3 326 -25 255 39.8 327 -25 265 36.8 328 -25 275 31.4 329 -25 285 18.7 332 -25 315 36.7 333 -25 325 48.9 334 -25 335 47.9 335 -25 345 43.4 336 -25 355 36.1 337 -35 5 27.9 338 -35 15 26.9 339 -35 25 27.1 340 -35 35 42.7 341 -35 45 38.2 342 -35 55 32.1 343 -35 65 28.9 344 -35 75 25.3 345 -35 85 27.3 346 -35 95 24.9 347 -35 105 28.1 348 -35 115 29.9 349 -35 125 26.7 350 -35 135 25.5 351 -35 145 24.8 352 -35 155 36.2 353 -35 165 30.7 354 -35 175 31.8 355 -35 185 33.0 356 -35 195 27.5 357 -35 205 29.4 358 -35 215 25.0 359 -35 225 30.2 360 -35 235 27.6 361 -35 245 24.2 362 -35 255 19.4 363 -35 265 22.7 364 -35 275 24.2 365 -35 285 18.5 367 -35 305 21.1 368 -35 315 32.1 369 -35 325 28.4 370 -35 335 27.8 371 -35 345 27.8 372 -35 355 27.4 376 -45 35 8.5 377 -45 45 14.3 378 -45 55 12.8 379 -45 65 21.4 380 -45 75 13.6 383 -45 105 15.8 384 -45 115 8.9 385 -45 125 20.4 386 -45 135 29.0 387 -45 145 29.5 388 -45 155 20.1 389 -45 165 18.3 390 -45 175 22.3 391 -45 185 15.6 392 -45 195 16.1 393 -45 205 18.5 394 -45 215 14.4 395 -45 225 20.5 396 -45 235 21.0 397 -45 245 20.0 398 -45 255 17.3 399 -45 265 22.1 400 -45 275 19.5 401 -45 285 18.9 402 -45 295 16.6 403 -45 305 19.6 404 -45 315 20.9 405 -45 325 19.0 406 -45 335 19.1 407 -45 345 18.6 408 -45 355 15.8 409 -55 10 9.8 411 -55 50 13.5 412 -55 70 13.6 417 -55 170 6.0 419 -55 210 15.0 420 -55 230 10.9 421 -55 250 14.5 422 -55 270 13.3 423 -55 290 16.4 424 -55 310 12.8 425 -55 330 16.8 442 -65 310 5.2