Cumulus Frequency of Occurrence (%) July (1954 - 1997) , Ship Observations Only Global Average: 31.4 Zonal Averages 16 zones Lat.N Average 85 1.4 75 4.6 65 8.9 55 8.2 45 11.3 35 31.8 25 47.0 15 43.0 5 43.1 -5 50.5 -15 43.7 -25 38.0 -35 28.7 -45 18.9 -55 11.7 -65 1.8 Grid Box Averages 364 filled boxes Box # Lat.N Lon.E Average 1 85 60 1.9 2 85 180 0.6 3 85 300 2.0 4 75 20 7.5 5 75 60 5.5 6 75 100 4.5 7 75 140 1.1 8 75 180 2.8 9 75 220 5.0 10 75 260 9.3 11 75 300 3.7 12 75 340 3.0 13 65 10 13.0 14 65 30 12.4 15 65 50 11.3 16 65 70 15.7 20 65 150 13.0 21 65 170 7.8 22 65 190 5.5 23 65 210 13.2 24 65 230 6.5 25 65 250 12.4 26 65 270 8.3 27 65 290 7.5 28 65 310 4.3 29 65 330 8.9 30 65 350 10.3 31 55 10 18.6 32 55 30 21.6 37 55 130 17.1 38 55 150 7.0 39 55 170 4.7 40 55 190 3.9 41 55 210 7.2 42 55 230 12.5 44 55 270 6.4 45 55 290 9.6 46 55 310 6.5 47 55 330 8.1 48 55 350 13.3 49 45 5 19.1 50 45 15 19.7 51 45 25 19.9 52 45 35 20.5 53 45 45 15.5 54 45 55 15.5 61 45 125 17.4 62 45 135 10.1 63 45 145 7.2 64 45 155 4.0 65 45 165 2.0 66 45 175 2.1 67 45 185 2.7 68 45 195 3.4 69 45 205 5.1 70 45 215 7.3 71 45 225 11.1 72 45 235 15.8 77 45 285 14.3 78 45 295 12.7 79 45 305 15.6 80 45 315 15.2 81 45 325 21.4 82 45 335 21.1 83 45 345 21.9 84 45 355 24.0 85 35 5 19.3 86 35 15 16.9 87 35 25 14.1 88 35 35 27.2 90 35 55 17.3 96 35 115 13.2 97 35 125 22.5 98 35 135 34.6 99 35 145 25.2 100 35 155 22.0 101 35 165 26.6 102 35 175 32.3 103 35 185 31.8 104 35 195 32.7 105 35 205 30.9 106 35 215 24.6 107 35 225 18.2 108 35 235 12.2 109 35 245 10.1 112 35 275 39.2 113 35 285 36.6 114 35 295 44.3 115 35 305 52.2 116 35 315 59.6 117 35 325 52.3 118 35 335 39.9 119 35 345 33.1 120 35 355 17.7 124 25 35 3.8 125 25 45 3.2 126 25 55 10.3 127 25 65 20.6 128 25 75 21.1 129 25 85 30.6 130 25 95 26.1 131 25 105 44.1 132 25 115 46.8 133 25 125 53.1 134 25 135 52.0 135 25 145 51.5 136 25 155 52.8 137 25 165 55.5 138 25 175 58.8 139 25 185 59.9 140 25 195 61.8 141 25 205 53.2 142 25 215 33.3 143 25 225 17.8 144 25 235 12.5 145 25 245 23.7 146 25 255 41.0 147 25 265 55.2 148 25 275 54.0 149 25 285 54.5 150 25 295 61.8 151 25 305 68.5 152 25 315 65.7 153 25 325 52.8 154 25 335 38.1 155 25 345 18.6 160 15 35 6.8 161 15 45 8.2 162 15 55 18.9 163 15 65 36.9 164 15 75 24.7 165 15 85 31.6 166 15 95 30.5 167 15 105 37.1 168 15 115 46.0 169 15 125 43.4 170 15 135 39.9 171 15 145 45.5 172 15 155 49.7 173 15 165 59.3 174 15 175 59.2 175 15 185 59.8 176 15 195 58.3 177 15 205 53.4 178 15 215 40.9 179 15 225 29.7 180 15 235 27.5 181 15 245 40.0 182 15 255 40.6 183 15 265 36.8 184 15 275 42.0 185 15 285 50.3 186 15 295 55.7 187 15 305 57.0 188 15 315 49.3 189 15 325 38.0 190 15 335 32.6 191 15 345 28.2 193 5 5 30.3 197 5 45 52.4 198 5 55 50.1 199 5 65 59.0 200 5 75 43.7 201 5 85 46.3 202 5 95 42.2 203 5 105 46.0 204 5 115 43.5 205 5 125 42.7 206 5 135 41.0 207 5 145 41.4 208 5 155 43.6 209 5 165 42.2 210 5 175 42.4 211 5 185 48.5 212 5 195 50.1 213 5 205 49.9 214 5 215 44.0 215 5 225 49.1 216 5 235 39.3 217 5 245 34.6 218 5 255 29.0 219 5 265 25.1 220 5 275 27.2 221 5 285 28.2 222 5 295 35.5 223 5 305 46.1 224 5 315 49.9 225 5 325 59.1 226 5 335 48.0 227 5 345 35.8 228 5 355 35.4 229 -5 5 31.0 230 -5 15 15.2 232 -5 35 59.1 233 -5 45 56.4 234 -5 55 53.6 235 -5 65 50.3 236 -5 75 47.3 237 -5 85 45.2 238 -5 95 44.4 239 -5 105 54.0 240 -5 115 56.2 241 -5 125 51.3 242 -5 135 50.1 243 -5 145 42.4 244 -5 155 36.4 245 -5 165 45.6 246 -5 175 59.3 247 -5 185 60.0 248 -5 195 64.5 249 -5 205 67.5 250 -5 215 68.9 251 -5 225 65.3 252 -5 235 71.4 253 -5 245 61.1 254 -5 255 41.7 255 -5 265 23.5 256 -5 275 13.6 257 -5 285 8.3 260 -5 315 56.8 261 -5 325 55.0 262 -5 335 59.5 263 -5 345 53.4 264 -5 355 39.5 265 -15 5 17.6 266 -15 15 10.8 268 -15 35 60.0 269 -15 45 56.6 270 -15 55 53.1 271 -15 65 49.6 272 -15 75 48.5 273 -15 85 38.4 274 -15 95 38.4 275 -15 105 52.5 276 -15 115 42.3 277 -15 125 35.3 278 -15 135 50.2 279 -15 145 44.1 280 -15 155 45.3 281 -15 165 43.1 282 -15 175 42.0 283 -15 185 42.1 284 -15 195 53.1 285 -15 205 56.2 286 -15 215 60.4 287 -15 225 64.1 288 -15 235 58.5 289 -15 245 54.2 290 -15 255 41.3 291 -15 265 22.6 292 -15 275 12.6 293 -15 285 7.8 297 -15 325 55.8 298 -15 335 53.9 299 -15 345 44.0 300 -15 355 24.4 301 -25 5 24.3 302 -25 15 20.5 304 -25 35 49.9 305 -25 45 49.1 306 -25 55 50.4 307 -25 65 41.0 308 -25 75 38.6 309 -25 85 31.8 310 -25 95 33.0 311 -25 105 38.9 312 -25 115 30.2 315 -25 145 40.1 316 -25 155 46.0 317 -25 165 46.8 318 -25 175 40.9 319 -25 185 40.1 320 -25 195 35.6 321 -25 205 39.1 322 -25 215 39.2 323 -25 225 41.8 324 -25 235 43.2 325 -25 245 49.6 326 -25 255 38.7 327 -25 265 30.5 328 -25 275 28.3 329 -25 285 20.6 332 -25 315 30.7 333 -25 325 43.6 334 -25 335 39.0 335 -25 345 39.6 336 -25 355 31.4 337 -35 5 24.4 338 -35 15 24.8 339 -35 25 25.8 340 -35 35 39.8 341 -35 45 37.2 342 -35 55 32.6 343 -35 65 26.9 344 -35 75 23.5 345 -35 85 22.0 346 -35 95 23.5 347 -35 105 28.5 348 -35 115 30.5 349 -35 125 27.1 350 -35 135 28.5 351 -35 145 26.3 352 -35 155 35.9 353 -35 165 34.3 354 -35 175 34.8 355 -35 185 33.5 356 -35 195 31.4 357 -35 205 33.0 358 -35 215 31.3 359 -35 225 32.3 360 -35 235 31.0 361 -35 245 32.9 362 -35 255 22.1 363 -35 265 27.0 364 -35 275 25.6 365 -35 285 22.6 367 -35 305 16.9 368 -35 315 28.1 369 -35 325 23.6 370 -35 335 25.8 371 -35 345 28.1 372 -35 355 23.0 374 -45 15 20.6 377 -45 45 13.6 378 -45 55 16.6 379 -45 65 11.7 380 -45 75 8.9 383 -45 105 20.5 384 -45 115 22.7 385 -45 125 15.2 386 -45 135 17.3 387 -45 145 23.3 388 -45 155 24.2 389 -45 165 21.6 390 -45 175 21.5 391 -45 185 15.3 392 -45 195 14.7 393 -45 205 21.9 394 -45 215 18.4 395 -45 225 19.2 396 -45 235 26.5 397 -45 245 19.4 398 -45 255 22.7 399 -45 265 17.8 400 -45 275 23.5 401 -45 285 21.0 402 -45 295 12.7 403 -45 305 15.4 404 -45 315 22.9 405 -45 325 15.3 406 -45 335 22.4 407 -45 345 17.4 408 -45 355 20.6 412 -55 70 8.3 416 -55 150 17.4 417 -55 170 5.8 419 -55 210 8.6 420 -55 230 10.7 421 -55 250 8.8 422 -55 270 15.5 423 -55 290 15.7 424 -55 310 15.3 425 -55 330 11.2 429 -65 50 1.8