Cumulus Frequency of Occurrence (%) June, July, August (1954 - 1997) Night, Ship Observations Only Global Average: 31.6 Zonal Averages 15 zones Lat.N Average 85 1.5 75 4.0 65 8.4 55 8.0 45 10.6 35 29.1 25 44.7 15 42.4 5 41.2 -5 49.0 -15 41.8 -25 36.2 -35 27.5 -45 19.3 -55 12.1 Grid Box Averages 351 filled boxes Box # Lat.N Lon.E Average 1 85 60 2.6 2 85 180 0.5 3 85 300 1.4 4 75 20 8.3 5 75 60 5.8 6 75 100 2.5 7 75 140 2.7 8 75 180 1.6 9 75 220 2.2 10 75 260 4.3 11 75 300 4.5 12 75 340 3.5 13 65 10 12.0 14 65 30 11.7 15 65 50 10.4 16 65 70 8.9 20 65 150 9.4 21 65 170 6.7 22 65 190 5.4 23 65 210 9.2 24 65 230 6.5 25 65 250 9.3 26 65 270 8.2 27 65 290 6.1 28 65 310 4.1 29 65 330 8.8 30 65 350 10.4 31 55 10 16.1 32 55 30 16.6 37 55 130 10.2 38 55 150 6.7 39 55 170 4.5 40 55 190 4.5 41 55 210 7.7 42 55 230 11.7 44 55 270 7.6 45 55 290 9.6 46 55 310 6.5 47 55 330 8.6 48 55 350 12.2 49 45 5 18.2 50 45 15 16.2 51 45 25 16.9 52 45 35 18.2 53 45 45 9.8 54 45 55 13.5 62 45 135 10.5 63 45 145 6.7 64 45 155 4.2 65 45 165 2.7 66 45 175 3.0 67 45 185 4.2 68 45 195 5.8 69 45 205 6.4 70 45 215 7.1 71 45 225 11.2 72 45 235 14.6 77 45 285 12.8 78 45 295 11.5 79 45 305 13.3 80 45 315 13.8 81 45 325 18.5 82 45 335 17.5 83 45 345 19.4 84 45 355 21.6 85 35 5 23.0 86 35 15 16.5 87 35 25 13.5 88 35 35 25.9 96 35 115 9.9 97 35 125 23.3 98 35 135 31.9 99 35 145 24.4 100 35 155 19.6 101 35 165 24.8 102 35 175 27.6 103 35 185 28.6 104 35 195 29.9 105 35 205 26.0 106 35 215 21.9 107 35 225 18.7 108 35 235 13.6 109 35 245 10.2 112 35 275 40.8 113 35 285 35.1 114 35 295 40.5 115 35 305 46.4 116 35 315 54.6 117 35 325 46.3 118 35 335 33.1 119 35 345 30.1 120 35 355 19.6 124 25 35 3.9 125 25 45 5.8 126 25 55 9.1 127 25 65 25.4 128 25 75 40.0 129 25 85 24.0 130 25 95 32.5 131 25 105 31.1 132 25 115 41.2 133 25 125 45.5 134 25 135 46.3 135 25 145 48.4 136 25 155 49.7 137 25 165 51.0 138 25 175 53.2 139 25 185 57.5 140 25 195 60.1 141 25 205 52.5 142 25 215 32.9 143 25 225 16.9 144 25 235 12.3 145 25 245 20.9 146 25 255 33.4 147 25 265 54.1 148 25 275 53.3 149 25 285 49.3 150 25 295 58.1 151 25 305 65.5 152 25 315 62.7 153 25 325 54.6 154 25 335 38.5 155 25 345 20.5 160 15 35 8.3 161 15 45 10.0 162 15 55 20.7 163 15 65 40.9 164 15 75 27.9 165 15 85 31.7 166 15 95 30.4 167 15 105 33.9 168 15 115 43.4 169 15 125 41.1 170 15 135 39.5 171 15 145 45.0 172 15 155 50.5 173 15 165 59.7 174 15 175 55.8 175 15 185 58.9 176 15 195 58.2 177 15 205 53.1 178 15 215 38.0 179 15 225 29.9 180 15 235 26.5 181 15 245 37.1 182 15 255 36.5 183 15 265 33.0 184 15 275 42.7 185 15 285 48.2 186 15 295 55.4 187 15 305 57.5 188 15 315 49.4 189 15 325 38.1 190 15 335 34.4 191 15 345 23.7 193 5 5 28.1 197 5 45 52.5 198 5 55 48.0 199 5 65 57.2 200 5 75 42.3 201 5 85 45.0 202 5 95 40.0 203 5 105 41.9 204 5 115 39.8 205 5 125 39.8 206 5 135 38.6 207 5 145 38.8 208 5 155 40.9 209 5 165 40.5 210 5 175 44.6 211 5 185 46.5 212 5 195 50.8 213 5 205 48.8 214 5 215 44.4 215 5 225 42.3 216 5 235 41.0 217 5 245 32.7 218 5 255 29.4 219 5 265 23.2 220 5 275 24.2 221 5 285 27.2 223 5 305 45.0 224 5 315 47.0 225 5 325 54.9 226 5 335 44.7 227 5 345 32.3 228 5 355 29.1 229 -5 5 26.7 230 -5 15 16.4 232 -5 35 58.6 233 -5 45 57.6 234 -5 55 52.3 235 -5 65 49.9 236 -5 75 48.0 237 -5 85 45.5 238 -5 95 44.5 239 -5 105 50.4 240 -5 115 53.5 241 -5 125 46.3 242 -5 135 47.9 243 -5 145 41.8 244 -5 155 37.1 245 -5 165 47.8 246 -5 175 53.2 247 -5 185 57.6 248 -5 195 62.0 249 -5 205 68.8 250 -5 215 66.9 251 -5 225 65.0 252 -5 235 69.3 253 -5 245 59.8 254 -5 255 39.2 255 -5 265 20.3 256 -5 275 11.9 257 -5 285 7.7 260 -5 315 52.3 261 -5 325 55.4 262 -5 335 57.6 263 -5 345 50.8 264 -5 355 35.5 265 -15 5 13.9 266 -15 15 12.7 268 -15 35 54.3 269 -15 45 50.4 270 -15 55 49.8 271 -15 65 48.4 272 -15 75 43.5 273 -15 85 39.4 274 -15 95 37.1 275 -15 105 50.5 276 -15 115 38.7 277 -15 125 27.1 278 -15 135 46.9 279 -15 145 42.3 280 -15 155 45.3 281 -15 165 42.0 282 -15 175 39.8 283 -15 185 43.5 284 -15 195 51.3 285 -15 205 53.9 286 -15 215 57.5 287 -15 225 62.7 288 -15 235 57.1 289 -15 245 53.6 290 -15 255 39.3 291 -15 265 27.4 292 -15 275 10.6 293 -15 285 8.4 297 -15 325 54.5 298 -15 335 52.3 299 -15 345 40.4 300 -15 355 19.1 301 -25 5 20.9 302 -25 15 21.1 304 -25 35 45.0 305 -25 45 46.7 306 -25 55 47.1 307 -25 65 37.4 308 -25 75 35.1 309 -25 85 30.3 310 -25 95 30.1 311 -25 105 40.0 312 -25 115 31.5 315 -25 145 32.7 316 -25 155 43.3 317 -25 165 44.9 318 -25 175 37.4 319 -25 185 35.7 320 -25 195 37.5 321 -25 205 36.3 322 -25 215 37.2 323 -25 225 41.8 324 -25 235 42.8 325 -25 245 49.9 326 -25 255 43.4 327 -25 265 24.4 328 -25 275 25.4 329 -25 285 20.6 332 -25 315 29.0 333 -25 325 43.7 334 -25 335 37.9 335 -25 345 35.6 336 -25 355 28.5 337 -35 5 20.5 338 -35 15 25.4 339 -35 25 23.0 340 -35 35 36.3 341 -35 45 33.3 342 -35 55 29.4 343 -35 65 25.6 344 -35 75 21.2 345 -35 85 19.9 346 -35 95 21.7 347 -35 105 30.5 348 -35 115 32.2 349 -35 125 29.5 350 -35 135 28.3 351 -35 145 26.3 352 -35 155 34.4 353 -35 165 35.6 354 -35 175 32.5 355 -35 185 31.4 356 -35 195 32.9 357 -35 205 32.6 358 -35 215 29.4 359 -35 225 31.2 360 -35 235 27.4 361 -35 245 22.4 363 -35 265 21.8 364 -35 275 29.5 365 -35 285 23.1 367 -35 305 14.9 368 -35 315 25.8 369 -35 325 25.3 370 -35 335 27.8 371 -35 345 26.4 372 -35 355 21.9 377 -45 45 15.5 378 -45 55 14.3 379 -45 65 23.5 380 -45 75 12.6 385 -45 125 24.3 386 -45 135 18.9 387 -45 145 23.7 388 -45 155 24.4 389 -45 165 23.9 390 -45 175 19.6 391 -45 185 16.7 392 -45 195 15.8 393 -45 205 19.4 394 -45 215 16.1 395 -45 225 20.8 396 -45 235 22.0 397 -45 245 18.7 398 -45 255 16.9 399 -45 265 21.9 400 -45 275 22.0 401 -45 285 21.7 402 -45 295 14.0 403 -45 305 18.4 404 -45 315 23.0 405 -45 325 15.0 408 -45 355 18.1 412 -55 70 8.3 417 -55 170 9.4 420 -55 230 7.2 422 -55 270 16.8 423 -55 290 14.9 424 -55 310 15.2 425 -55 330 13.5