Cumulus Frequency of Occurrence (%) January (1954 - 1997) Night, Ship Observations Only Global Average: 31.6 Zonal Averages 17 zones Lat.N Average 85 0.4 75 4.9 65 13.0 55 16.0 45 17.2 35 27.4 25 38.2 15 47.0 5 44.1 -5 48.7 -15 43.4 -25 42.3 -35 30.0 -45 17.2 -55 10.4 -65 6.6 -75 9.3 Grid Box Averages 364 filled boxes Box # Lat.N Lon.E Average 2 85 180 0.4 4 75 20 13.5 5 75 60 4.7 8 75 180 1.0 9 75 220 0.9 13 65 10 14.7 14 65 30 12.2 21 65 170 9.0 22 65 190 6.7 23 65 210 3.4 29 65 330 13.4 30 65 350 16.5 31 55 10 17.7 32 55 30 15.2 38 55 150 11.7 39 55 170 12.2 40 55 190 14.1 41 55 210 13.4 42 55 230 13.1 46 55 310 23.6 47 55 330 19.7 48 55 350 16.3 49 45 5 22.5 50 45 15 19.4 51 45 25 14.6 52 45 35 13.7 62 45 135 17.8 63 45 145 19.9 64 45 155 15.6 65 45 165 16.6 66 45 175 15.4 67 45 185 18.1 68 45 195 16.5 69 45 205 15.7 70 45 215 15.9 71 45 225 15.4 72 45 235 15.6 77 45 285 15.9 78 45 295 16.8 79 45 305 14.4 80 45 315 16.6 81 45 325 20.7 82 45 335 20.1 83 45 345 19.4 84 45 355 20.7 85 35 5 27.7 86 35 15 33.9 87 35 25 33.7 88 35 35 33.3 97 35 125 21.7 98 35 135 34.9 99 35 145 27.9 100 35 155 25.7 101 35 165 32.1 102 35 175 25.8 103 35 185 24.6 104 35 195 24.8 105 35 205 23.0 106 35 215 21.2 107 35 225 22.0 108 35 235 20.3 109 35 245 20.3 112 35 275 26.0 113 35 285 25.1 114 35 295 26.8 115 35 305 29.9 116 35 315 35.2 117 35 325 31.2 118 35 335 29.1 119 35 345 29.9 120 35 355 25.1 124 25 35 27.5 125 25 45 16.6 126 25 55 23.6 127 25 65 28.0 132 25 115 20.6 133 25 125 27.3 134 25 135 37.5 135 25 145 41.0 136 25 155 39.2 137 25 165 39.4 138 25 175 39.2 139 25 185 38.0 140 25 195 41.8 141 25 205 41.9 142 25 215 35.3 143 25 225 27.6 144 25 235 27.4 145 25 245 24.7 146 25 255 30.3 147 25 265 26.9 148 25 275 39.6 149 25 285 44.9 150 25 295 51.2 151 25 305 54.0 152 25 315 49.4 153 25 325 49.0 154 25 335 45.5 155 25 345 23.8 160 15 35 33.4 161 15 45 35.2 162 15 55 51.0 163 15 65 54.5 164 15 75 32.6 165 15 85 51.1 166 15 95 38.3 167 15 105 29.8 168 15 115 46.4 169 15 125 39.7 170 15 135 46.9 171 15 145 48.7 172 15 155 56.4 173 15 165 55.8 174 15 175 55.8 175 15 185 47.6 176 15 195 52.1 177 15 205 49.4 178 15 215 42.1 179 15 225 40.4 180 15 235 33.7 181 15 245 39.3 182 15 255 42.4 183 15 265 33.8 184 15 275 44.8 185 15 285 56.7 186 15 295 62.8 187 15 305 62.5 188 15 315 57.4 189 15 325 47.1 190 15 335 35.6 191 15 345 8.6 193 5 5 39.0 197 5 45 63.4 198 5 55 64.2 199 5 65 62.9 200 5 75 46.7 201 5 85 50.9 202 5 95 45.5 203 5 105 42.6 204 5 115 42.7 205 5 125 39.8 206 5 135 48.5 207 5 145 43.1 208 5 155 46.6 209 5 165 44.1 210 5 175 50.2 211 5 185 41.6 212 5 195 54.8 213 5 205 48.5 214 5 215 35.3 215 5 225 33.1 216 5 235 40.6 217 5 245 43.7 218 5 255 40.0 219 5 265 37.0 220 5 275 37.8 221 5 285 30.5 223 5 305 51.1 224 5 315 39.6 225 5 325 42.0 226 5 335 37.2 227 5 345 29.3 228 5 355 37.8 229 -5 5 36.3 230 -5 15 30.7 233 -5 45 59.5 234 -5 55 53.1 235 -5 65 48.0 236 -5 75 41.6 237 -5 85 41.2 238 -5 95 35.2 239 -5 105 38.8 240 -5 115 35.8 241 -5 125 40.6 242 -5 135 38.1 243 -5 145 36.8 244 -5 155 35.5 245 -5 165 41.2 246 -5 175 43.5 247 -5 185 54.2 248 -5 195 59.1 249 -5 205 71.7 250 -5 215 73.3 251 -5 225 68.6 252 -5 235 71.4 253 -5 245 60.3 254 -5 255 41.0 255 -5 265 36.5 256 -5 275 25.3 257 -5 285 25.7 260 -5 315 44.9 261 -5 325 59.5 262 -5 335 56.2 263 -5 345 51.0 264 -5 355 42.7 265 -15 5 18.1 266 -15 15 16.9 268 -15 35 49.4 269 -15 45 43.2 270 -15 55 48.2 271 -15 65 51.0 272 -15 75 41.9 273 -15 85 46.6 274 -15 95 42.7 275 -15 105 43.9 276 -15 115 40.6 277 -15 125 37.9 278 -15 135 40.9 279 -15 145 35.4 280 -15 155 47.9 281 -15 165 43.4 282 -15 175 42.5 283 -15 185 42.8 284 -15 195 37.1 285 -15 205 48.0 286 -15 215 53.3 287 -15 225 61.2 288 -15 235 60.9 289 -15 245 55.3 290 -15 255 41.8 291 -15 265 35.6 292 -15 275 30.9 293 -15 285 27.3 297 -15 325 60.4 298 -15 335 55.3 299 -15 345 36.0 300 -15 355 26.5 301 -25 5 22.8 302 -25 15 26.7 304 -25 35 49.7 305 -25 45 53.0 306 -25 55 54.0 307 -25 65 48.1 308 -25 75 46.5 309 -25 85 39.6 310 -25 95 30.0 311 -25 105 29.4 312 -25 115 28.0 316 -25 155 46.4 317 -25 165 46.3 318 -25 175 43.6 319 -25 185 42.3 320 -25 195 40.0 321 -25 205 38.9 322 -25 215 40.7 323 -25 225 56.2 324 -25 235 54.3 325 -25 245 54.6 326 -25 255 44.5 327 -25 265 36.2 328 -25 275 29.9 329 -25 285 23.3 332 -25 315 34.4 333 -25 325 52.1 334 -25 335 58.4 335 -25 345 49.5 336 -25 355 35.4 337 -35 5 27.6 338 -35 15 34.2 339 -35 25 29.9 340 -35 35 34.2 341 -35 45 38.4 342 -35 55 32.7 343 -35 65 24.5 344 -35 75 27.3 345 -35 85 25.5 346 -35 95 23.4 347 -35 105 29.9 348 -35 115 29.5 349 -35 125 23.1 350 -35 135 25.5 351 -35 145 27.1 352 -35 155 33.4 353 -35 165 30.2 354 -35 175 33.6 355 -35 185 36.8 356 -35 195 35.2 357 -35 205 31.6 358 -35 215 25.1 359 -35 225 26.5 360 -35 235 32.9 361 -35 245 31.9 362 -35 255 28.1 363 -35 265 24.7 364 -35 275 27.8 365 -35 285 28.9 367 -35 305 29.1 368 -35 315 38.5 369 -35 325 33.2 370 -35 335 28.2 371 -35 345 28.6 372 -35 355 28.9 373 -45 5 19.4 374 -45 15 18.6 375 -45 25 16.5 376 -45 35 11.1 377 -45 45 9.4 378 -45 55 13.0 379 -45 65 16.5 380 -45 75 16.0 381 -45 85 19.0 382 -45 95 20.8 383 -45 105 12.6 384 -45 115 19.4 385 -45 125 17.2 386 -45 135 8.9 387 -45 145 20.2 388 -45 155 19.1 389 -45 165 18.4 390 -45 175 19.6 391 -45 185 22.6 392 -45 195 22.0 393 -45 205 21.2 394 -45 215 14.5 399 -45 265 19.3 400 -45 275 24.7 401 -45 285 22.7 402 -45 295 18.6 403 -45 305 19.5 404 -45 315 23.8 405 -45 325 18.2 406 -45 335 14.3 407 -45 345 7.8 408 -45 355 10.4 409 -55 10 8.3 410 -55 30 10.7 411 -55 50 10.4 412 -55 70 12.0 413 -55 90 9.2 414 -55 110 11.6 415 -55 130 12.0 416 -55 150 7.6 417 -55 170 12.2 418 -55 190 8.9 419 -55 210 7.4 420 -55 230 4.1 421 -55 250 12.1 422 -55 270 13.2 423 -55 290 16.8 424 -55 310 13.3 425 -55 330 9.6 426 -55 350 8.4 427 -65 10 10.2 428 -65 30 4.6 429 -65 50 6.6 430 -65 70 11.1 431 -65 90 5.2 432 -65 110 4.7 433 -65 130 4.9 434 -65 150 6.6 435 -65 170 6.5 436 -65 190 7.3 437 -65 210 4.2 438 -65 230 4.3 439 -65 250 9.5 440 -65 270 9.5 441 -65 290 5.7 442 -65 310 5.3 443 -65 330 4.7 444 -65 350 5.9 449 -75 180 14.1 450 -75 220 4.8 452 -75 300 11.1 453 -75 340 5.7