Stratocumulus Frequency of Occurrence (%) September, October, November (1954 - 1997) Night, Ship Observations Only Global Average: 32.5 Zonal Averages 17 zones Lat.N Average 85 34.1 75 39.1 65 41.5 55 39.5 45 37.0 35 31.3 25 23.7 15 20.6 5 23.3 -5 24.4 -15 31.2 -25 37.2 -35 39.8 -45 39.6 -55 42.4 -65 41.2 -75 38.6 Grid Box Averages 384 filled boxes Box # Lat.N Lon.E Average 1 85 60 34.6 2 85 180 34.1 3 85 300 33.2 4 75 20 39.9 5 75 60 44.4 6 75 100 39.1 7 75 140 37.5 8 75 180 33.3 9 75 220 32.7 10 75 260 55.5 11 75 300 42.6 12 75 340 41.4 13 65 10 34.9 14 65 30 43.0 15 65 50 40.7 16 65 70 41.7 20 65 150 40.5 21 65 170 52.8 22 65 190 53.4 23 65 210 27.9 25 65 250 49.9 26 65 270 51.0 27 65 290 44.1 28 65 310 35.2 29 65 330 34.4 30 65 350 39.0 31 55 10 30.7 32 55 30 35.9 38 55 150 35.8 39 55 170 43.0 40 55 190 43.5 41 55 210 39.5 42 55 230 32.7 44 55 270 48.2 45 55 290 37.9 46 55 310 38.2 47 55 330 39.3 48 55 350 40.8 49 45 5 20.6 50 45 15 19.6 51 45 25 22.6 52 45 35 24.1 53 45 45 23.4 54 45 55 20.0 62 45 135 21.1 63 45 145 31.3 64 45 155 41.1 65 45 165 42.6 66 45 175 42.7 67 45 185 41.8 68 45 195 39.7 69 45 205 37.9 70 45 215 39.4 71 45 225 43.5 72 45 235 33.5 77 45 285 22.9 78 45 295 28.9 79 45 305 33.0 80 45 315 37.7 81 45 325 37.0 82 45 335 38.0 83 45 345 41.1 84 45 355 31.9 85 35 5 21.6 86 35 15 15.8 87 35 25 12.0 88 35 35 10.6 90 35 55 17.1 96 35 115 21.3 97 35 125 23.5 98 35 135 24.9 99 35 145 33.3 100 35 155 37.2 101 35 165 37.2 102 35 175 39.1 103 35 185 38.9 104 35 195 36.5 105 35 205 36.8 106 35 215 40.0 107 35 225 49.1 108 35 235 37.8 109 35 245 33.0 112 35 275 21.4 113 35 285 24.0 114 35 295 26.3 115 35 305 24.5 116 35 315 24.6 117 35 325 26.5 118 35 335 31.4 119 35 345 30.2 120 35 355 20.3 124 25 35 4.3 125 25 45 6.5 126 25 55 4.0 127 25 65 9.2 128 25 75 7.7 129 25 85 18.3 130 25 95 17.7 131 25 105 21.4 132 25 115 27.5 133 25 125 28.7 134 25 135 25.7 135 25 145 21.3 136 25 155 21.9 137 25 165 21.0 138 25 175 24.7 139 25 185 24.3 140 25 195 20.7 141 25 205 23.1 142 25 215 31.9 143 25 225 46.2 144 25 235 51.0 145 25 245 25.8 146 25 255 17.1 147 25 265 19.8 148 25 275 19.6 149 25 285 18.9 150 25 295 16.4 151 25 305 15.4 152 25 315 16.4 153 25 325 19.4 154 25 335 23.1 155 25 345 16.0 160 15 35 5.4 161 15 45 6.8 162 15 55 11.6 163 15 65 13.0 164 15 75 17.3 165 15 85 18.5 166 15 95 18.8 167 15 105 21.2 168 15 115 23.3 169 15 125 25.0 170 15 135 20.6 171 15 145 19.4 172 15 155 18.3 173 15 165 15.4 174 15 175 18.4 175 15 185 18.1 176 15 195 20.6 177 15 205 23.0 178 15 215 29.1 179 15 225 35.3 180 15 235 40.9 181 15 245 26.6 182 15 255 18.4 183 15 265 21.7 184 15 275 19.8 185 15 285 15.8 186 15 295 13.2 187 15 305 13.5 188 15 315 17.3 189 15 325 22.7 190 15 335 21.5 191 15 345 12.9 193 5 5 28.7 197 5 45 11.4 198 5 55 10.3 199 5 65 13.3 200 5 75 18.5 201 5 85 20.6 202 5 95 22.9 203 5 105 23.4 204 5 115 23.2 205 5 125 19.6 206 5 135 16.9 207 5 145 22.8 208 5 155 20.8 209 5 165 17.9 210 5 175 18.5 211 5 185 17.3 212 5 195 20.2 213 5 205 21.3 214 5 215 25.1 215 5 225 26.7 216 5 235 30.7 217 5 245 36.3 218 5 255 39.3 219 5 265 40.7 220 5 275 33.7 221 5 285 32.8 223 5 305 14.3 224 5 315 16.6 225 5 325 19.3 226 5 335 21.9 227 5 345 27.5 228 5 355 33.2 229 -5 5 53.2 230 -5 15 46.2 232 -5 35 6.8 233 -5 45 11.9 234 -5 55 15.1 235 -5 65 19.0 236 -5 75 20.2 237 -5 85 21.3 238 -5 95 21.4 239 -5 105 20.7 240 -5 115 12.3 241 -5 125 11.7 242 -5 135 13.7 243 -5 145 19.5 244 -5 155 22.2 245 -5 165 19.5 246 -5 175 14.5 247 -5 185 12.6 248 -5 195 13.6 249 -5 205 13.1 250 -5 215 13.4 251 -5 225 10.6 252 -5 235 12.4 253 -5 245 24.4 254 -5 255 46.4 255 -5 265 58.9 256 -5 275 53.8 257 -5 285 45.6 260 -5 315 11.5 261 -5 325 13.1 262 -5 335 20.7 263 -5 345 44.5 264 -5 355 56.7 265 -15 5 73.5 266 -15 15 42.1 268 -15 35 13.0 269 -15 45 9.5 270 -15 55 19.7 271 -15 65 23.1 272 -15 75 26.6 273 -15 85 28.2 274 -15 95 28.7 275 -15 105 27.2 276 -15 115 8.7 277 -15 125 7.9 278 -15 135 7.7 279 -15 145 17.5 280 -15 155 18.6 281 -15 165 23.6 282 -15 175 27.5 283 -15 185 23.4 284 -15 195 22.3 285 -15 205 20.8 286 -15 215 21.3 287 -15 225 14.3 288 -15 235 14.4 289 -15 245 26.2 290 -15 255 46.1 291 -15 265 57.2 292 -15 275 73.6 293 -15 285 65.3 297 -15 325 18.6 298 -15 335 32.8 299 -15 345 52.6 300 -15 355 71.2 301 -25 5 63.8 302 -25 15 35.5 304 -25 35 23.5 305 -25 45 24.2 306 -25 55 23.4 307 -25 65 32.3 308 -25 75 38.5 309 -25 85 43.8 310 -25 95 46.2 311 -25 105 42.2 312 -25 115 18.7 315 -25 145 10.7 316 -25 155 18.7 317 -25 165 30.3 318 -25 175 33.1 319 -25 185 30.7 320 -25 195 33.9 321 -25 205 34.8 322 -25 215 35.1 323 -25 225 33.5 324 -25 235 24.7 325 -25 245 23.9 326 -25 255 36.9 327 -25 265 52.6 328 -25 275 63.1 329 -25 285 61.1 332 -25 315 26.7 333 -25 325 27.4 334 -25 335 35.9 335 -25 345 40.0 336 -25 355 53.8 337 -35 5 51.6 338 -35 15 33.1 339 -35 25 29.3 340 -35 35 33.7 341 -35 45 39.6 342 -35 55 35.1 343 -35 65 42.7 344 -35 75 46.7 345 -35 85 48.3 346 -35 95 47.1 347 -35 105 47.9 348 -35 115 34.4 349 -35 125 36.8 350 -35 135 36.2 351 -35 145 30.8 352 -35 155 32.0 353 -35 165 38.0 354 -35 175 35.4 355 -35 185 37.2 356 -35 195 39.5 357 -35 205 38.7 358 -35 215 36.1 359 -35 225 30.8 360 -35 235 37.1 361 -35 245 35.9 362 -35 255 45.5 363 -35 265 52.5 364 -35 275 54.3 365 -35 285 48.8 367 -35 305 24.7 368 -35 315 28.9 369 -35 325 38.5 370 -35 335 38.1 371 -35 345 39.4 372 -35 355 46.6 373 -45 5 45.7 374 -45 15 46.9 376 -45 35 41.4 377 -45 45 40.3 378 -45 55 42.9 379 -45 65 35.1 380 -45 75 35.3 381 -45 85 38.7 382 -45 95 29.3 383 -45 105 34.8 384 -45 115 38.5 385 -45 125 37.6 386 -45 135 40.8 387 -45 145 33.1 388 -45 155 40.1 389 -45 165 42.5 390 -45 175 39.8 391 -45 185 43.9 392 -45 195 44.8 393 -45 205 44.6 394 -45 215 42.6 396 -45 235 44.4 397 -45 245 37.3 398 -45 255 43.2 399 -45 265 35.0 400 -45 275 52.3 401 -45 285 40.0 402 -45 295 32.1 403 -45 305 30.0 404 -45 315 36.4 405 -45 325 43.0 406 -45 335 41.5 407 -45 345 38.3 408 -45 355 31.3 409 -55 10 39.0 410 -55 30 39.2 411 -55 50 32.5 412 -55 70 42.5 413 -55 90 45.1 414 -55 110 38.7 415 -55 130 38.0 416 -55 150 47.3 417 -55 170 62.2 418 -55 190 42.3 419 -55 210 41.0 420 -55 230 52.4 421 -55 250 39.1 422 -55 270 34.6 423 -55 290 40.1 424 -55 310 43.7 425 -55 330 37.5 426 -55 350 47.4 429 -65 50 42.8 430 -65 70 51.6 431 -65 90 49.1 432 -65 110 39.3 433 -65 130 29.9 434 -65 150 42.1 435 -65 170 46.1 436 -65 190 44.2 441 -65 290 48.3 442 -65 310 45.8 443 -65 330 21.8 444 -65 350 35.3 449 -75 180 45.6 453 -75 340 27.6