Stratocumulus Frequency of Occurrence (%) December (1953 - 1996) Night, Ship Observations Only Global Average: 32.4 Zonal Averages 17 zones Lat.N Average 85 11.9 75 23.8 65 40.3 55 37.0 45 37.0 35 35.2 25 30.4 15 22.6 5 23.1 -5 24.4 -15 30.0 -25 33.6 -35 39.5 -45 39.7 -55 41.2 -65 42.5 -75 53.8 Grid Box Averages 365 filled boxes Box # Lat.N Lon.E Average 1 85 60 12.6 2 85 180 11.2 4 75 20 33.5 5 75 60 35.8 8 75 180 10.8 9 75 220 17.5 13 65 10 30.9 14 65 30 35.5 15 65 50 31.5 21 65 170 53.3 22 65 190 63.7 23 65 210 18.5 29 65 330 35.9 30 65 350 34.5 31 55 10 30.8 32 55 30 41.3 38 55 150 36.6 39 55 170 39.5 40 55 190 40.8 41 55 210 36.3 42 55 230 33.4 46 55 310 33.9 47 55 330 36.1 48 55 350 39.8 49 45 5 25.9 50 45 15 31.9 51 45 25 26.6 52 45 35 34.0 54 45 55 30.7 62 45 135 25.0 63 45 145 36.4 64 45 155 42.6 65 45 165 40.4 66 45 175 38.0 67 45 185 38.6 68 45 195 34.1 69 45 205 34.6 70 45 215 36.1 71 45 225 38.3 72 45 235 33.3 77 45 285 30.2 78 45 295 39.1 79 45 305 39.2 80 45 315 39.0 81 45 325 35.9 82 45 335 38.4 83 45 345 40.1 84 45 355 32.3 85 35 5 24.3 86 35 15 23.4 87 35 25 21.2 88 35 35 18.5 97 35 125 31.3 98 35 135 31.6 99 35 145 36.7 100 35 155 40.6 101 35 165 39.1 102 35 175 39.4 103 35 185 38.8 104 35 195 37.7 105 35 205 38.1 106 35 215 41.7 107 35 225 47.6 108 35 235 37.4 109 35 245 25.1 112 35 275 29.8 113 35 285 31.4 114 35 295 33.3 115 35 305 32.8 116 35 315 30.4 117 35 325 33.6 118 35 335 38.1 119 35 345 33.0 120 35 355 24.1 124 25 35 6.8 125 25 45 16.4 126 25 55 10.3 127 25 65 7.2 129 25 85 15.4 132 25 115 31.1 133 25 125 39.4 134 25 135 41.5 135 25 145 34.1 136 25 155 33.0 137 25 165 29.9 138 25 175 32.2 139 25 185 33.3 140 25 195 31.2 141 25 205 31.4 142 25 215 36.5 143 25 225 48.3 144 25 235 48.9 145 25 245 25.5 146 25 255 21.8 147 25 265 31.3 148 25 275 30.0 149 25 285 25.2 150 25 295 22.2 151 25 305 19.7 152 25 315 22.7 153 25 325 25.0 154 25 335 25.3 155 25 345 16.4 160 15 35 9.5 161 15 45 6.7 162 15 55 11.4 163 15 65 11.9 164 15 75 10.2 165 15 85 19.6 166 15 95 17.1 167 15 105 32.9 168 15 115 29.6 169 15 125 30.3 170 15 135 24.8 171 15 145 21.4 172 15 155 19.9 173 15 165 18.1 174 15 175 22.1 175 15 185 23.6 176 15 195 23.6 177 15 205 27.8 178 15 215 29.5 179 15 225 40.9 180 15 235 47.9 181 15 245 33.8 182 15 255 16.7 183 15 265 13.0 184 15 275 18.9 185 15 285 16.1 186 15 295 14.9 187 15 305 13.3 188 15 315 17.9 189 15 325 24.7 190 15 335 21.0 191 15 345 9.3 193 5 5 19.6 197 5 45 12.2 198 5 55 15.8 199 5 65 14.4 200 5 75 18.3 201 5 85 20.9 202 5 95 21.3 203 5 105 28.4 204 5 115 26.5 205 5 125 19.1 206 5 135 15.8 207 5 145 23.1 208 5 155 21.5 209 5 165 17.5 210 5 175 20.5 211 5 185 18.6 212 5 195 21.6 213 5 205 23.1 214 5 215 27.3 215 5 225 31.9 216 5 235 35.0 217 5 245 30.6 218 5 255 34.6 219 5 265 33.5 220 5 275 29.3 221 5 285 24.8 223 5 305 18.4 224 5 315 21.2 225 5 325 21.7 226 5 335 23.2 227 5 345 17.6 228 5 355 21.1 229 -5 5 43.3 230 -5 15 40.3 232 -5 35 18.1 233 -5 45 12.8 234 -5 55 18.6 235 -5 65 14.4 236 -5 75 16.9 237 -5 85 17.6 238 -5 95 19.7 239 -5 105 23.0 240 -5 115 23.1 241 -5 125 15.8 242 -5 135 17.9 243 -5 145 21.4 244 -5 155 19.9 245 -5 165 22.6 246 -5 175 14.9 247 -5 185 16.8 248 -5 195 16.8 249 -5 205 22.2 250 -5 215 16.7 251 -5 225 15.6 252 -5 235 15.7 253 -5 245 24.0 254 -5 255 46.7 255 -5 265 54.8 256 -5 275 43.1 257 -5 285 32.8 260 -5 315 14.3 261 -5 325 12.5 262 -5 335 20.7 263 -5 345 39.2 264 -5 355 49.8 265 -15 5 71.6 266 -15 15 41.2 268 -15 35 17.1 269 -15 45 15.2 270 -15 55 13.2 271 -15 65 14.8 272 -15 75 22.3 273 -15 85 22.9 274 -15 95 28.9 275 -15 105 33.9 276 -15 115 17.5 277 -15 125 15.6 278 -15 135 14.3 279 -15 145 18.2 280 -15 155 17.7 281 -15 165 20.2 282 -15 175 21.0 283 -15 185 19.6 284 -15 195 23.6 285 -15 205 27.3 286 -15 215 22.2 287 -15 225 20.5 288 -15 235 20.8 289 -15 245 20.9 290 -15 255 44.4 291 -15 265 59.8 292 -15 275 59.8 293 -15 285 47.0 297 -15 325 17.3 298 -15 335 30.0 299 -15 345 49.8 300 -15 355 67.7 301 -25 5 63.0 302 -25 15 36.4 304 -25 35 22.1 305 -25 45 26.6 306 -25 55 21.0 307 -25 65 26.0 308 -25 75 30.2 309 -25 85 37.4 310 -25 95 46.6 311 -25 105 45.0 312 -25 115 26.7 316 -25 155 20.8 317 -25 165 26.6 318 -25 175 25.9 319 -25 185 26.9 320 -25 195 30.1 321 -25 205 29.2 322 -25 215 32.6 323 -25 225 21.6 324 -25 235 19.8 325 -25 245 24.2 326 -25 255 41.5 327 -25 265 36.1 328 -25 275 55.5 329 -25 285 60.1 332 -25 315 27.6 333 -25 325 24.4 334 -25 335 29.5 335 -25 345 35.7 336 -25 355 48.1 337 -35 5 45.2 338 -35 15 29.6 339 -35 25 30.0 340 -35 35 31.9 341 -35 45 32.9 342 -35 55 37.5 343 -35 65 43.4 344 -35 75 44.0 345 -35 85 45.4 346 -35 95 52.9 347 -35 105 50.7 348 -35 115 37.7 349 -35 125 43.3 350 -35 135 40.6 351 -35 145 35.0 352 -35 155 34.3 353 -35 165 36.9 354 -35 175 30.5 355 -35 185 33.0 356 -35 195 32.8 357 -35 205 37.0 358 -35 215 39.3 359 -35 225 38.7 360 -35 235 36.0 361 -35 245 44.0 362 -35 255 38.2 363 -35 265 50.7 364 -35 275 54.5 365 -35 285 51.5 367 -35 305 27.9 368 -35 315 32.3 369 -35 325 33.3 370 -35 335 39.9 371 -35 345 36.2 372 -35 355 42.2 373 -45 5 33.1 374 -45 15 39.4 375 -45 25 36.3 376 -45 35 33.9 377 -45 45 41.0 378 -45 55 38.2 379 -45 65 40.2 380 -45 75 46.7 381 -45 85 41.1 382 -45 95 34.5 383 -45 105 39.1 384 -45 115 43.8 385 -45 125 40.6 386 -45 135 46.6 387 -45 145 44.6 388 -45 155 40.5 389 -45 165 43.1 390 -45 175 43.0 391 -45 185 41.0 392 -45 195 35.7 393 -45 205 47.8 394 -45 215 42.8 400 -45 275 50.8 401 -45 285 43.0 402 -45 295 33.7 403 -45 305 32.2 404 -45 315 33.4 405 -45 325 42.4 406 -45 335 38.3 407 -45 345 35.7 408 -45 355 28.3 409 -55 10 39.3 410 -55 30 34.8 411 -55 50 35.1 412 -55 70 38.8 413 -55 90 35.2 414 -55 110 38.4 415 -55 130 49.4 416 -55 150 46.1 417 -55 170 53.5 419 -55 210 39.2 420 -55 230 42.3 421 -55 250 38.0 422 -55 270 38.5 423 -55 290 41.5 424 -55 310 44.8 425 -55 330 47.6 426 -55 350 37.6 427 -65 10 58.4 428 -65 30 44.5 429 -65 50 39.3 430 -65 70 52.2 431 -65 90 48.6 432 -65 110 41.4 433 -65 130 34.0 434 -65 150 38.3 435 -65 170 37.2 436 -65 190 32.7 437 -65 210 32.4 438 -65 230 30.6 439 -65 250 24.4 440 -65 270 52.6 441 -65 290 43.7 442 -65 310 47.3 443 -65 330 56.7 444 -65 350 50.0 449 -75 180 52.5 453 -75 340 55.8