Stratocumulus Frequency of Occurrence (%) December, January, February (1954 - 1997) Night, Ship Observations Only Global Average: 31.4 Zonal Averages 17 zones Lat.N Average 85 10.7 75 20.8 65 38.8 55 37.5 45 36.7 35 34.9 25 30.4 15 22.2 5 22.7 -5 22.3 -15 26.7 -25 30.8 -35 38.3 -45 40.6 -55 40.8 -65 42.6 -75 46.1 Grid Box Averages 385 filled boxes Box # Lat.N Lon.E Average 1 85 60 11.4 2 85 180 10.8 3 85 300 9.8 4 75 20 33.9 5 75 60 30.6 7 75 140 7.3 8 75 180 11.0 9 75 220 14.2 12 75 340 31.8 13 65 10 30.1 14 65 30 29.6 15 65 50 27.7 21 65 170 52.9 22 65 190 52.1 23 65 210 20.2 27 65 290 39.7 29 65 330 39.3 30 65 350 35.3 31 55 10 30.1 32 55 30 36.5 38 55 150 36.5 39 55 170 41.1 40 55 190 41.1 41 55 210 37.2 42 55 230 32.9 46 55 310 35.3 47 55 330 35.7 48 55 350 40.8 49 45 5 25.6 50 45 15 31.2 51 45 25 31.1 52 45 35 32.1 53 45 45 27.2 54 45 55 35.1 62 45 135 25.9 63 45 145 35.2 64 45 155 42.4 65 45 165 40.9 66 45 175 38.5 67 45 185 38.2 68 45 195 35.0 69 45 205 35.4 70 45 215 36.3 71 45 225 39.8 72 45 235 33.7 77 45 285 26.8 78 45 295 36.5 79 45 305 38.3 80 45 315 38.5 81 45 325 34.5 82 45 335 36.1 83 45 345 39.5 84 45 355 32.1 85 35 5 24.9 86 35 15 23.7 87 35 25 23.1 88 35 35 19.2 90 35 55 25.8 96 35 115 9.7 97 35 125 29.6 98 35 135 30.4 99 35 145 36.8 100 35 155 39.5 101 35 165 38.3 102 35 175 37.4 103 35 185 38.6 104 35 195 37.2 105 35 205 37.5 106 35 215 40.8 107 35 225 47.2 108 35 235 37.2 109 35 245 23.7 112 35 275 28.6 113 35 285 31.4 114 35 295 35.1 115 35 305 32.7 116 35 315 31.5 117 35 325 33.7 118 35 335 36.2 119 35 345 34.1 120 35 355 22.4 124 25 35 7.4 125 25 45 13.8 126 25 55 9.7 127 25 65 7.1 128 25 75 5.4 129 25 85 12.4 130 25 95 9.1 131 25 105 34.9 132 25 115 34.5 133 25 125 39.7 134 25 135 40.5 135 25 145 34.8 136 25 155 32.6 137 25 165 31.9 138 25 175 32.9 139 25 185 34.4 140 25 195 30.4 141 25 205 29.9 142 25 215 36.6 143 25 225 46.8 144 25 235 49.1 145 25 245 24.8 146 25 255 20.2 147 25 265 31.2 148 25 275 28.5 149 25 285 25.2 150 25 295 21.8 151 25 305 21.1 152 25 315 24.3 153 25 325 26.4 154 25 335 25.8 155 25 345 16.4 160 15 35 12.3 161 15 45 9.3 162 15 55 11.8 163 15 65 11.9 164 15 75 7.5 165 15 85 14.3 166 15 95 13.0 167 15 105 31.5 168 15 115 27.1 169 15 125 29.0 170 15 135 25.0 171 15 145 24.9 172 15 155 20.1 173 15 165 18.5 174 15 175 21.9 175 15 185 24.2 176 15 195 21.9 177 15 205 25.3 178 15 215 29.8 179 15 225 39.0 180 15 235 46.3 181 15 245 33.6 182 15 255 15.9 183 15 265 11.5 184 15 275 17.8 185 15 285 15.5 186 15 295 14.4 187 15 305 14.9 188 15 315 19.7 189 15 325 28.4 190 15 335 21.0 191 15 345 9.8 193 5 5 17.5 197 5 45 11.7 198 5 55 15.6 199 5 65 13.0 200 5 75 13.9 201 5 85 18.8 202 5 95 19.8 203 5 105 25.7 204 5 115 25.5 205 5 125 22.3 206 5 135 15.9 207 5 145 25.4 208 5 155 22.2 209 5 165 17.9 210 5 175 21.4 211 5 185 22.1 212 5 195 22.3 213 5 205 24.8 214 5 215 28.0 215 5 225 34.5 216 5 235 32.8 217 5 245 31.3 218 5 255 29.2 219 5 265 27.0 220 5 275 23.5 221 5 285 22.9 223 5 305 19.8 224 5 315 24.9 225 5 325 23.4 226 5 335 25.8 227 5 345 14.7 228 5 355 18.8 229 -5 5 34.4 230 -5 15 32.8 232 -5 35 20.8 233 -5 45 12.8 234 -5 55 16.6 235 -5 65 15.9 236 -5 75 17.2 237 -5 85 17.6 238 -5 95 21.8 239 -5 105 22.7 240 -5 115 25.6 241 -5 125 19.1 242 -5 135 19.8 243 -5 145 22.9 244 -5 155 24.3 245 -5 165 22.7 246 -5 175 18.3 247 -5 185 16.4 248 -5 195 16.7 249 -5 205 17.5 250 -5 215 15.5 251 -5 225 14.1 252 -5 235 12.9 253 -5 245 21.1 254 -5 255 35.8 255 -5 265 43.3 256 -5 275 38.1 257 -5 285 26.9 260 -5 315 20.7 261 -5 325 14.7 262 -5 335 19.4 263 -5 345 30.1 264 -5 355 36.6 265 -15 5 62.6 266 -15 15 41.5 268 -15 35 16.7 269 -15 45 15.8 270 -15 55 14.2 271 -15 65 16.1 272 -15 75 21.8 273 -15 85 22.0 274 -15 95 27.5 275 -15 105 32.0 276 -15 115 19.8 277 -15 125 17.6 278 -15 135 16.4 279 -15 145 23.0 280 -15 155 19.5 281 -15 165 22.1 282 -15 175 20.9 283 -15 185 17.8 284 -15 195 20.7 285 -15 205 20.1 286 -15 215 18.0 287 -15 225 14.8 288 -15 235 16.5 289 -15 245 18.0 290 -15 255 39.1 291 -15 265 47.7 292 -15 275 48.4 293 -15 285 37.3 297 -15 325 15.2 298 -15 335 25.1 299 -15 345 39.2 300 -15 355 54.6 301 -25 5 60.5 302 -25 15 37.3 304 -25 35 19.1 305 -25 45 22.1 306 -25 55 19.0 307 -25 65 23.3 308 -25 75 26.7 309 -25 85 33.9 310 -25 95 46.8 311 -25 105 45.5 312 -25 115 27.1 315 -25 145 17.3 316 -25 155 21.0 317 -25 165 26.7 318 -25 175 25.5 319 -25 185 26.9 320 -25 195 28.6 321 -25 205 27.3 322 -25 215 26.8 323 -25 225 17.6 324 -25 235 16.6 325 -25 245 19.1 326 -25 255 32.9 327 -25 265 39.5 328 -25 275 51.6 329 -25 285 55.6 332 -25 315 24.6 333 -25 325 19.5 334 -25 335 22.8 335 -25 345 28.7 336 -25 355 41.8 337 -35 5 47.1 338 -35 15 31.3 339 -35 25 32.0 340 -35 35 31.0 341 -35 45 30.3 342 -35 55 35.2 343 -35 65 40.8 344 -35 75 42.1 345 -35 85 45.3 346 -35 95 51.5 347 -35 105 50.4 348 -35 115 35.1 349 -35 125 43.4 350 -35 135 39.0 351 -35 145 30.9 352 -35 155 33.5 353 -35 165 39.9 354 -35 175 32.0 355 -35 185 34.9 356 -35 195 34.9 357 -35 205 35.9 358 -35 215 38.7 359 -35 225 37.2 360 -35 235 35.3 361 -35 245 33.9 362 -35 255 37.9 363 -35 265 50.1 364 -35 275 51.6 365 -35 285 45.5 367 -35 305 25.4 368 -35 315 27.2 369 -35 325 31.2 370 -35 335 36.2 371 -35 345 37.9 372 -35 355 41.1 373 -45 5 36.4 374 -45 15 43.9 375 -45 25 37.6 376 -45 35 33.6 377 -45 45 36.9 378 -45 55 36.4 379 -45 65 40.4 380 -45 75 45.3 381 -45 85 42.9 382 -45 95 40.1 383 -45 105 41.8 384 -45 115 45.5 385 -45 125 44.7 386 -45 135 49.5 387 -45 145 42.3 388 -45 155 40.1 389 -45 165 43.3 390 -45 175 40.0 391 -45 185 40.2 392 -45 195 37.0 393 -45 205 46.3 394 -45 215 44.4 395 -45 225 42.6 396 -45 235 42.0 397 -45 245 48.0 398 -45 255 34.4 399 -45 265 44.6 400 -45 275 49.2 401 -45 285 45.7 402 -45 295 29.7 403 -45 305 29.1 404 -45 315 33.0 405 -45 325 42.5 406 -45 335 36.8 407 -45 345 38.1 408 -45 355 36.2 409 -55 10 38.2 410 -55 30 36.6 411 -55 50 38.5 412 -55 70 39.8 413 -55 90 37.2 414 -55 110 42.7 415 -55 130 47.0 416 -55 150 45.3 417 -55 170 51.2 418 -55 190 35.8 419 -55 210 36.6 420 -55 230 44.2 421 -55 250 40.1 422 -55 270 37.8 423 -55 290 40.7 424 -55 310 43.1 425 -55 330 44.4 426 -55 350 35.3 427 -65 10 48.1 428 -65 30 41.5 429 -65 50 43.3 430 -65 70 54.2 431 -65 90 52.7 432 -65 110 47.6 433 -65 130 43.4 434 -65 150 40.8 435 -65 170 40.1 436 -65 190 28.7 437 -65 210 29.7 438 -65 230 33.4 439 -65 250 33.1 440 -65 270 44.9 441 -65 290 44.8 442 -65 310 44.7 443 -65 330 51.4 444 -65 350 52.5 449 -75 180 47.5 450 -75 220 33.4 451 -75 260 47.5 452 -75 300 52.1 453 -75 340 53.9