Stratocumulus Frequency of Occurrence (%) January (1954 - 1997) Night, Ship Observations Only Global Average: 31.2 Zonal Averages 17 zones Lat.N Average 85 11.3 75 19.6 65 38.7 55 37.3 45 36.8 35 34.9 25 30.7 15 22.6 5 23.1 -5 21.9 -15 26.7 -25 30.1 -35 37.3 -45 40.7 -55 40.5 -65 42.9 -75 44.8 Grid Box Averages 364 filled boxes Box # Lat.N Lon.E Average 2 85 180 11.3 4 75 20 34.0 5 75 60 27.1 8 75 180 12.5 9 75 220 6.4 13 65 10 28.9 14 65 30 20.8 21 65 170 54.7 22 65 190 51.6 23 65 210 24.7 29 65 330 37.6 30 65 350 36.7 31 55 10 30.0 32 55 30 32.8 38 55 150 36.4 39 55 170 41.7 40 55 190 41.2 41 55 210 39.0 42 55 230 34.1 46 55 310 34.0 47 55 330 34.0 48 55 350 39.6 49 45 5 23.7 50 45 15 33.4 51 45 25 33.2 52 45 35 30.8 62 45 135 27.9 63 45 145 35.3 64 45 155 41.8 65 45 165 40.8 66 45 175 37.4 67 45 185 36.8 68 45 195 36.0 69 45 205 37.3 70 45 215 37.3 71 45 225 41.6 72 45 235 34.0 77 45 285 25.0 78 45 295 36.4 79 45 305 38.4 80 45 315 38.8 81 45 325 33.2 82 45 335 35.0 83 45 345 39.9 84 45 355 32.4 85 35 5 25.6 86 35 15 24.3 87 35 25 24.6 88 35 35 21.2 97 35 125 28.7 98 35 135 32.1 99 35 145 37.6 100 35 155 38.4 101 35 165 36.2 102 35 175 35.5 103 35 185 36.6 104 35 195 36.1 105 35 205 37.9 106 35 215 40.9 107 35 225 47.9 108 35 235 37.8 109 35 245 23.8 112 35 275 27.9 113 35 285 32.6 114 35 295 36.6 115 35 305 33.0 116 35 315 32.5 117 35 325 34.1 118 35 335 35.3 119 35 345 34.9 120 35 355 20.7 124 25 35 8.5 125 25 45 14.5 126 25 55 10.3 127 25 65 8.1 132 25 115 33.8 133 25 125 40.1 134 25 135 40.0 135 25 145 34.4 136 25 155 32.1 137 25 165 32.5 138 25 175 34.3 139 25 185 36.5 140 25 195 31.9 141 25 205 30.2 142 25 215 37.4 143 25 225 45.8 144 25 235 48.1 145 25 245 25.6 146 25 255 23.3 147 25 265 32.3 148 25 275 28.3 149 25 285 25.5 150 25 295 21.3 151 25 305 21.4 152 25 315 23.9 153 25 325 26.2 154 25 335 24.7 155 25 345 15.2 160 15 35 13.3 161 15 45 10.1 162 15 55 13.5 163 15 65 13.9 164 15 75 6.5 165 15 85 12.5 166 15 95 12.3 167 15 105 29.6 168 15 115 28.8 169 15 125 29.6 170 15 135 26.1 171 15 145 28.5 172 15 155 20.5 173 15 165 18.4 174 15 175 23.7 175 15 185 26.5 176 15 195 23.4 177 15 205 24.0 178 15 215 31.3 179 15 225 36.6 180 15 235 43.5 181 15 245 35.2 182 15 255 14.7 183 15 265 10.8 184 15 275 18.5 185 15 285 14.1 186 15 295 13.8 187 15 305 15.2 188 15 315 19.5 189 15 325 30.3 190 15 335 21.5 191 15 345 11.1 193 5 5 16.4 197 5 45 12.6 198 5 55 16.0 199 5 65 14.7 200 5 75 11.9 201 5 85 18.5 202 5 95 20.8 203 5 105 26.0 204 5 115 26.5 205 5 125 26.7 206 5 135 15.2 207 5 145 26.2 208 5 155 23.9 209 5 165 21.0 210 5 175 17.5 211 5 185 25.1 212 5 195 21.8 213 5 205 24.7 214 5 215 27.7 215 5 225 37.7 216 5 235 25.9 217 5 245 33.5 218 5 255 30.4 219 5 265 26.3 220 5 275 22.7 221 5 285 22.7 223 5 305 20.6 224 5 315 26.8 225 5 325 24.0 226 5 335 28.4 227 5 345 13.0 228 5 355 17.4 229 -5 5 34.0 230 -5 15 34.9 233 -5 45 13.4 234 -5 55 16.7 235 -5 65 16.9 236 -5 75 17.0 237 -5 85 19.3 238 -5 95 22.1 239 -5 105 21.9 240 -5 115 26.2 241 -5 125 20.4 242 -5 135 21.0 243 -5 145 25.5 244 -5 155 27.8 245 -5 165 24.4 246 -5 175 20.5 247 -5 185 15.8 248 -5 195 15.3 249 -5 205 11.8 250 -5 215 10.9 251 -5 225 7.7 252 -5 235 10.2 253 -5 245 19.7 254 -5 255 33.3 255 -5 265 42.3 256 -5 275 39.8 257 -5 285 25.3 260 -5 315 22.1 261 -5 325 15.7 262 -5 335 20.6 263 -5 345 28.5 264 -5 355 35.5 265 -15 5 62.0 266 -15 15 39.0 268 -15 35 16.1 269 -15 45 16.5 270 -15 55 15.4 271 -15 65 17.3 272 -15 75 20.0 273 -15 85 22.4 274 -15 95 29.3 275 -15 105 33.9 276 -15 115 25.8 277 -15 125 16.1 278 -15 135 18.5 279 -15 145 28.0 280 -15 155 20.0 281 -15 165 24.8 282 -15 175 19.5 283 -15 185 18.0 284 -15 195 20.8 285 -15 205 17.2 286 -15 215 15.2 287 -15 225 12.9 288 -15 235 17.9 289 -15 245 19.3 290 -15 255 41.0 291 -15 265 46.1 292 -15 275 46.8 293 -15 285 36.0 297 -15 325 14.4 298 -15 335 21.9 299 -15 345 37.4 300 -15 355 53.6 301 -25 5 58.8 302 -25 15 35.5 304 -25 35 18.9 305 -25 45 18.8 306 -25 55 17.1 307 -25 65 22.6 308 -25 75 24.7 309 -25 85 33.8 310 -25 95 50.0 311 -25 105 48.5 312 -25 115 27.7 316 -25 155 21.6 317 -25 165 27.1 318 -25 175 26.2 319 -25 185 27.2 320 -25 195 27.9 321 -25 205 30.6 322 -25 215 27.8 323 -25 225 13.6 324 -25 235 15.7 325 -25 245 16.1 326 -25 255 28.1 327 -25 265 46.7 328 -25 275 49.2 329 -25 285 55.6 332 -25 315 24.0 333 -25 325 17.6 334 -25 335 17.8 335 -25 345 26.1 336 -25 355 38.3 337 -35 5 46.6 338 -35 15 30.0 339 -35 25 33.8 340 -35 35 30.6 341 -35 45 28.0 342 -35 55 34.9 343 -35 65 42.7 344 -35 75 39.7 345 -35 85 44.7 346 -35 95 49.6 347 -35 105 49.7 348 -35 115 33.1 349 -35 125 41.4 350 -35 135 35.2 351 -35 145 27.3 352 -35 155 33.3 353 -35 165 42.5 354 -35 175 32.7 355 -35 185 35.6 356 -35 195 35.3 357 -35 205 35.0 358 -35 215 39.4 359 -35 225 36.2 360 -35 235 35.4 361 -35 245 26.4 362 -35 255 36.0 363 -35 265 53.3 364 -35 275 49.7 365 -35 285 41.3 367 -35 305 23.8 368 -35 315 26.1 369 -35 325 26.7 370 -35 335 36.8 371 -35 345 35.0 372 -35 355 41.3 373 -45 5 39.4 374 -45 15 44.4 375 -45 25 38.5 376 -45 35 32.5 377 -45 45 31.1 378 -45 55 38.3 379 -45 65 39.8 380 -45 75 42.8 381 -45 85 44.5 382 -45 95 36.9 383 -45 105 46.9 384 -45 115 49.5 385 -45 125 48.2 386 -45 135 54.8 387 -45 145 41.6 388 -45 155 40.5 389 -45 165 43.4 390 -45 175 39.6 391 -45 185 34.8 392 -45 195 34.5 393 -45 205 37.5 394 -45 215 45.1 399 -45 265 51.3 400 -45 275 46.4 401 -45 285 45.6 402 -45 295 28.4 403 -45 305 28.1 404 -45 315 32.5 405 -45 325 43.0 406 -45 335 38.2 407 -45 345 39.0 408 -45 355 42.9 409 -55 10 37.4 410 -55 30 40.7 411 -55 50 42.5 412 -55 70 40.2 413 -55 90 38.0 414 -55 110 46.8 415 -55 130 45.7 416 -55 150 45.5 417 -55 170 49.1 418 -55 190 35.8 419 -55 210 34.0 420 -55 230 38.7 421 -55 250 35.5 422 -55 270 37.4 423 -55 290 40.6 424 -55 310 42.9 425 -55 330 42.9 426 -55 350 36.0 427 -65 10 50.9 428 -65 30 39.0 429 -65 50 42.0 430 -65 70 56.7 431 -65 90 54.0 432 -65 110 49.6 433 -65 130 49.6 434 -65 150 43.2 435 -65 170 43.3 436 -65 190 25.8 437 -65 210 26.9 438 -65 230 32.5 439 -65 250 35.7 440 -65 270 40.2 441 -65 290 44.5 442 -65 310 44.7 443 -65 330 52.5 444 -65 350 53.3 449 -75 180 44.4 450 -75 220 29.9 452 -75 300 56.0 453 -75 340 54.4