Stratocumulus Frequency of Occurrence (%) March (1954 - 1997) Day, Ship Observations Only Global Average: 28.4 Zonal Averages 17 zones Lat.N Average 85 11.3 75 21.2 65 33.4 55 36.8 45 34.6 35 34.3 25 29.1 15 19.0 5 18.4 -5 16.7 -15 19.5 -25 25.4 -35 35.7 -45 40.5 -55 37.8 -65 45.5 -75 49.6 Grid Box Averages 385 filled boxes Box # Lat.N Lon.E Average 1 85 60 10.5 2 85 180 10.1 3 85 300 14.2 4 75 20 36.8 5 75 60 28.4 6 75 100 7.5 7 75 140 15.6 8 75 180 8.9 9 75 220 21.6 12 75 340 22.8 13 65 10 29.8 14 65 30 34.1 15 65 50 24.7 21 65 170 43.6 22 65 190 34.6 23 65 210 24.6 29 65 330 34.9 30 65 350 33.3 31 55 10 28.4 32 55 30 26.3 38 55 150 36.0 39 55 170 38.9 40 55 190 39.6 41 55 210 37.4 42 55 230 34.0 46 55 310 36.1 47 55 330 36.0 48 55 350 38.9 49 45 5 22.3 50 45 15 26.5 51 45 25 31.7 52 45 35 29.4 53 45 45 25.6 54 45 55 32.6 62 45 135 22.0 63 45 145 30.3 64 45 155 38.0 65 45 165 36.9 66 45 175 35.9 67 45 185 35.2 68 45 195 34.6 69 45 205 37.3 70 45 215 38.2 71 45 225 39.3 72 45 235 34.1 77 45 285 24.4 78 45 295 28.4 79 45 305 33.9 80 45 315 35.4 81 45 325 34.4 82 45 335 35.5 83 45 345 37.4 84 45 355 30.2 85 35 5 22.0 86 35 15 21.9 87 35 25 21.2 88 35 35 19.3 89 35 45 25.8 90 35 55 28.5 96 35 115 13.4 97 35 125 24.0 98 35 135 28.8 99 35 145 34.2 100 35 155 37.2 101 35 165 37.2 102 35 175 36.6 103 35 185 39.1 104 35 195 40.2 105 35 205 41.0 106 35 215 44.0 107 35 225 47.5 108 35 235 38.0 109 35 245 29.4 112 35 275 21.4 113 35 285 28.6 114 35 295 33.0 115 35 305 31.6 116 35 315 30.0 117 35 325 32.5 118 35 335 36.7 119 35 345 32.1 120 35 355 21.1 124 25 35 7.8 125 25 45 21.6 126 25 55 12.0 127 25 65 8.2 128 25 75 9.4 129 25 85 8.9 130 25 95 12.3 131 25 105 49.0 132 25 115 35.9 133 25 125 36.3 134 25 135 32.8 135 25 145 27.9 136 25 155 29.4 137 25 165 30.7 138 25 175 30.9 139 25 185 29.9 140 25 195 29.5 141 25 205 29.6 142 25 215 38.4 143 25 225 45.7 144 25 235 50.9 145 25 245 29.4 146 25 255 18.4 147 25 265 29.6 148 25 275 24.0 149 25 285 23.3 150 25 295 21.0 151 25 305 20.6 152 25 315 22.4 153 25 325 26.7 154 25 335 26.8 155 25 345 16.7 160 15 35 11.1 161 15 45 10.6 162 15 55 7.2 163 15 65 5.5 164 15 75 6.7 165 15 85 7.4 166 15 95 9.0 167 15 105 28.4 168 15 115 18.2 169 15 125 20.0 170 15 135 18.3 171 15 145 17.5 172 15 155 18.3 173 15 165 15.4 174 15 175 17.3 175 15 185 17.9 176 15 195 19.7 177 15 205 23.8 178 15 215 28.7 179 15 225 38.9 180 15 235 44.4 181 15 245 33.8 182 15 255 13.7 183 15 265 8.0 184 15 275 13.5 185 15 285 15.3 186 15 295 14.1 187 15 305 14.4 188 15 315 17.8 189 15 325 26.3 190 15 335 22.0 191 15 345 7.5 193 5 5 19.5 197 5 45 7.3 198 5 55 7.4 199 5 65 7.1 200 5 75 9.7 201 5 85 12.6 202 5 95 17.3 203 5 105 17.0 204 5 115 18.3 205 5 125 18.7 206 5 135 17.9 207 5 145 21.1 208 5 155 21.2 209 5 165 22.1 210 5 175 16.1 211 5 185 21.2 212 5 195 20.5 213 5 205 24.6 214 5 215 25.4 215 5 225 27.1 216 5 235 21.2 217 5 245 18.3 218 5 255 17.0 219 5 265 13.3 220 5 275 16.6 221 5 285 21.9 223 5 305 19.6 224 5 315 24.2 225 5 325 23.2 226 5 335 22.4 227 5 345 14.3 228 5 355 17.1 229 -5 5 20.7 230 -5 15 29.5 232 -5 35 12.8 233 -5 45 9.2 234 -5 55 11.2 235 -5 65 13.0 236 -5 75 13.2 237 -5 85 13.3 238 -5 95 17.4 239 -5 105 19.5 240 -5 115 20.2 241 -5 125 18.4 242 -5 135 17.0 243 -5 145 21.2 244 -5 155 21.3 245 -5 165 19.6 246 -5 175 14.0 247 -5 185 15.9 248 -5 195 15.8 249 -5 205 13.7 250 -5 215 15.2 251 -5 225 15.8 252 -5 235 15.3 253 -5 245 18.8 254 -5 255 20.6 255 -5 265 21.8 256 -5 275 20.2 257 -5 285 22.4 260 -5 315 19.6 261 -5 325 16.6 262 -5 335 16.1 263 -5 345 16.5 264 -5 355 14.6 265 -15 5 48.5 266 -15 15 42.8 268 -15 35 12.6 269 -15 45 13.0 270 -15 55 12.1 271 -15 65 12.1 272 -15 75 14.3 273 -15 85 16.9 274 -15 95 22.5 275 -15 105 19.9 276 -15 115 14.6 277 -15 125 17.5 278 -15 135 19.3 279 -15 145 21.3 280 -15 155 17.3 281 -15 165 20.9 282 -15 175 18.2 283 -15 185 16.2 284 -15 195 16.4 285 -15 205 13.8 286 -15 215 14.1 287 -15 225 12.2 288 -15 235 10.8 289 -15 245 15.6 290 -15 255 20.2 291 -15 265 29.6 292 -15 275 37.6 293 -15 285 32.8 297 -15 325 13.9 298 -15 335 15.0 299 -15 345 17.2 300 -15 355 29.4 301 -25 5 47.0 302 -25 15 36.0 304 -25 35 15.5 305 -25 45 16.5 306 -25 55 16.8 307 -25 65 19.2 308 -25 75 21.5 309 -25 85 25.3 310 -25 95 31.9 311 -25 105 38.4 312 -25 115 20.9 315 -25 145 24.0 316 -25 155 18.4 317 -25 165 21.9 318 -25 175 24.2 319 -25 185 26.4 320 -25 195 25.3 321 -25 205 22.3 322 -25 215 21.5 323 -25 225 18.4 324 -25 235 13.0 325 -25 245 14.4 326 -25 255 18.9 327 -25 265 25.5 328 -25 275 45.9 329 -25 285 58.1 332 -25 315 22.4 333 -25 325 19.1 334 -25 335 20.4 335 -25 345 21.5 336 -25 355 32.0 337 -35 5 42.0 338 -35 15 31.6 339 -35 25 27.3 340 -35 35 25.2 341 -35 45 30.9 342 -35 55 36.2 343 -35 65 36.5 344 -35 75 39.0 345 -35 85 41.7 346 -35 95 44.2 347 -35 105 50.6 348 -35 115 35.6 349 -35 125 46.3 350 -35 135 42.9 351 -35 145 32.1 352 -35 155 28.4 353 -35 165 34.0 354 -35 175 27.7 355 -35 185 30.9 356 -35 195 34.0 357 -35 205 33.3 358 -35 215 37.0 359 -35 225 35.7 360 -35 235 27.2 361 -35 245 33.8 362 -35 255 36.5 363 -35 265 38.9 364 -35 275 44.8 365 -35 285 50.5 367 -35 305 25.3 368 -35 315 26.5 369 -35 325 38.0 370 -35 335 32.4 371 -35 345 31.9 372 -35 355 34.9 373 -45 5 35.1 374 -45 15 44.8 375 -45 25 38.9 376 -45 35 33.0 377 -45 45 39.6 378 -45 55 41.4 379 -45 65 40.1 380 -45 75 43.5 381 -45 85 45.8 382 -45 95 37.9 383 -45 105 42.9 384 -45 115 38.9 385 -45 125 46.9 386 -45 135 46.3 387 -45 145 36.1 388 -45 155 41.2 389 -45 165 46.0 390 -45 175 34.2 391 -45 185 42.5 392 -45 195 43.2 393 -45 205 47.0 394 -45 215 43.2 395 -45 225 40.2 396 -45 235 47.8 397 -45 245 44.0 398 -45 255 35.8 399 -45 265 41.6 400 -45 275 49.5 401 -45 285 51.8 402 -45 295 26.0 403 -45 305 27.9 404 -45 315 36.6 405 -45 325 41.7 406 -45 335 32.8 407 -45 345 36.2 408 -45 355 36.0 409 -55 10 34.8 410 -55 30 29.2 411 -55 50 33.9 412 -55 70 42.5 413 -55 90 33.0 414 -55 110 47.2 415 -55 130 53.4 416 -55 150 43.8 417 -55 170 49.8 418 -55 190 35.9 419 -55 210 33.7 420 -55 230 28.5 421 -55 250 30.4 422 -55 270 38.5 423 -55 290 37.6 424 -55 310 44.4 425 -55 330 36.4 426 -55 350 28.1 427 -65 10 44.8 428 -65 30 40.9 429 -65 50 42.6 430 -65 70 59.0 431 -65 90 56.3 432 -65 110 50.9 433 -65 130 46.6 434 -65 150 46.0 435 -65 170 44.1 436 -65 190 33.5 437 -65 210 35.5 438 -65 230 47.9 439 -65 250 39.2 440 -65 270 50.6 441 -65 290 47.8 442 -65 310 44.5 443 -65 330 49.8 444 -65 350 47.8 449 -75 180 57.5 450 -75 220 48.4 451 -75 260 45.6 453 -75 340 42.1