Stratocumulus Frequency of Occurrence (%) April (1954 - 1997) Day, Ship Observations Only Global Average: 29.1 Zonal Averages 17 zones Lat.N Average 85 10.2 75 21.9 65 34.8 55 37.5 45 34.5 35 33.5 25 27.3 15 19.3 5 18.7 -5 16.6 -15 20.6 -25 27.5 -35 35.5 -45 42.2 -55 43.2 -65 46.5 -75 37.9 Grid Box Averages 377 filled boxes Box # Lat.N Lon.E Average 1 85 60 12.2 2 85 180 9.4 3 85 300 8.6 4 75 20 37.6 5 75 60 24.5 6 75 100 14.8 7 75 140 11.3 8 75 180 13.5 9 75 220 19.6 11 75 300 33.8 12 75 340 22.8 13 65 10 30.2 14 65 30 30.9 15 65 50 25.5 21 65 170 43.2 22 65 190 37.1 23 65 210 27.8 29 65 330 36.2 30 65 350 35.9 31 55 10 24.7 32 55 30 26.8 38 55 150 36.0 39 55 170 39.0 40 55 190 41.3 41 55 210 38.1 42 55 230 34.1 46 55 310 37.8 47 55 330 39.0 48 55 350 38.5 49 45 5 20.3 50 45 15 23.6 51 45 25 25.5 52 45 35 22.9 53 45 45 23.6 54 45 55 25.8 62 45 135 20.4 63 45 145 28.2 64 45 155 34.9 65 45 165 36.4 66 45 175 38.3 67 45 185 40.5 68 45 195 38.5 69 45 205 38.8 70 45 215 39.4 71 45 225 39.7 72 45 235 35.2 77 45 285 22.4 78 45 295 24.3 79 45 305 30.5 80 45 315 33.4 81 45 325 35.2 82 45 335 37.6 83 45 345 36.8 84 45 355 26.6 85 35 5 20.5 86 35 15 19.1 87 35 25 16.7 88 35 35 16.1 89 35 45 33.5 90 35 55 25.5 96 35 115 15.5 97 35 125 21.1 98 35 135 25.3 99 35 145 30.1 100 35 155 35.2 101 35 165 37.9 102 35 175 39.9 103 35 185 41.7 104 35 195 41.8 105 35 205 44.0 106 35 215 46.8 107 35 225 49.9 108 35 235 37.7 109 35 245 32.4 112 35 275 17.8 113 35 285 23.5 114 35 295 28.4 115 35 305 30.1 116 35 315 29.2 117 35 325 30.2 118 35 335 34.7 119 35 345 31.3 120 35 355 19.3 124 25 35 5.8 125 25 45 14.8 126 25 55 9.1 127 25 65 7.8 128 25 75 5.7 129 25 85 16.4 130 25 95 15.6 131 25 105 34.3 132 25 115 32.1 133 25 125 32.2 134 25 135 29.2 135 25 145 23.9 136 25 155 27.5 137 25 165 27.5 138 25 175 28.0 139 25 185 29.7 140 25 195 27.2 141 25 205 28.1 142 25 215 38.1 143 25 225 49.2 144 25 235 50.8 145 25 245 30.7 146 25 255 18.3 147 25 265 22.4 148 25 275 18.1 149 25 285 19.7 150 25 295 18.9 151 25 305 19.6 152 25 315 21.2 153 25 325 23.8 154 25 335 28.6 155 25 345 17.4 160 15 35 6.1 161 15 45 7.9 162 15 55 6.7 163 15 65 5.3 164 15 75 9.6 165 15 85 10.6 166 15 95 10.7 167 15 105 22.0 168 15 115 12.9 169 15 125 15.1 170 15 135 12.9 171 15 145 13.5 172 15 155 14.8 173 15 165 13.5 174 15 175 19.4 175 15 185 20.2 176 15 195 19.3 177 15 205 25.5 178 15 215 33.7 179 15 225 41.6 180 15 235 47.9 181 15 245 36.5 182 15 255 15.1 183 15 265 10.9 184 15 275 14.0 185 15 285 15.9 186 15 295 13.7 187 15 305 14.4 188 15 315 18.5 189 15 325 27.1 190 15 335 26.7 191 15 345 7.1 193 5 5 18.6 197 5 45 8.8 198 5 55 7.8 199 5 65 7.5 200 5 75 12.8 201 5 85 13.9 202 5 95 17.6 203 5 105 12.6 204 5 115 12.8 205 5 125 14.0 206 5 135 15.9 207 5 145 18.9 208 5 155 19.8 209 5 165 21.8 210 5 175 19.0 211 5 185 20.7 212 5 195 22.4 213 5 205 24.2 214 5 215 31.1 215 5 225 24.6 216 5 235 24.5 217 5 245 16.5 218 5 255 15.0 219 5 265 15.6 220 5 275 21.6 221 5 285 23.4 223 5 305 19.7 224 5 315 24.7 225 5 325 24.0 226 5 335 24.0 227 5 345 17.7 228 5 355 18.5 229 -5 5 24.5 230 -5 15 33.0 232 -5 35 14.0 233 -5 45 10.4 234 -5 55 10.0 235 -5 65 9.8 236 -5 75 13.3 237 -5 85 13.8 238 -5 95 19.1 239 -5 105 18.8 240 -5 115 20.0 241 -5 125 12.9 242 -5 135 14.2 243 -5 145 20.6 244 -5 155 20.2 245 -5 165 21.8 246 -5 175 17.5 247 -5 185 12.5 248 -5 195 14.7 249 -5 205 16.0 250 -5 215 15.1 251 -5 225 14.6 252 -5 235 13.0 253 -5 245 16.3 254 -5 255 19.2 255 -5 265 22.5 256 -5 275 20.9 257 -5 285 32.7 260 -5 315 18.1 261 -5 325 16.3 262 -5 335 16.5 263 -5 345 16.8 264 -5 355 19.7 265 -15 5 50.0 266 -15 15 41.0 268 -15 35 14.4 269 -15 45 12.9 270 -15 55 13.3 271 -15 65 15.2 272 -15 75 13.8 273 -15 85 19.1 274 -15 95 21.7 275 -15 105 18.9 276 -15 115 11.0 277 -15 125 11.3 278 -15 135 17.3 279 -15 145 23.4 280 -15 155 20.6 281 -15 165 21.4 282 -15 175 18.8 283 -15 185 19.1 284 -15 195 17.1 285 -15 205 14.7 286 -15 215 11.3 287 -15 225 11.3 288 -15 235 13.7 289 -15 245 15.0 290 -15 255 22.9 291 -15 265 32.2 292 -15 275 42.2 293 -15 285 39.8 297 -15 325 15.4 298 -15 335 15.3 299 -15 345 17.7 300 -15 355 37.5 301 -25 5 47.7 302 -25 15 33.6 304 -25 35 16.1 305 -25 45 19.1 306 -25 55 19.6 307 -25 65 20.4 308 -25 75 25.3 309 -25 85 29.3 310 -25 95 30.9 311 -25 105 33.6 312 -25 115 21.6 315 -25 145 21.0 316 -25 155 18.3 317 -25 165 23.0 318 -25 175 25.4 319 -25 185 27.8 320 -25 195 29.3 321 -25 205 30.7 322 -25 215 26.2 323 -25 225 20.1 324 -25 235 17.5 325 -25 245 17.0 326 -25 255 21.6 327 -25 265 29.5 328 -25 275 47.0 329 -25 285 60.6 332 -25 315 23.6 333 -25 325 20.2 334 -25 335 23.7 335 -25 345 25.2 336 -25 355 33.2 337 -35 5 43.7 338 -35 15 32.6 339 -35 25 25.7 340 -35 35 23.3 341 -35 45 31.6 342 -35 55 34.4 343 -35 65 33.7 344 -35 75 42.0 345 -35 85 42.1 346 -35 95 48.2 347 -35 105 45.1 348 -35 115 35.1 349 -35 125 41.5 350 -35 135 41.6 351 -35 145 34.4 352 -35 155 28.7 353 -35 165 32.8 354 -35 175 30.7 355 -35 185 31.0 356 -35 195 34.4 357 -35 205 34.4 358 -35 215 36.6 359 -35 225 37.0 360 -35 235 29.7 361 -35 245 31.5 362 -35 255 41.2 363 -35 265 39.3 364 -35 275 37.1 365 -35 285 41.4 367 -35 305 28.4 368 -35 315 27.5 369 -35 325 35.9 370 -35 335 33.8 371 -35 345 36.0 372 -35 355 34.8 373 -45 5 37.2 374 -45 15 43.4 375 -45 25 53.8 376 -45 35 48.0 377 -45 45 43.7 378 -45 55 35.9 379 -45 65 39.8 380 -45 75 48.5 381 -45 85 54.0 382 -45 95 43.2 383 -45 105 39.5 384 -45 115 38.1 385 -45 125 45.8 386 -45 135 47.5 387 -45 145 36.8 388 -45 155 40.8 389 -45 165 38.1 390 -45 175 38.9 391 -45 185 40.2 392 -45 195 43.8 393 -45 205 47.7 394 -45 215 47.4 395 -45 225 47.1 396 -45 235 49.6 397 -45 245 39.0 398 -45 255 46.4 399 -45 265 43.9 400 -45 275 47.7 401 -45 285 54.3 402 -45 295 32.8 403 -45 305 29.7 404 -45 315 33.7 405 -45 325 43.4 406 -45 335 37.1 407 -45 345 32.2 408 -45 355 31.1 409 -55 10 34.8 410 -55 30 41.9 411 -55 50 38.1 412 -55 70 52.3 413 -55 90 55.0 414 -55 110 40.4 416 -55 150 43.0 417 -55 170 53.5 419 -55 210 55.5 420 -55 230 36.1 421 -55 250 42.9 422 -55 270 31.7 423 -55 290 38.4 424 -55 310 43.7 425 -55 330 41.2 426 -55 350 41.7 427 -65 10 40.0 428 -65 30 40.8 429 -65 50 39.0 430 -65 70 57.6 431 -65 90 63.4 432 -65 110 45.1 433 -65 130 46.5 434 -65 150 42.5 435 -65 170 55.9 440 -65 270 37.5 441 -65 290 50.5 442 -65 310 38.6 443 -65 330 38.3 444 -65 350 61.0 450 -75 220 37.9