Stratocumulus Frequency of Occurrence (%) September (1954 - 1997) Day, Ship Observations Only Global Average: 31.2 Zonal Averages 16 zones Lat.N Average 85 36.9 75 42.4 65 40.7 55 37.6 45 34.6 35 27.0 25 19.9 15 19.9 5 22.2 -5 22.7 -15 29.2 -25 34.3 -35 37.8 -45 39.0 -55 43.0 -65 46.3 Grid Box Averages 363 filled boxes Box # Lat.N Lon.E Average 1 85 60 35.5 2 85 180 37.1 3 85 300 38.8 4 75 20 42.0 5 75 60 46.1 6 75 100 40.8 7 75 140 43.9 8 75 180 35.8 9 75 220 38.5 10 75 260 56.7 11 75 300 47.8 12 75 340 42.9 13 65 10 33.8 14 65 30 42.3 15 65 50 41.2 16 65 70 44.6 20 65 150 39.1 21 65 170 48.7 22 65 190 48.9 23 65 210 26.6 24 65 230 42.4 25 65 250 60.0 26 65 270 54.9 27 65 290 46.5 28 65 310 36.0 29 65 330 32.7 30 65 350 37.1 31 55 10 29.0 32 55 30 32.8 37 55 130 30.2 38 55 150 36.6 39 55 170 40.1 40 55 190 42.0 41 55 210 36.7 42 55 230 32.1 44 55 270 42.9 45 55 290 41.0 46 55 310 36.6 47 55 330 37.2 48 55 350 38.6 49 45 5 16.3 50 45 15 17.2 51 45 25 19.2 52 45 35 19.1 53 45 45 19.8 54 45 55 15.2 62 45 135 26.4 63 45 145 31.2 64 45 155 37.1 65 45 165 39.6 66 45 175 40.9 67 45 185 41.7 68 45 195 40.6 69 45 205 37.3 70 45 215 40.0 71 45 225 41.3 72 45 235 33.4 77 45 285 22.4 78 45 295 21.8 79 45 305 28.4 80 45 315 33.0 81 45 325 33.0 82 45 335 33.6 83 45 345 37.4 84 45 355 27.3 85 35 5 15.2 86 35 15 12.2 87 35 25 7.0 88 35 35 7.5 90 35 55 14.6 96 35 115 20.8 97 35 125 23.7 98 35 135 23.4 99 35 145 29.9 100 35 155 31.5 101 35 165 32.3 102 35 175 32.5 103 35 185 32.4 104 35 195 31.3 105 35 205 31.2 106 35 215 37.4 107 35 225 46.7 108 35 235 39.0 109 35 245 38.5 112 35 275 15.7 113 35 285 21.6 114 35 295 20.7 115 35 305 19.7 116 35 315 18.6 117 35 325 20.5 118 35 335 24.8 119 35 345 24.8 120 35 355 14.7 124 25 35 3.2 125 25 45 4.1 126 25 55 6.0 127 25 65 17.8 128 25 75 16.8 129 25 85 19.6 130 25 95 17.4 131 25 105 24.6 132 25 115 23.9 133 25 125 20.5 134 25 135 15.5 135 25 145 14.5 136 25 155 16.0 137 25 165 15.0 138 25 175 16.6 139 25 185 15.4 140 25 195 14.4 141 25 205 19.9 142 25 215 28.8 143 25 225 43.4 144 25 235 52.4 145 25 245 28.4 146 25 255 18.3 147 25 265 16.8 148 25 275 16.4 149 25 285 15.4 150 25 295 12.8 151 25 305 11.9 152 25 315 13.4 153 25 325 17.1 154 25 335 20.9 155 25 345 15.5 160 15 35 6.9 161 15 45 8.8 162 15 55 18.9 163 15 65 19.4 164 15 75 19.2 165 15 85 18.6 166 15 95 21.5 167 15 105 19.3 168 15 115 22.1 169 15 125 21.5 170 15 135 19.0 171 15 145 17.7 172 15 155 17.9 173 15 165 14.1 174 15 175 15.5 175 15 185 17.6 176 15 195 16.1 177 15 205 19.5 178 15 215 24.9 179 15 225 32.4 180 15 235 33.2 181 15 245 23.7 182 15 255 21.3 183 15 265 23.6 184 15 275 20.6 185 15 285 15.0 186 15 295 12.5 187 15 305 13.6 188 15 315 17.1 189 15 325 23.2 190 15 335 21.9 191 15 345 16.9 193 5 5 29.9 197 5 45 11.8 198 5 55 13.4 199 5 65 13.1 200 5 75 17.5 201 5 85 20.2 202 5 95 23.5 203 5 105 21.8 204 5 115 22.0 205 5 125 19.9 206 5 135 19.1 207 5 145 18.9 208 5 155 18.2 209 5 165 16.8 210 5 175 16.4 211 5 185 16.1 212 5 195 17.5 213 5 205 21.4 214 5 215 24.0 215 5 225 25.9 216 5 235 27.9 217 5 245 32.8 218 5 255 36.3 219 5 265 38.8 220 5 275 34.0 221 5 285 31.2 223 5 305 13.3 224 5 315 16.3 225 5 325 15.5 226 5 335 19.9 227 5 345 28.2 228 5 355 33.4 229 -5 5 46.9 230 -5 15 54.1 232 -5 35 18.2 233 -5 45 13.7 234 -5 55 15.3 235 -5 65 16.3 236 -5 75 20.9 237 -5 85 20.1 238 -5 95 19.1 239 -5 105 19.2 240 -5 115 12.0 241 -5 125 11.7 242 -5 135 14.9 243 -5 145 19.1 244 -5 155 21.3 245 -5 165 16.9 246 -5 175 15.9 247 -5 185 15.0 248 -5 195 10.5 249 -5 205 13.8 250 -5 215 13.8 251 -5 225 11.9 252 -5 235 11.4 253 -5 245 22.3 254 -5 255 42.1 255 -5 265 54.9 256 -5 275 55.0 257 -5 285 41.9 260 -5 315 12.9 261 -5 325 12.3 262 -5 335 17.4 263 -5 345 32.2 264 -5 355 44.5 265 -15 5 69.4 266 -15 15 45.4 268 -15 35 14.8 269 -15 45 10.4 270 -15 55 19.1 271 -15 65 22.0 272 -15 75 24.1 273 -15 85 26.4 274 -15 95 24.9 275 -15 105 26.6 276 -15 115 8.8 277 -15 125 6.6 278 -15 135 10.9 279 -15 145 17.5 280 -15 155 19.3 281 -15 165 23.0 282 -15 175 25.9 283 -15 185 22.4 284 -15 195 22.2 285 -15 205 18.4 286 -15 215 17.4 287 -15 225 14.9 288 -15 235 14.4 289 -15 245 26.4 290 -15 255 36.0 291 -15 265 50.3 292 -15 275 70.1 293 -15 285 66.8 297 -15 325 17.5 298 -15 335 31.0 299 -15 345 45.3 300 -15 355 66.7 301 -25 5 56.7 302 -25 15 36.7 304 -25 35 21.3 305 -25 45 20.6 306 -25 55 22.5 307 -25 65 31.9 308 -25 75 35.7 309 -25 85 41.5 310 -25 95 38.0 311 -25 105 38.8 312 -25 115 19.4 315 -25 145 16.0 316 -25 155 16.2 317 -25 165 25.5 318 -25 175 28.1 319 -25 185 29.3 320 -25 195 34.0 321 -25 205 34.4 322 -25 215 32.4 323 -25 225 32.5 324 -25 235 26.9 325 -25 245 24.4 326 -25 255 32.4 327 -25 265 51.6 328 -25 275 55.9 329 -25 285 55.1 332 -25 315 26.4 333 -25 325 26.9 334 -25 335 30.9 335 -25 345 33.2 336 -25 355 47.4 337 -35 5 48.0 338 -35 15 33.5 339 -35 25 28.1 340 -35 35 32.0 341 -35 45 36.2 342 -35 55 39.6 343 -35 65 40.0 344 -35 75 45.4 345 -35 85 48.3 346 -35 95 44.7 347 -35 105 44.3 348 -35 115 35.2 349 -35 125 36.3 350 -35 135 35.3 351 -35 145 33.3 352 -35 155 27.3 353 -35 165 30.0 354 -35 175 29.3 355 -35 185 32.2 356 -35 195 35.9 357 -35 205 36.9 358 -35 215 36.6 359 -35 225 34.5 360 -35 235 33.5 361 -35 245 36.9 362 -35 255 41.3 363 -35 265 44.6 364 -35 275 52.7 365 -35 285 41.2 367 -35 305 27.5 368 -35 315 32.2 369 -35 325 38.0 370 -35 335 37.5 371 -35 345 36.2 372 -35 355 42.2 375 -45 25 29.6 376 -45 35 43.8 377 -45 45 52.8 378 -45 55 38.6 379 -45 65 38.5 380 -45 75 33.1 382 -45 95 35.9 383 -45 105 31.3 384 -45 115 45.8 385 -45 125 40.2 386 -45 135 38.9 387 -45 145 35.8 388 -45 155 32.8 389 -45 165 35.8 390 -45 175 38.4 391 -45 185 37.6 392 -45 195 40.4 393 -45 205 41.1 394 -45 215 38.1 395 -45 225 35.7 397 -45 245 46.9 400 -45 275 56.1 401 -45 285 38.5 402 -45 295 33.4 403 -45 305 31.2 404 -45 315 39.4 405 -45 325 41.5 408 -45 355 38.6 409 -55 10 34.6 411 -55 50 40.9 412 -55 70 50.6 414 -55 110 36.5 416 -55 150 39.4 417 -55 170 55.9 419 -55 210 44.5 420 -55 230 51.2 421 -55 250 45.0 422 -55 270 34.2 423 -55 290 38.6 424 -55 310 47.1 425 -55 330 39.7 432 -65 110 45.6 442 -65 310 46.8