Stratocumulus Frequency of Occurrence (%) March, April, May (1954 - 1997) , Ship Observations Only Global Average: 29.9 Zonal Averages 17 zones Lat.N Average 85 19.2 75 29.7 65 36.4 55 38.1 45 35.5 35 34.5 25 28.9 15 20.8 5 20.2 -5 17.6 -15 22.2 -25 28.7 -35 35.4 -45 40.8 -55 39.7 -65 45.3 -75 46.1 Grid Box Averages 399 filled boxes Box # Lat.N Lon.E Average 1 85 60 23.1 2 85 180 16.9 3 85 300 17.1 4 75 20 40.4 5 75 60 33.5 6 75 100 23.3 7 75 140 19.7 8 75 180 21.1 9 75 220 27.2 10 75 260 47.2 11 75 300 42.2 12 75 340 24.2 13 65 10 31.8 14 65 30 36.6 15 65 50 31.4 16 65 70 21.4 20 65 150 29.3 21 65 170 46.9 22 65 190 41.4 23 65 210 32.2 26 65 270 31.0 27 65 290 35.6 29 65 330 39.0 30 65 350 36.5 31 55 10 26.2 32 55 30 25.3 37 55 130 35.2 38 55 150 35.1 39 55 170 41.6 40 55 190 42.1 41 55 210 39.4 42 55 230 35.2 44 55 270 37.6 45 55 290 27.4 46 55 310 38.4 47 55 330 38.9 48 55 350 40.0 49 45 5 20.6 50 45 15 22.6 51 45 25 25.6 52 45 35 24.6 53 45 45 23.8 54 45 55 23.5 61 45 125 23.8 62 45 135 20.4 63 45 145 28.7 64 45 155 35.8 65 45 165 37.1 66 45 175 39.5 67 45 185 40.5 68 45 195 40.3 69 45 205 40.4 70 45 215 41.3 71 45 225 42.3 72 45 235 36.8 77 45 285 22.6 78 45 295 24.1 79 45 305 29.6 80 45 315 34.0 81 45 325 36.6 82 45 335 38.3 83 45 345 38.7 84 45 355 29.2 85 35 5 21.3 86 35 15 18.9 87 35 25 16.8 88 35 35 15.6 89 35 45 33.3 90 35 55 20.8 96 35 115 18.9 97 35 125 22.1 98 35 135 26.0 99 35 145 31.7 100 35 155 37.2 101 35 165 40.0 102 35 175 40.6 103 35 185 42.2 104 35 195 42.7 105 35 205 43.4 106 35 215 46.7 107 35 225 51.9 108 35 235 39.4 109 35 245 34.8 112 35 275 18.4 113 35 285 24.3 114 35 295 29.1 115 35 305 30.0 116 35 315 29.6 117 35 325 31.7 118 35 335 36.9 119 35 345 34.5 120 35 355 21.0 124 25 35 5.9 125 25 45 15.0 126 25 55 8.2 127 25 65 7.7 128 25 75 10.6 129 25 85 17.9 130 25 95 19.2 131 25 105 41.6 132 25 115 31.8 133 25 125 34.0 134 25 135 32.2 135 25 145 26.9 136 25 155 28.7 137 25 165 30.4 138 25 175 30.5 139 25 185 29.9 140 25 195 28.0 141 25 205 29.1 142 25 215 39.4 143 25 225 50.4 144 25 235 54.5 145 25 245 32.6 146 25 255 19.5 147 25 265 24.6 148 25 275 19.5 149 25 285 21.2 150 25 295 20.0 151 25 305 19.4 152 25 315 21.4 153 25 325 26.0 154 25 335 30.4 155 25 345 21.1 156 25 355 25.7 160 15 35 6.8 161 15 45 8.1 162 15 55 7.4 163 15 65 7.0 164 15 75 10.2 165 15 85 12.7 166 15 95 12.6 167 15 105 22.5 168 15 115 15.7 169 15 125 18.1 170 15 135 15.3 171 15 145 15.6 172 15 155 16.6 173 15 165 16.1 174 15 175 19.9 175 15 185 21.1 176 15 195 21.3 177 15 205 25.4 178 15 215 33.4 179 15 225 43.3 180 15 235 49.8 181 15 245 37.6 182 15 255 16.9 183 15 265 13.2 184 15 275 15.3 185 15 285 17.4 186 15 295 14.8 187 15 305 15.0 188 15 315 20.8 189 15 325 30.1 190 15 335 27.4 191 15 345 8.8 193 5 5 20.4 197 5 45 9.2 198 5 55 9.1 199 5 65 9.4 200 5 75 13.7 201 5 85 15.5 202 5 95 18.4 203 5 105 15.4 204 5 115 16.1 205 5 125 17.1 206 5 135 17.4 207 5 145 21.2 208 5 155 22.5 209 5 165 22.6 210 5 175 19.3 211 5 185 19.7 212 5 195 22.1 213 5 205 25.4 214 5 215 31.1 215 5 225 26.4 216 5 235 24.9 217 5 245 21.3 218 5 255 20.5 219 5 265 20.5 220 5 275 22.8 221 5 285 24.3 222 5 295 23.6 223 5 305 20.8 224 5 315 24.7 225 5 325 24.1 226 5 335 24.8 227 5 345 17.3 228 5 355 19.4 229 -5 5 26.2 230 -5 15 28.8 232 -5 35 16.4 233 -5 45 10.9 234 -5 55 11.5 235 -5 65 12.8 236 -5 75 14.2 237 -5 85 14.1 238 -5 95 19.0 239 -5 105 19.0 240 -5 115 18.7 241 -5 125 15.7 242 -5 135 16.6 243 -5 145 21.1 244 -5 155 22.2 245 -5 165 18.6 246 -5 175 16.7 247 -5 185 13.2 248 -5 195 15.1 249 -5 205 14.4 250 -5 215 14.8 251 -5 225 15.9 252 -5 235 13.7 253 -5 245 18.8 254 -5 255 21.6 255 -5 265 26.2 256 -5 275 27.0 257 -5 285 28.2 260 -5 315 20.2 261 -5 325 17.0 262 -5 335 16.6 263 -5 345 17.1 264 -5 355 22.3 265 -15 5 54.3 266 -15 15 40.7 268 -15 35 12.5 269 -15 45 11.9 270 -15 55 14.3 271 -15 65 15.3 272 -15 75 16.0 273 -15 85 20.0 274 -15 95 23.3 275 -15 105 20.0 276 -15 115 12.6 277 -15 125 12.6 278 -15 135 17.2 279 -15 145 22.9 280 -15 155 20.9 281 -15 165 22.0 282 -15 175 22.1 283 -15 185 19.8 284 -15 195 18.1 285 -15 205 15.6 286 -15 215 13.6 287 -15 225 12.7 288 -15 235 12.5 289 -15 245 16.6 290 -15 255 24.3 291 -15 265 40.2 292 -15 275 47.1 293 -15 285 39.5 297 -15 325 14.6 298 -15 335 16.1 299 -15 345 20.2 300 -15 355 41.4 301 -25 5 51.2 302 -25 15 32.7 304 -25 35 14.7 305 -25 45 18.4 306 -25 55 20.0 307 -25 65 24.2 308 -25 75 26.7 309 -25 85 32.1 310 -25 95 34.2 311 -25 105 34.3 312 -25 115 20.3 315 -25 145 21.5 316 -25 155 19.0 317 -25 165 24.4 318 -25 175 27.1 319 -25 185 28.3 320 -25 195 28.5 321 -25 205 27.4 322 -25 215 26.1 323 -25 225 23.7 324 -25 235 19.0 325 -25 245 19.7 326 -25 255 22.5 327 -25 265 34.7 328 -25 275 49.8 329 -25 285 57.8 332 -25 315 23.5 333 -25 325 20.7 334 -25 335 24.0 335 -25 345 25.6 336 -25 355 36.1 337 -35 5 44.3 338 -35 15 31.4 339 -35 25 24.9 340 -35 35 23.4 341 -35 45 31.0 342 -35 55 35.8 343 -35 65 36.5 344 -35 75 39.7 345 -35 85 43.9 346 -35 95 46.5 347 -35 105 45.1 348 -35 115 33.6 349 -35 125 40.4 350 -35 135 39.9 351 -35 145 32.8 352 -35 155 27.6 353 -35 165 34.6 354 -35 175 30.7 355 -35 185 32.6 356 -35 195 33.8 357 -35 205 32.4 358 -35 215 36.9 359 -35 225 37.0 360 -35 235 31.0 361 -35 245 29.3 362 -35 255 37.9 363 -35 265 38.6 364 -35 275 44.3 365 -35 285 44.9 366 -35 295 30.5 367 -35 305 25.9 368 -35 315 26.9 369 -35 325 32.8 370 -35 335 33.6 371 -35 345 34.4 372 -35 355 37.3 373 -45 5 39.8 374 -45 15 41.7 375 -45 25 43.6 376 -45 35 37.6 377 -45 45 40.4 378 -45 55 42.4 379 -45 65 42.6 380 -45 75 42.4 381 -45 85 49.5 382 -45 95 42.0 383 -45 105 39.1 384 -45 115 36.6 385 -45 125 45.4 386 -45 135 45.7 387 -45 145 36.7 388 -45 155 40.1 389 -45 165 43.0 390 -45 175 37.7 391 -45 185 41.3 392 -45 195 42.5 393 -45 205 43.0 394 -45 215 45.6 395 -45 225 41.4 396 -45 235 43.5 397 -45 245 39.2 398 -45 255 42.6 399 -45 265 45.7 400 -45 275 48.8 401 -45 285 50.5 402 -45 295 29.5 403 -45 305 32.1 404 -45 315 35.1 405 -45 325 38.2 406 -45 335 38.3 407 -45 345 31.7 408 -45 355 33.5 409 -55 10 35.8 410 -55 30 33.2 411 -55 50 35.0 412 -55 70 44.1 413 -55 90 40.1 414 -55 110 42.6 415 -55 130 47.0 416 -55 150 42.4 417 -55 170 53.7 418 -55 190 39.9 419 -55 210 43.0 420 -55 230 29.8 421 -55 250 33.9 422 -55 270 38.0 423 -55 290 39.4 424 -55 310 43.6 425 -55 330 39.6 426 -55 350 34.1 427 -65 10 41.8 428 -65 30 40.5 429 -65 50 41.6 430 -65 70 54.5 431 -65 90 55.7 432 -65 110 51.5 433 -65 130 43.7 434 -65 150 42.8 435 -65 170 45.1 436 -65 190 33.7 437 -65 210 36.6 438 -65 230 52.8 439 -65 250 39.8 440 -65 270 51.5 441 -65 290 48.4 442 -65 310 42.9 443 -65 330 46.5 444 -65 350 52.3 449 -75 180 56.8 450 -75 220 48.1 451 -75 260 37.5 452 -75 300 36.4 453 -75 340 42.2