Stratocumulus Frequency of Occurrence (%) April (1954 - 1997) Night, Ship Observations Only Global Average: 30.2 Zonal Averages 16 zones Lat.N Average 85 13.7 75 22.3 65 37.3 55 39.7 45 36.6 35 35.8 25 30.5 15 21.5 5 21.3 -5 18.9 -15 23.2 -25 29.7 -35 35.2 -45 40.6 -55 43.6 -65 38.2 Grid Box Averages 330 filled boxes Box # Lat.N Lon.E Average 1 85 60 17.0 2 85 180 7.4 3 85 300 18.3 4 75 20 38.3 5 75 60 26.2 7 75 140 10.4 8 75 180 15.9 9 75 220 20.0 12 75 340 21.7 13 65 10 32.8 14 65 30 34.2 15 65 50 27.3 21 65 170 45.8 22 65 190 39.1 23 65 210 30.9 29 65 330 39.8 30 65 350 37.7 31 55 10 26.8 32 55 30 29.5 38 55 150 35.5 39 55 170 43.2 40 55 190 42.9 41 55 210 41.2 42 55 230 34.0 46 55 310 39.8 47 55 330 41.4 48 55 350 41.5 49 45 5 21.4 50 45 15 24.7 51 45 25 27.5 52 45 35 23.8 53 45 45 26.8 54 45 55 15.1 62 45 135 16.4 63 45 145 27.3 64 45 155 37.8 65 45 165 38.8 66 45 175 41.4 67 45 185 43.2 68 45 195 41.9 69 45 205 43.5 70 45 215 42.4 71 45 225 42.5 72 45 235 36.3 77 45 285 24.7 78 45 295 24.4 79 45 305 29.2 80 45 315 33.4 81 45 325 36.8 82 45 335 40.9 83 45 345 41.8 84 45 355 30.0 85 35 5 22.6 86 35 15 20.4 87 35 25 17.2 88 35 35 16.4 97 35 125 21.0 98 35 135 23.6 99 35 145 31.6 100 35 155 37.6 101 35 165 43.7 102 35 175 44.2 103 35 185 44.8 104 35 195 45.0 105 35 205 47.4 106 35 215 49.7 107 35 225 53.7 108 35 235 38.8 109 35 245 34.4 112 35 275 18.8 113 35 285 23.8 114 35 295 29.5 115 35 305 31.2 116 35 315 30.2 117 35 325 31.5 118 35 335 37.0 119 35 345 36.2 120 35 355 23.6 124 25 35 5.2 125 25 45 9.2 126 25 55 7.6 127 25 65 7.5 129 25 85 20.8 132 25 115 30.2 133 25 125 35.3 134 25 135 33.4 135 25 145 27.8 136 25 155 31.0 137 25 165 35.9 138 25 175 33.5 139 25 185 33.3 140 25 195 31.6 141 25 205 32.5 142 25 215 43.2 143 25 225 53.5 144 25 235 53.7 145 25 245 28.5 146 25 255 16.6 147 25 265 25.3 148 25 275 18.9 149 25 285 21.5 150 25 295 20.1 151 25 305 20.3 152 25 315 23.3 153 25 325 28.2 154 25 335 32.5 155 25 345 23.0 160 15 35 5.5 161 15 45 7.5 162 15 55 6.4 163 15 65 5.6 164 15 75 8.7 165 15 85 12.7 166 15 95 12.1 167 15 105 22.9 168 15 115 13.8 169 15 125 18.8 170 15 135 16.5 171 15 145 17.6 172 15 155 14.6 173 15 165 18.9 174 15 175 21.5 175 15 185 24.1 176 15 195 20.9 177 15 205 28.3 178 15 215 36.3 179 15 225 42.9 180 15 235 52.1 181 15 245 37.1 182 15 255 18.6 183 15 265 13.4 184 15 275 13.9 185 15 285 17.0 186 15 295 14.2 187 15 305 15.4 188 15 315 23.0 189 15 325 31.1 190 15 335 29.6 191 15 345 7.6 193 5 5 20.9 197 5 45 7.4 198 5 55 6.6 199 5 65 7.8 200 5 75 14.7 201 5 85 15.1 202 5 95 17.2 203 5 105 13.0 204 5 115 13.7 205 5 125 15.4 206 5 135 16.1 207 5 145 21.4 208 5 155 24.8 209 5 165 25.5 210 5 175 16.9 211 5 185 22.6 212 5 195 24.7 213 5 205 30.7 214 5 215 43.6 215 5 225 33.9 216 5 235 30.9 217 5 245 14.6 218 5 255 23.0 219 5 265 20.0 220 5 275 22.7 221 5 285 22.4 223 5 305 20.7 224 5 315 26.1 225 5 325 27.2 226 5 335 27.9 227 5 345 15.7 228 5 355 19.3 229 -5 5 27.8 230 -5 15 29.4 233 -5 45 9.9 234 -5 55 9.8 235 -5 65 13.9 236 -5 75 14.1 237 -5 85 13.1 238 -5 95 19.3 239 -5 105 21.2 240 -5 115 19.5 241 -5 125 15.5 242 -5 135 14.7 243 -5 145 20.8 244 -5 155 23.2 245 -5 165 20.9 246 -5 175 20.6 247 -5 185 12.6 248 -5 195 14.8 249 -5 205 11.4 250 -5 215 23.2 251 -5 225 18.9 252 -5 235 14.7 253 -5 245 22.6 254 -5 255 23.0 255 -5 265 29.9 256 -5 275 30.2 260 -5 315 20.4 261 -5 325 16.7 262 -5 335 17.8 263 -5 345 18.6 264 -5 355 26.1 265 -15 5 62.3 266 -15 15 43.3 268 -15 35 12.7 269 -15 45 12.6 270 -15 55 17.1 271 -15 65 18.5 272 -15 75 20.2 273 -15 85 21.4 274 -15 95 25.8 275 -15 105 18.2 276 -15 115 8.6 277 -15 125 10.7 278 -15 135 12.8 279 -15 145 22.4 280 -15 155 21.3 281 -15 165 18.2 282 -15 175 24.4 283 -15 185 19.4 284 -15 195 17.7 285 -15 205 14.4 286 -15 215 11.2 287 -15 225 14.5 288 -15 235 11.0 289 -15 245 16.3 290 -15 255 25.3 291 -15 265 48.1 292 -15 275 49.7 293 -15 285 39.7 297 -15 325 14.3 298 -15 335 15.9 299 -15 345 19.6 300 -15 355 50.7 301 -25 5 57.8 302 -25 15 32.4 304 -25 35 14.8 305 -25 45 21.0 306 -25 55 24.6 307 -25 65 27.5 308 -25 75 25.5 309 -25 85 34.9 310 -25 95 38.5 311 -25 105 29.2 312 -25 115 17.8 316 -25 155 17.9 317 -25 165 24.5 318 -25 175 29.4 319 -25 185 29.2 320 -25 195 27.5 321 -25 205 25.8 322 -25 215 26.6 323 -25 225 20.9 324 -25 235 18.9 325 -25 245 23.5 326 -25 255 28.3 327 -25 265 36.1 328 -25 275 51.8 329 -25 285 57.2 332 -25 315 24.2 333 -25 325 21.4 334 -25 335 24.0 335 -25 345 22.9 336 -25 355 41.2 337 -35 5 50.9 338 -35 15 30.4 339 -35 25 22.9 340 -35 35 23.2 341 -35 45 32.3 342 -35 55 30.4 343 -35 65 33.2 344 -35 75 37.8 345 -35 85 48.6 346 -35 95 51.2 347 -35 105 43.2 348 -35 115 33.3 349 -35 125 39.8 350 -35 135 39.3 351 -35 145 31.8 352 -35 155 26.7 353 -35 165 33.6 354 -35 175 30.5 355 -35 185 34.3 356 -35 195 31.6 357 -35 205 34.4 358 -35 215 35.9 359 -35 225 37.9 360 -35 235 31.5 363 -35 265 45.0 364 -35 275 44.0 365 -35 285 31.0 367 -35 305 24.6 368 -35 315 24.9 369 -35 325 30.1 370 -35 335 33.1 371 -35 345 31.4 372 -35 355 39.1 373 -45 5 47.5 377 -45 45 42.6 380 -45 75 34.5 381 -45 85 53.5 382 -45 95 40.4 386 -45 135 47.4 387 -45 145 38.0 388 -45 155 35.8 389 -45 165 38.7 390 -45 175 37.5 391 -45 185 42.7 392 -45 195 41.1 393 -45 205 31.3 394 -45 215 47.6 399 -45 265 33.0 400 -45 275 47.4 401 -45 285 49.7 402 -45 295 32.9 403 -45 305 35.5 404 -45 315 38.0 405 -45 325 37.6 409 -55 10 41.1 417 -55 170 64.5 422 -55 270 37.4 423 -55 290 39.7 424 -55 310 38.1 425 -55 330 40.4 427 -65 10 37.2 429 -65 50 35.5 430 -65 70 42.5 431 -65 90 45.6 433 -65 130 19.5 442 -65 310 45.1