Stratocumulus Frequency of Occurrence (%) September (1954 - 1997) Night, Ship Observations Only Global Average: 31.6 Zonal Averages 15 zones Lat.N Average 85 36.8 75 41.7 65 41.1 55 39.6 45 36.2 35 28.2 25 20.7 15 21.6 5 23.7 -5 24.5 -15 31.7 -25 37.1 -35 37.5 -45 37.2 -55 44.9 Grid Box Averages 324 filled boxes Box # Lat.N Lon.E Average 1 85 60 35.1 2 85 180 37.5 3 85 300 38.0 4 75 20 41.9 5 75 60 47.6 6 75 100 41.6 7 75 140 40.7 8 75 180 37.1 9 75 220 35.7 10 75 260 55.4 11 75 300 43.2 12 75 340 42.9 13 65 10 35.4 14 65 30 46.4 15 65 50 41.4 16 65 70 42.7 21 65 170 51.6 22 65 190 51.2 23 65 210 29.4 25 65 250 48.4 26 65 270 51.7 27 65 290 43.6 28 65 310 35.4 29 65 330 33.1 30 65 350 39.2 31 55 10 31.3 32 55 30 32.4 38 55 150 35.4 39 55 170 43.5 40 55 190 43.1 41 55 210 41.1 42 55 230 33.2 44 55 270 44.2 45 55 290 37.0 46 55 310 38.1 47 55 330 40.0 48 55 350 40.5 49 45 5 15.4 50 45 15 16.3 51 45 25 14.9 52 45 35 18.7 53 45 45 18.1 54 45 55 14.4 62 45 135 21.9 63 45 145 30.4 64 45 155 38.6 65 45 165 42.9 66 45 175 43.5 67 45 185 43.0 68 45 195 40.7 69 45 205 38.4 70 45 215 42.6 71 45 225 46.3 72 45 235 33.2 77 45 285 21.9 78 45 295 22.6 79 45 305 27.2 80 45 315 34.0 81 45 325 36.2 82 45 335 36.7 83 45 345 41.2 84 45 355 31.0 85 35 5 17.1 86 35 15 11.3 87 35 25 5.6 88 35 35 8.3 97 35 125 22.7 98 35 135 23.1 99 35 145 32.6 100 35 155 33.1 101 35 165 34.3 102 35 175 35.1 103 35 185 34.2 104 35 195 32.2 105 35 205 32.5 106 35 215 39.3 107 35 225 51.1 108 35 235 39.2 109 35 245 41.2 112 35 275 17.8 113 35 285 19.9 114 35 295 20.6 115 35 305 18.4 116 35 315 18.6 117 35 325 20.5 118 35 335 26.1 119 35 345 30.9 120 35 355 18.6 124 25 35 3.7 125 25 45 4.1 126 25 55 5.1 127 25 65 19.7 129 25 85 15.5 132 25 115 22.0 133 25 125 22.7 134 25 135 18.0 135 25 145 15.7 136 25 155 16.7 137 25 165 15.8 138 25 175 18.9 139 25 185 15.4 140 25 195 13.5 141 25 205 19.8 142 25 215 31.9 143 25 225 46.5 144 25 235 52.1 145 25 245 26.5 146 25 255 18.9 147 25 265 15.5 148 25 275 15.2 149 25 285 16.1 150 25 295 13.1 151 25 305 12.2 152 25 315 12.3 153 25 325 19.0 154 25 335 25.7 155 25 345 17.5 160 15 35 8.8 161 15 45 10.7 162 15 55 18.1 163 15 65 20.1 164 15 75 21.9 165 15 85 22.1 166 15 95 22.0 167 15 105 20.3 168 15 115 22.1 169 15 125 23.9 170 15 135 20.6 171 15 145 20.4 172 15 155 20.4 173 15 165 14.1 174 15 175 15.0 175 15 185 14.9 176 15 195 19.5 177 15 205 24.2 178 15 215 29.2 179 15 225 38.7 180 15 235 38.5 181 15 245 25.4 182 15 255 22.5 183 15 265 26.1 184 15 275 19.6 185 15 285 16.6 186 15 295 12.4 187 15 305 12.7 188 15 315 17.0 189 15 325 26.0 190 15 335 25.1 191 15 345 16.9 193 5 5 34.1 197 5 45 11.0 198 5 55 9.7 199 5 65 15.0 200 5 75 18.3 201 5 85 21.0 202 5 95 24.4 203 5 105 22.9 204 5 115 23.5 205 5 125 19.7 206 5 135 19.2 207 5 145 21.7 208 5 155 19.9 209 5 165 15.5 210 5 175 17.6 211 5 185 13.1 212 5 195 21.8 213 5 205 23.8 214 5 215 27.4 215 5 225 25.4 216 5 235 28.5 217 5 245 37.4 218 5 255 42.1 219 5 265 38.0 220 5 275 33.3 221 5 285 33.2 223 5 305 13.4 224 5 315 18.9 225 5 325 18.1 226 5 335 21.6 227 5 345 33.1 228 5 355 41.1 229 -5 5 54.8 230 -5 15 46.4 233 -5 45 14.5 234 -5 55 17.2 235 -5 65 21.7 236 -5 75 19.9 237 -5 85 23.7 238 -5 95 20.9 239 -5 105 21.5 240 -5 115 11.1 241 -5 125 11.9 242 -5 135 14.4 243 -5 145 20.8 244 -5 155 23.5 245 -5 165 17.4 246 -5 175 14.7 247 -5 185 10.8 248 -5 195 14.2 249 -5 205 12.2 250 -5 215 13.0 251 -5 225 11.9 252 -5 235 13.5 253 -5 245 27.0 254 -5 255 46.5 255 -5 265 58.0 256 -5 275 54.2 257 -5 285 53.9 260 -5 315 10.6 261 -5 325 13.6 262 -5 335 19.8 263 -5 345 34.8 264 -5 355 53.8 265 -15 5 72.4 266 -15 15 43.5 268 -15 35 13.3 269 -15 45 9.4 270 -15 55 21.7 271 -15 65 28.8 272 -15 75 32.2 273 -15 85 28.8 274 -15 95 28.5 275 -15 105 27.6 276 -15 115 8.1 277 -15 125 4.7 278 -15 135 7.3 279 -15 145 18.2 280 -15 155 21.6 281 -15 165 22.8 282 -15 175 28.3 283 -15 185 25.5 284 -15 195 22.0 285 -15 205 18.6 286 -15 215 19.5 287 -15 225 13.2 288 -15 235 16.5 289 -15 245 27.4 290 -15 255 43.2 291 -15 265 62.2 292 -15 275 72.5 293 -15 285 68.1 297 -15 325 18.1 298 -15 335 36.6 299 -15 345 48.1 300 -15 355 69.8 301 -25 5 63.1 302 -25 15 33.0 304 -25 35 21.9 305 -25 45 23.0 306 -25 55 24.4 307 -25 65 39.8 308 -25 75 43.3 309 -25 85 48.4 310 -25 95 43.7 311 -25 105 38.9 312 -25 115 16.2 315 -25 145 6.6 316 -25 155 15.7 317 -25 165 27.6 318 -25 175 33.8 319 -25 185 31.3 320 -25 195 31.3 321 -25 205 35.9 322 -25 215 31.9 323 -25 225 34.6 324 -25 235 32.1 325 -25 245 31.6 327 -25 265 49.1 328 -25 275 61.7 329 -25 285 55.5 332 -25 315 26.8 333 -25 325 27.1 334 -25 335 34.4 335 -25 345 36.8 336 -25 355 53.3 337 -35 5 50.4 338 -35 15 30.1 339 -35 25 25.8 340 -35 35 33.0 341 -35 45 36.1 342 -35 55 38.6 343 -35 65 38.4 344 -35 75 42.5 345 -35 85 50.4 346 -35 95 47.7 347 -35 105 47.6 348 -35 115 35.8 349 -35 125 34.0 350 -35 135 36.2 351 -35 145 30.8 352 -35 155 25.2 353 -35 165 30.4 354 -35 175 34.0 355 -35 185 35.2 356 -35 195 35.9 357 -35 205 39.9 358 -35 215 31.7 359 -35 225 26.2 360 -35 235 40.6 363 -35 265 44.7 364 -35 275 52.8 365 -35 285 39.3 367 -35 305 24.5 368 -35 315 29.5 369 -35 325 43.8 370 -35 335 33.0 371 -35 345 29.5 372 -35 355 43.8 387 -45 145 32.4 388 -45 155 31.0 389 -45 165 37.8 390 -45 175 39.4 391 -45 185 44.0 392 -45 195 34.1 400 -45 275 58.6 401 -45 285 35.5 402 -45 295 28.9 403 -45 305 33.3 404 -45 315 29.3 417 -55 170 61.5 422 -55 270 36.7 423 -55 290 39.2 424 -55 310 45.5 425 -55 330 40.7