Stratocumulus Frequency of Occurrence (%) March (1954 - 1997) Night, Ship Observations Only Global Average: 30.0 Zonal Averages 17 zones Lat.N Average 85 11.9 75 19.5 65 36.7 55 38.5 45 36.1 35 35.3 25 30.9 15 21.1 5 19.8 -5 18.1 -15 22.0 -25 28.2 -35 36.9 -45 41.4 -55 39.0 -65 47.4 -75 50.7 Grid Box Averages 363 filled boxes Box # Lat.N Lon.E Average 1 85 60 9.0 2 85 180 10.3 3 85 300 18.5 4 75 20 36.0 5 75 60 21.0 7 75 140 18.2 8 75 180 7.2 9 75 220 18.0 12 75 340 16.0 13 65 10 32.3 14 65 30 28.4 15 65 50 24.6 21 65 170 48.7 22 65 190 35.3 29 65 330 42.1 30 65 350 37.1 31 55 10 29.1 32 55 30 25.8 38 55 150 35.1 39 55 170 42.9 40 55 190 42.0 41 55 210 39.9 42 55 230 34.7 46 55 310 37.5 47 55 330 36.7 48 55 350 41.8 49 45 5 23.5 50 45 15 23.1 51 45 25 24.9 52 45 35 31.6 53 45 45 24.7 54 45 55 29.5 62 45 135 18.1 63 45 145 31.0 64 45 155 41.2 65 45 165 41.0 66 45 175 38.9 67 45 185 37.0 68 45 195 37.1 69 45 205 38.4 70 45 215 39.4 71 45 225 41.3 72 45 235 36.1 77 45 285 22.0 78 45 295 28.3 79 45 305 32.1 80 45 315 37.0 81 45 325 36.0 82 45 335 36.5 83 45 345 39.9 84 45 355 32.7 85 35 5 24.9 86 35 15 21.7 87 35 25 19.6 88 35 35 17.0 97 35 125 25.2 98 35 135 28.4 99 35 145 34.4 100 35 155 39.7 101 35 165 38.7 102 35 175 40.2 103 35 185 42.3 104 35 195 42.2 105 35 205 40.5 106 35 215 44.7 107 35 225 51.7 108 35 235 36.7 109 35 245 28.1 112 35 275 23.4 113 35 285 27.4 114 35 295 32.2 115 35 305 31.5 116 35 315 30.7 117 35 325 33.9 118 35 335 37.5 119 35 345 35.0 120 35 355 22.0 124 25 35 6.5 125 25 45 20.9 126 25 55 10.6 127 25 65 7.9 129 25 85 12.1 131 25 105 53.8 132 25 115 35.1 133 25 125 37.9 134 25 135 38.5 135 25 145 31.7 136 25 155 32.8 137 25 165 33.7 138 25 175 33.9 139 25 185 34.2 140 25 195 30.5 141 25 205 29.6 142 25 215 40.6 143 25 225 50.4 144 25 235 53.1 145 25 245 27.2 146 25 255 18.8 147 25 265 31.0 148 25 275 24.5 149 25 285 23.3 150 25 295 21.2 151 25 305 20.1 152 25 315 22.8 153 25 325 28.9 154 25 335 29.0 155 25 345 18.5 160 15 35 8.3 161 15 45 9.3 162 15 55 7.8 163 15 65 6.6 164 15 75 7.0 165 15 85 9.3 166 15 95 10.4 167 15 105 28.1 168 15 115 19.2 169 15 125 22.7 170 15 135 21.5 171 15 145 19.9 172 15 155 20.2 173 15 165 18.9 174 15 175 23.5 175 15 185 20.5 176 15 195 20.2 177 15 205 25.3 178 15 215 32.1 179 15 225 45.9 180 15 235 48.0 181 15 245 37.2 182 15 255 13.4 183 15 265 11.9 184 15 275 14.7 185 15 285 15.8 186 15 295 14.1 187 15 305 13.6 188 15 315 20.3 189 15 325 28.5 190 15 335 23.7 191 15 345 7.9 193 5 5 22.1 197 5 45 8.2 198 5 55 9.3 199 5 65 8.0 200 5 75 9.4 201 5 85 13.8 202 5 95 17.0 203 5 105 18.1 204 5 115 18.4 205 5 125 21.3 206 5 135 20.8 207 5 145 25.9 208 5 155 25.2 209 5 165 28.4 210 5 175 13.5 211 5 185 18.3 212 5 195 20.6 213 5 205 21.4 214 5 215 32.8 215 5 225 25.9 216 5 235 26.4 217 5 245 22.2 218 5 255 14.7 219 5 265 18.6 220 5 275 17.5 221 5 285 20.5 223 5 305 20.1 224 5 315 24.4 225 5 325 26.4 226 5 335 22.6 227 5 345 13.1 228 5 355 17.3 229 -5 5 23.9 230 -5 15 26.7 233 -5 45 9.6 234 -5 55 11.4 235 -5 65 10.6 236 -5 75 13.1 237 -5 85 13.6 238 -5 95 21.3 239 -5 105 18.1 240 -5 115 18.6 241 -5 125 17.3 242 -5 135 16.4 243 -5 145 20.9 244 -5 155 23.9 245 -5 165 21.3 246 -5 175 17.1 247 -5 185 12.0 248 -5 195 16.9 249 -5 205 17.3 250 -5 215 14.1 251 -5 225 11.9 252 -5 235 14.8 253 -5 245 26.4 254 -5 255 26.3 255 -5 265 25.3 256 -5 275 27.0 257 -5 285 24.4 260 -5 315 21.1 261 -5 325 18.4 262 -5 335 19.7 263 -5 345 17.0 264 -5 355 19.7 265 -15 5 57.5 266 -15 15 45.6 268 -15 35 14.3 269 -15 45 11.0 270 -15 55 12.6 271 -15 65 14.3 272 -15 75 12.5 273 -15 85 19.3 274 -15 95 23.0 275 -15 105 20.1 276 -15 115 13.3 277 -15 125 17.1 278 -15 135 17.9 279 -15 145 22.4 280 -15 155 18.5 281 -15 165 24.9 282 -15 175 20.3 283 -15 185 18.9 284 -15 195 16.7 285 -15 205 12.7 286 -15 215 14.1 287 -15 225 12.3 288 -15 235 12.1 289 -15 245 15.5 290 -15 255 26.5 291 -15 265 47.6 292 -15 275 44.3 293 -15 285 34.9 297 -15 325 13.8 298 -15 335 15.3 299 -15 345 22.1 300 -15 355 40.1 301 -25 5 59.8 302 -25 15 37.0 304 -25 35 14.8 305 -25 45 17.2 306 -25 55 18.1 307 -25 65 23.4 308 -25 75 24.7 309 -25 85 36.7 310 -25 95 36.6 311 -25 105 39.4 312 -25 115 19.3 315 -25 145 17.0 316 -25 155 18.9 317 -25 165 25.2 318 -25 175 25.8 319 -25 185 26.8 320 -25 195 27.4 321 -25 205 23.1 322 -25 215 20.5 323 -25 225 21.7 324 -25 235 13.9 325 -25 245 17.6 326 -25 255 20.9 327 -25 265 31.8 328 -25 275 54.3 329 -25 285 58.5 332 -25 315 23.5 333 -25 325 18.5 334 -25 335 16.2 335 -25 345 25.7 336 -25 355 39.5 337 -35 5 45.8 338 -35 15 33.6 339 -35 25 27.3 340 -35 35 26.9 341 -35 45 27.6 342 -35 55 39.9 343 -35 65 35.9 344 -35 75 42.3 345 -35 85 45.4 346 -35 95 47.6 347 -35 105 48.7 348 -35 115 31.7 349 -35 125 44.1 350 -35 135 42.6 351 -35 145 33.0 352 -35 155 26.5 353 -35 165 36.7 354 -35 175 33.2 355 -35 185 36.9 356 -35 195 35.7 357 -35 205 32.3 358 -35 215 41.3 359 -35 225 39.1 360 -35 235 28.3 363 -35 265 37.0 364 -35 275 49.6 365 -35 285 49.5 367 -35 305 22.1 368 -35 315 28.4 369 -35 325 30.2 370 -35 335 36.3 371 -35 345 32.8 372 -35 355 38.1 373 -45 5 40.8 374 -45 15 38.4 375 -45 25 33.3 376 -45 35 31.4 377 -45 45 39.7 378 -45 55 45.1 379 -45 65 45.7 380 -45 75 39.2 381 -45 85 52.1 382 -45 95 47.2 383 -45 105 40.3 385 -45 125 50.4 386 -45 135 47.0 387 -45 145 37.8 388 -45 155 40.4 389 -45 165 45.3 390 -45 175 38.8 391 -45 185 41.5 392 -45 195 45.5 393 -45 205 55.9 399 -45 265 41.0 400 -45 275 49.5 401 -45 285 47.5 402 -45 295 24.0 403 -45 305 29.0 404 -45 315 38.2 405 -45 325 28.0 409 -55 10 36.8 410 -55 30 35.1 411 -55 50 36.5 412 -55 70 44.3 413 -55 90 41.5 414 -55 110 40.7 415 -55 130 43.8 416 -55 150 45.0 417 -55 170 51.9 418 -55 190 36.8 419 -55 210 42.2 421 -55 250 21.9 422 -55 270 39.0 423 -55 290 39.0 424 -55 310 41.7 425 -55 330 34.5 426 -55 350 32.8 427 -65 10 41.0 428 -65 30 41.5 429 -65 50 44.1 430 -65 70 51.3 431 -65 90 56.5 432 -65 110 54.8 433 -65 130 52.1 434 -65 150 45.1 435 -65 170 45.7 436 -65 190 33.7 437 -65 210 39.7 438 -65 230 54.8 440 -65 270 52.4 441 -65 290 49.7 442 -65 310 45.5 443 -65 330 52.6 444 -65 350 52.2 449 -75 180 56.8 450 -75 220 49.8 453 -75 340 42.1