Total Cloud Cover Average Cloud Amount (%) September, October, November (1954 - 1997) Day, Ship Observations Only Global Average: 67.8 Zonal Averages 17 zones Lat.N Average 85 81.0 75 82.6 65 81.5 55 78.7 45 74.6 35 64.5 25 55.8 15 59.0 5 65.4 -5 57.9 -15 60.0 -25 62.3 -35 69.2 -45 77.7 -55 83.9 -65 83.5 -75 74.1 Grid Box Averages 394 filled boxes Box # Lat.N Lon.E Average 1 85 60 83.0 2 85 180 81.6 3 85 300 77.3 4 75 20 85.4 5 75 60 87.5 6 75 100 84.0 7 75 140 82.3 8 75 180 81.1 9 75 220 78.6 10 75 260 78.5 11 75 300 76.8 12 75 340 85.1 13 65 10 79.5 14 65 30 81.7 15 65 50 82.5 16 65 70 84.9 20 65 150 69.8 21 65 170 75.0 22 65 190 85.4 23 65 210 75.4 24 65 230 78.8 25 65 250 83.2 26 65 270 81.3 27 65 290 82.9 28 65 310 76.2 29 65 330 82.3 30 65 350 82.4 31 55 10 72.5 32 55 30 75.2 37 55 130 62.3 38 55 150 72.1 39 55 170 76.3 40 55 190 82.8 41 55 210 80.9 42 55 230 80.4 44 55 270 82.3 45 55 290 77.7 46 55 310 80.2 47 55 330 82.0 48 55 350 76.9 49 45 5 50.8 50 45 15 50.5 51 45 25 51.9 52 45 35 53.7 53 45 45 56.0 54 45 55 52.1 61 45 125 51.0 62 45 135 53.1 63 45 145 67.7 64 45 155 76.9 65 45 165 80.6 66 45 175 81.6 67 45 185 81.5 68 45 195 81.6 69 45 205 80.9 70 45 215 80.5 71 45 225 78.4 72 45 235 68.8 77 45 285 60.8 78 45 295 65.2 79 45 305 73.7 80 45 315 77.4 81 45 325 76.3 82 45 335 75.8 83 45 345 73.7 84 45 355 67.7 85 35 5 48.4 86 35 15 47.8 87 35 25 38.0 88 35 35 34.4 89 35 45 56.7 90 35 55 49.4 96 35 115 47.4 97 35 125 58.0 98 35 135 64.5 99 35 145 70.5 100 35 155 72.7 101 35 165 71.6 102 35 175 71.4 103 35 185 71.6 104 35 195 72.5 105 35 205 71.2 106 35 215 69.8 107 35 225 69.9 108 35 235 62.5 109 35 245 53.4 112 35 275 54.7 113 35 285 61.6 114 35 295 66.7 115 35 305 64.9 116 35 315 62.9 117 35 325 62.8 118 35 335 64.0 119 35 345 58.8 120 35 355 45.5 124 25 35 18.2 125 25 45 19.3 126 25 55 15.2 127 25 65 25.9 128 25 75 36.2 129 25 85 54.3 130 25 95 59.0 131 25 105 67.2 132 25 115 67.3 133 25 125 65.8 134 25 135 60.2 135 25 145 56.5 136 25 155 55.6 137 25 165 55.3 138 25 175 56.6 139 25 185 56.8 140 25 195 56.6 141 25 205 56.5 142 25 215 60.8 143 25 225 68.0 144 25 235 69.8 145 25 245 46.8 146 25 255 46.6 147 25 265 56.7 148 25 275 57.4 149 25 285 57.3 150 25 295 55.9 151 25 305 55.0 152 25 315 54.7 153 25 325 54.4 154 25 335 52.7 155 25 345 40.5 156 25 355 50.4 160 15 35 26.4 161 15 45 23.9 162 15 55 35.0 163 15 65 44.7 164 15 75 55.4 165 15 85 62.8 166 15 95 65.2 167 15 105 69.5 168 15 115 66.8 169 15 125 65.8 170 15 135 63.8 171 15 145 61.0 172 15 155 60.7 173 15 165 59.0 174 15 175 59.6 175 15 185 59.5 176 15 195 59.7 177 15 205 59.6 178 15 215 62.6 179 15 225 67.3 180 15 235 67.9 181 15 245 62.2 182 15 255 56.2 183 15 265 57.5 184 15 275 62.8 185 15 285 58.1 186 15 295 53.4 187 15 305 56.3 188 15 315 58.2 189 15 325 61.1 190 15 335 58.6 191 15 345 48.1 193 5 5 70.4 197 5 45 41.2 198 5 55 45.3 199 5 65 54.8 200 5 75 63.8 201 5 85 69.2 202 5 95 76.4 203 5 105 74.0 204 5 115 73.3 205 5 125 65.3 206 5 135 66.8 207 5 145 66.1 208 5 155 65.8 209 5 165 65.9 210 5 175 65.3 211 5 185 61.6 212 5 195 62.0 213 5 205 62.3 214 5 215 66.1 215 5 225 64.2 216 5 235 66.6 217 5 245 68.9 218 5 255 72.2 219 5 265 75.3 220 5 275 79.3 221 5 285 79.9 222 5 295 61.6 223 5 305 56.3 224 5 315 55.1 225 5 325 57.7 226 5 335 66.7 227 5 345 68.0 228 5 355 67.1 229 -5 5 74.5 230 -5 15 78.5 232 -5 35 48.8 233 -5 45 44.6 234 -5 55 53.7 235 -5 65 62.9 236 -5 75 68.6 237 -5 85 72.3 238 -5 95 74.7 239 -5 105 71.9 240 -5 115 55.2 241 -5 125 48.1 242 -5 135 55.4 243 -5 145 65.4 244 -5 155 66.5 245 -5 165 65.0 246 -5 175 61.5 247 -5 185 55.7 248 -5 195 50.9 249 -5 205 45.9 250 -5 215 42.4 251 -5 225 40.1 252 -5 235 39.0 253 -5 245 44.8 254 -5 255 55.2 255 -5 265 66.9 256 -5 275 77.5 257 -5 285 86.0 260 -5 315 46.5 261 -5 325 44.8 262 -5 335 48.1 263 -5 345 59.0 264 -5 355 68.8 265 -15 5 84.3 266 -15 15 71.9 268 -15 35 42.1 269 -15 45 40.2 270 -15 55 51.9 271 -15 65 56.1 272 -15 75 62.5 273 -15 85 64.9 274 -15 95 62.8 275 -15 105 55.7 276 -15 115 30.5 277 -15 125 33.2 278 -15 135 44.4 279 -15 145 46.5 280 -15 155 53.7 281 -15 165 61.3 282 -15 175 65.5 283 -15 185 65.1 284 -15 195 62.1 285 -15 205 60.3 286 -15 215 55.8 287 -15 225 49.9 288 -15 235 48.3 289 -15 245 53.2 290 -15 255 61.5 291 -15 265 70.3 292 -15 275 86.0 293 -15 285 85.4 297 -15 325 55.8 298 -15 335 55.4 299 -15 345 68.3 300 -15 355 84.6 301 -25 5 70.2 302 -25 15 59.3 304 -25 35 53.9 305 -25 45 51.3 306 -25 55 52.0 307 -25 65 56.0 308 -25 75 57.9 309 -25 85 59.7 310 -25 95 61.8 311 -25 105 63.5 312 -25 115 38.1 315 -25 145 37.8 316 -25 155 45.6 317 -25 165 53.2 318 -25 175 60.4 319 -25 185 64.3 320 -25 195 67.2 321 -25 205 68.4 322 -25 215 69.0 323 -25 225 66.9 324 -25 235 61.0 325 -25 245 59.7 326 -25 255 61.3 327 -25 265 68.1 328 -25 275 73.4 329 -25 285 76.7 332 -25 315 66.5 333 -25 325 65.7 334 -25 335 64.1 335 -25 345 62.8 336 -25 355 69.6 337 -35 5 71.6 338 -35 15 55.6 339 -35 25 59.2 340 -35 35 64.7 341 -35 45 66.4 342 -35 55 66.7 343 -35 65 68.6 344 -35 75 70.3 345 -35 85 70.6 346 -35 95 70.7 347 -35 105 72.9 348 -35 115 63.3 349 -35 125 67.0 350 -35 135 67.7 351 -35 145 63.1 352 -35 155 59.4 353 -35 165 65.8 354 -35 175 62.9 355 -35 185 65.7 356 -35 195 70.6 357 -35 205 72.6 358 -35 215 75.6 359 -35 225 74.7 360 -35 235 74.9 361 -35 245 75.3 362 -35 255 75.1 363 -35 265 75.0 364 -35 275 77.0 365 -35 285 69.2 366 -35 295 56.2 367 -35 305 59.0 368 -35 315 66.8 369 -35 325 69.7 370 -35 335 70.7 371 -35 345 72.3 372 -35 355 72.6 373 -45 5 77.9 374 -45 15 77.6 375 -45 25 78.8 376 -45 35 80.1 377 -45 45 79.2 378 -45 55 84.0 379 -45 65 82.2 380 -45 75 77.9 381 -45 85 81.4 382 -45 95 81.8 383 -45 105 78.4 384 -45 115 75.2 385 -45 125 75.3 386 -45 135 77.8 387 -45 145 68.5 388 -45 155 72.1 389 -45 165 76.3 390 -45 175 65.5 391 -45 185 74.5 392 -45 195 79.8 393 -45 205 80.7 394 -45 215 80.2 395 -45 225 83.5 396 -45 235 80.5 397 -45 245 81.7 398 -45 255 83.2 399 -45 265 79.2 400 -45 275 80.3 401 -45 285 78.2 402 -45 295 57.8 403 -45 305 63.0 404 -45 315 74.1 405 -45 325 80.0 406 -45 335 78.6 407 -45 345 80.8 408 -45 355 81.1 409 -55 10 84.2 410 -55 30 86.1 411 -55 50 87.0 412 -55 70 83.9 413 -55 90 87.9 414 -55 110 83.6 415 -55 130 86.5 416 -55 150 85.8 417 -55 170 84.7 418 -55 190 76.4 419 -55 210 84.4 420 -55 230 88.5 421 -55 250 86.3 422 -55 270 83.0 423 -55 290 74.4 424 -55 310 80.4 425 -55 330 80.5 426 -55 350 85.7 427 -65 10 82.9 429 -65 50 75.3 430 -65 70 80.4 431 -65 90 86.3 432 -65 110 83.9 433 -65 130 83.2 434 -65 150 88.0 435 -65 170 90.1 436 -65 190 86.9 441 -65 290 83.2 442 -65 310 87.2 443 -65 330 75.9 444 -65 350 81.1 449 -75 180 74.9 453 -75 340 72.8