Total Cloud Cover Average Cloud Amount (%) September, October, November (1954 - 1997) , Ship Observations Only Global Average: 68.4 Zonal Averages 17 zones Lat.N Average 85 81.4 75 83.1 65 81.1 55 78.5 45 74.5 35 64.2 25 55.5 15 58.8 5 65.6 -5 58.7 -15 61.3 -25 64.4 -35 70.4 -45 78.1 -55 84.7 -65 84.8 -75 73.7 Grid Box Averages 395 filled boxes Box # Lat.N Lon.E Average 1 85 60 83.2 2 85 180 81.9 3 85 300 78.3 4 75 20 85.5 5 75 60 87.0 6 75 100 84.6 7 75 140 83.4 8 75 180 82.1 9 75 220 80.2 10 75 260 79.7 11 75 300 75.4 12 75 340 85.3 13 65 10 79.4 14 65 30 80.9 15 65 50 82.1 16 65 70 85.5 20 65 150 72.2 21 65 170 75.6 22 65 190 85.5 23 65 210 74.9 24 65 230 79.2 25 65 250 82.9 26 65 270 81.3 27 65 290 81.7 28 65 310 75.4 29 65 330 81.8 30 65 350 82.1 31 55 10 72.2 32 55 30 72.6 37 55 130 60.9 38 55 150 71.1 39 55 170 76.5 40 55 190 83.5 41 55 210 80.5 42 55 230 79.2 44 55 270 82.0 45 55 290 77.3 46 55 310 80.0 47 55 330 82.0 48 55 350 76.3 49 45 5 50.3 50 45 15 47.2 51 45 25 49.7 52 45 35 52.0 53 45 45 55.2 54 45 55 47.5 61 45 125 51.9 62 45 135 49.5 63 45 145 66.2 64 45 155 77.3 65 45 165 81.4 66 45 175 82.5 67 45 185 82.2 68 45 195 82.0 69 45 205 80.8 70 45 215 80.6 71 45 225 78.4 72 45 235 67.6 77 45 285 59.2 78 45 295 64.3 79 45 305 73.2 80 45 315 77.5 81 45 325 76.5 82 45 335 76.3 83 45 345 73.5 84 45 355 67.3 85 35 5 49.0 86 35 15 45.1 87 35 25 35.9 88 35 35 31.9 89 35 45 58.1 90 35 55 48.0 96 35 115 42.1 97 35 125 57.5 98 35 135 63.4 99 35 145 70.1 100 35 155 72.9 101 35 165 71.6 102 35 175 71.7 103 35 185 72.9 104 35 195 72.4 105 35 205 71.5 106 35 215 70.3 107 35 225 70.5 108 35 235 62.2 109 35 245 53.6 112 35 275 54.0 113 35 285 59.9 114 35 295 65.6 115 35 305 63.7 116 35 315 62.1 117 35 325 62.3 118 35 335 63.9 119 35 345 58.7 120 35 355 44.2 124 25 35 17.2 125 25 45 17.8 126 25 55 14.1 127 25 65 24.8 128 25 75 31.3 129 25 85 54.6 130 25 95 55.6 131 25 105 65.3 132 25 115 65.5 133 25 125 65.5 134 25 135 60.4 135 25 145 56.3 136 25 155 55.2 137 25 165 55.0 138 25 175 56.4 139 25 185 57.2 140 25 195 56.6 141 25 205 56.5 142 25 215 61.4 143 25 225 69.7 144 25 235 72.0 145 25 245 46.1 146 25 255 45.2 147 25 265 55.2 148 25 275 56.1 149 25 285 56.5 150 25 295 55.0 151 25 305 54.2 152 25 315 54.2 153 25 325 53.6 154 25 335 52.2 155 25 345 39.6 156 25 355 50.5 160 15 35 25.2 161 15 45 24.1 162 15 55 34.2 163 15 65 43.1 164 15 75 54.1 165 15 85 61.8 166 15 95 64.2 167 15 105 68.6 168 15 115 65.9 169 15 125 65.0 170 15 135 63.1 171 15 145 61.2 172 15 155 60.9 173 15 165 59.3 174 15 175 58.4 175 15 185 59.5 176 15 195 60.0 177 15 205 59.4 178 15 215 63.9 179 15 225 68.9 180 15 235 70.5 181 15 245 62.6 182 15 255 56.4 183 15 265 58.1 184 15 275 62.8 185 15 285 57.0 186 15 295 52.0 187 15 305 55.1 188 15 315 57.7 189 15 325 60.7 190 15 335 57.4 191 15 345 45.7 193 5 5 71.6 197 5 45 40.4 198 5 55 43.4 199 5 65 53.6 200 5 75 63.3 201 5 85 69.2 202 5 95 77.6 203 5 105 72.8 204 5 115 72.0 205 5 125 65.4 206 5 135 66.8 207 5 145 66.8 208 5 155 65.8 209 5 165 65.4 210 5 175 64.8 211 5 185 62.1 212 5 195 62.1 213 5 205 61.8 214 5 215 65.9 215 5 225 64.1 216 5 235 68.2 217 5 245 70.7 218 5 255 74.5 219 5 265 77.2 220 5 275 80.1 221 5 285 78.4 222 5 295 60.6 223 5 305 54.7 224 5 315 54.7 225 5 325 58.8 226 5 335 67.8 227 5 345 68.1 228 5 355 69.7 229 -5 5 78.5 230 -5 15 71.6 232 -5 35 43.1 233 -5 45 44.3 234 -5 55 54.6 235 -5 65 62.6 236 -5 75 68.1 237 -5 85 71.6 238 -5 95 74.3 239 -5 105 70.7 240 -5 115 52.8 241 -5 125 46.7 242 -5 135 53.1 243 -5 145 65.3 244 -5 155 66.0 245 -5 165 64.9 246 -5 175 60.2 247 -5 185 55.9 248 -5 195 49.9 249 -5 205 44.3 250 -5 215 41.7 251 -5 225 39.6 252 -5 235 39.7 253 -5 245 46.7 254 -5 255 61.0 255 -5 265 73.8 256 -5 275 82.0 257 -5 285 82.3 260 -5 315 43.5 261 -5 325 44.6 262 -5 335 49.3 263 -5 345 63.0 264 -5 355 74.1 265 -15 5 88.2 266 -15 15 69.0 268 -15 35 39.7 269 -15 45 36.9 270 -15 55 53.4 271 -15 65 58.6 272 -15 75 64.3 273 -15 85 66.3 274 -15 95 64.0 275 -15 105 55.4 276 -15 115 28.6 277 -15 125 29.3 278 -15 135 40.0 279 -15 145 47.3 280 -15 155 54.1 281 -15 165 62.2 282 -15 175 66.1 283 -15 185 64.8 284 -15 195 63.1 285 -15 205 60.1 286 -15 215 56.5 287 -15 225 49.7 288 -15 235 49.5 289 -15 245 55.9 290 -15 255 66.8 291 -15 265 76.3 292 -15 275 88.6 293 -15 285 84.0 297 -15 325 56.0 298 -15 335 58.5 299 -15 345 73.0 300 -15 355 88.1 301 -25 5 75.4 302 -25 15 57.2 304 -25 35 54.2 305 -25 45 52.9 306 -25 55 53.6 307 -25 65 58.7 308 -25 75 61.9 309 -25 85 64.7 310 -25 95 66.0 311 -25 105 64.8 312 -25 115 37.5 315 -25 145 37.2 316 -25 155 45.8 317 -25 165 55.5 318 -25 175 62.6 319 -25 185 65.4 320 -25 195 68.4 321 -25 205 70.1 322 -25 215 70.0 323 -25 225 67.0 324 -25 235 62.3 325 -25 245 59.8 326 -25 255 65.0 327 -25 265 71.3 328 -25 275 77.0 329 -25 285 77.1 332 -25 315 67.3 333 -25 325 66.4 334 -25 335 65.8 335 -25 345 66.9 336 -25 355 73.8 337 -35 5 74.6 338 -35 15 55.0 339 -35 25 59.7 340 -35 35 67.0 341 -35 45 67.7 342 -35 55 67.3 343 -35 65 70.7 344 -35 75 73.4 345 -35 85 73.7 346 -35 95 73.5 347 -35 105 74.0 348 -35 115 62.5 349 -35 125 66.3 350 -35 135 67.5 351 -35 145 62.8 352 -35 155 60.5 353 -35 165 68.3 354 -35 175 64.5 355 -35 185 67.4 356 -35 195 71.3 357 -35 205 73.7 358 -35 215 75.5 359 -35 225 74.1 360 -35 235 75.2 361 -35 245 75.2 362 -35 255 75.9 363 -35 265 78.3 364 -35 275 78.5 365 -35 285 68.7 366 -35 295 54.0 367 -35 305 57.8 368 -35 315 66.0 369 -35 325 70.9 370 -35 335 72.5 371 -35 345 74.7 372 -35 355 75.0 373 -45 5 78.5 374 -45 15 76.5 375 -45 25 78.2 376 -45 35 80.3 377 -45 45 77.6 378 -45 55 83.0 379 -45 65 83.1 380 -45 75 79.6 381 -45 85 83.4 382 -45 95 82.9 383 -45 105 77.8 384 -45 115 76.9 385 -45 125 73.4 386 -45 135 76.2 387 -45 145 66.2 388 -45 155 73.9 389 -45 165 77.6 390 -45 175 66.2 391 -45 185 75.9 392 -45 195 79.0 393 -45 205 81.4 394 -45 215 80.3 395 -45 225 84.1 396 -45 235 81.3 397 -45 245 83.2 398 -45 255 85.3 399 -45 265 81.1 400 -45 275 81.1 401 -45 285 77.2 402 -45 295 57.5 403 -45 305 60.4 404 -45 315 73.7 405 -45 325 78.6 406 -45 335 81.7 407 -45 345 83.4 408 -45 355 82.6 409 -55 10 86.2 410 -55 30 88.3 411 -55 50 88.0 412 -55 70 85.8 413 -55 90 89.3 414 -55 110 84.7 415 -55 130 85.6 416 -55 150 86.7 417 -55 170 85.5 418 -55 190 77.1 419 -55 210 83.2 420 -55 230 88.9 421 -55 250 87.7 422 -55 270 83.8 423 -55 290 74.9 424 -55 310 79.7 425 -55 330 80.6 426 -55 350 86.5 427 -65 10 82.6 429 -65 50 78.9 430 -65 70 80.6 431 -65 90 85.2 432 -65 110 84.1 433 -65 130 84.5 434 -65 150 89.0 435 -65 170 90.3 436 -65 190 88.1 440 -65 270 91.1 441 -65 290 83.5 442 -65 310 88.5 443 -65 330 79.3 444 -65 350 79.7 449 -75 180 74.4 453 -75 340 72.6