Total Cloud Cover Average Cloud Amount (%) October (1954 - 1997) , Ship Observations Only Global Average: 68.0 Zonal Averages 17 zones Lat.N Average 85 76.7 75 81.9 65 81.9 55 78.5 45 73.9 35 64.3 25 54.7 15 58.0 5 65.4 -5 58.5 -15 60.9 -25 64.9 -35 71.1 -45 78.0 -55 83.3 -65 83.4 -75 70.5 Grid Box Averages 387 filled boxes Box # Lat.N Lon.E Average 1 85 60 77.0 2 85 180 79.8 3 85 300 71.8 4 75 20 85.4 5 75 60 86.1 6 75 100 85.3 7 75 140 82.5 8 75 180 79.1 9 75 220 76.2 10 75 260 74.8 11 75 300 78.6 12 75 340 88.4 13 65 10 80.4 14 65 30 81.5 15 65 50 82.6 16 65 70 82.6 20 65 150 65.6 21 65 170 76.7 22 65 190 86.8 23 65 210 73.5 25 65 250 87.2 26 65 270 84.9 27 65 290 83.7 28 65 310 73.9 29 65 330 82.0 30 65 350 82.3 31 55 10 72.2 32 55 30 71.9 37 55 130 58.8 38 55 150 72.1 39 55 170 76.4 40 55 190 82.0 41 55 210 79.0 42 55 230 79.6 44 55 270 88.0 45 55 290 78.7 46 55 310 80.0 47 55 330 81.9 48 55 350 76.5 49 45 5 52.3 50 45 15 46.3 51 45 25 49.0 52 45 35 50.7 53 45 45 54.3 54 45 55 49.7 62 45 135 46.7 63 45 145 62.1 64 45 155 74.0 65 45 165 80.0 66 45 175 81.6 67 45 185 81.1 68 45 195 81.2 69 45 205 80.8 70 45 215 80.8 71 45 225 78.1 72 45 235 67.4 77 45 285 54.2 78 45 295 61.5 79 45 305 73.4 80 45 315 78.1 81 45 325 77.8 82 45 335 77.1 83 45 345 73.8 84 45 355 68.4 85 35 5 51.0 86 35 15 47.9 87 35 25 36.8 88 35 35 29.7 89 35 45 62.2 90 35 55 49.1 96 35 115 46.2 97 35 125 55.7 98 35 135 63.0 99 35 145 71.1 100 35 155 72.9 101 35 165 72.0 102 35 175 72.1 103 35 185 72.8 104 35 195 71.9 105 35 205 71.2 106 35 215 69.2 107 35 225 69.2 108 35 235 61.7 109 35 245 55.7 112 35 275 52.3 113 35 285 59.4 114 35 295 66.2 115 35 305 65.0 116 35 315 62.6 117 35 325 62.8 118 35 335 64.8 119 35 345 58.1 120 35 355 44.1 124 25 35 14.2 125 25 45 13.9 126 25 55 8.6 127 25 65 14.1 128 25 75 26.6 129 25 85 52.0 130 25 95 59.0 131 25 105 66.9 132 25 115 64.1 133 25 125 64.4 134 25 135 60.1 135 25 145 54.1 136 25 155 54.3 137 25 165 54.7 138 25 175 56.3 139 25 185 56.8 140 25 195 57.1 141 25 205 56.1 142 25 215 60.2 143 25 225 69.2 144 25 235 72.6 145 25 245 45.3 146 25 255 42.5 147 25 265 52.7 148 25 275 54.6 149 25 285 57.1 150 25 295 56.2 151 25 305 54.4 152 25 315 54.2 153 25 325 53.3 154 25 335 50.6 155 25 345 38.4 160 15 35 17.7 161 15 45 20.1 162 15 55 29.4 163 15 65 37.0 164 15 75 53.7 165 15 85 59.7 166 15 95 61.7 167 15 105 68.4 168 15 115 64.4 169 15 125 63.5 170 15 135 62.2 171 15 145 60.7 172 15 155 61.2 173 15 165 61.8 174 15 175 58.2 175 15 185 58.3 176 15 195 60.9 177 15 205 59.3 178 15 215 62.7 179 15 225 66.3 180 15 235 68.2 181 15 245 62.1 182 15 255 55.7 183 15 265 59.8 184 15 275 64.2 185 15 285 57.5 186 15 295 52.9 187 15 305 55.9 188 15 315 58.7 189 15 325 59.4 190 15 335 57.3 191 15 345 42.9 193 5 5 71.8 197 5 45 38.8 198 5 55 41.2 199 5 65 52.3 200 5 75 63.7 201 5 85 69.5 202 5 95 78.1 203 5 105 72.5 204 5 115 71.5 205 5 125 65.8 206 5 135 67.7 207 5 145 68.6 208 5 155 65.5 209 5 165 65.2 210 5 175 63.0 211 5 185 60.3 212 5 195 60.0 213 5 205 60.0 214 5 215 64.8 215 5 225 61.8 216 5 235 68.2 217 5 245 71.1 218 5 255 75.5 219 5 265 79.3 220 5 275 82.2 221 5 285 78.8 222 5 295 58.0 223 5 305 54.2 224 5 315 54.0 225 5 325 58.6 226 5 335 67.5 227 5 345 67.7 228 5 355 70.1 229 -5 5 79.2 230 -5 15 72.7 232 -5 35 46.5 233 -5 45 43.3 234 -5 55 54.2 235 -5 65 64.3 236 -5 75 70.8 237 -5 85 72.5 238 -5 95 74.6 239 -5 105 71.4 240 -5 115 50.8 241 -5 125 42.9 242 -5 135 51.8 243 -5 145 66.9 244 -5 155 65.5 245 -5 165 63.9 246 -5 175 60.1 247 -5 185 55.0 248 -5 195 48.6 249 -5 205 42.8 250 -5 215 40.7 251 -5 225 37.4 252 -5 235 38.7 253 -5 245 46.2 254 -5 255 59.3 255 -5 265 74.3 256 -5 275 84.8 257 -5 285 86.5 260 -5 315 44.2 261 -5 325 43.4 262 -5 335 48.8 263 -5 345 64.2 264 -5 355 76.0 265 -15 5 89.0 266 -15 15 70.5 268 -15 35 37.8 269 -15 45 36.1 270 -15 55 54.3 271 -15 65 58.4 272 -15 75 65.2 273 -15 85 66.9 274 -15 95 63.1 275 -15 105 52.4 276 -15 115 25.5 277 -15 125 27.7 278 -15 135 38.8 279 -15 145 47.1 280 -15 155 54.9 281 -15 165 62.1 282 -15 175 65.7 283 -15 185 65.7 284 -15 195 62.4 285 -15 205 61.3 286 -15 215 57.3 287 -15 225 49.5 288 -15 235 48.4 289 -15 245 55.1 290 -15 255 65.9 291 -15 265 77.3 292 -15 275 87.9 293 -15 285 84.0 297 -15 325 54.5 298 -15 335 56.9 299 -15 345 72.5 300 -15 355 89.1 301 -25 5 76.7 302 -25 15 59.2 304 -25 35 55.6 305 -25 45 55.3 306 -25 55 54.3 307 -25 65 59.3 308 -25 75 64.0 309 -25 85 65.8 310 -25 95 67.9 311 -25 105 65.9 312 -25 115 36.8 315 -25 145 36.9 316 -25 155 46.8 317 -25 165 55.8 318 -25 175 62.3 319 -25 185 65.6 320 -25 195 69.0 321 -25 205 69.9 322 -25 215 70.6 323 -25 225 69.7 324 -25 235 62.8 325 -25 245 57.7 326 -25 255 66.3 327 -25 265 70.0 328 -25 275 73.6 329 -25 285 77.0 332 -25 315 69.1 333 -25 325 66.4 334 -25 335 66.3 335 -25 345 68.0 336 -25 355 73.4 337 -35 5 75.1 338 -35 15 58.2 339 -35 25 62.3 340 -35 35 69.6 341 -35 45 69.6 342 -35 55 68.1 343 -35 65 71.8 344 -35 75 75.0 345 -35 85 76.0 346 -35 95 73.7 347 -35 105 75.7 348 -35 115 62.5 349 -35 125 65.8 350 -35 135 67.0 351 -35 145 61.7 352 -35 155 60.5 353 -35 165 68.4 354 -35 175 65.4 355 -35 185 68.2 356 -35 195 72.1 357 -35 205 74.2 358 -35 215 76.8 359 -35 225 75.6 360 -35 235 75.5 361 -35 245 75.4 362 -35 255 76.5 363 -35 265 78.7 364 -35 275 74.8 365 -35 285 70.1 366 -35 295 57.7 367 -35 305 58.8 368 -35 315 65.1 369 -35 325 70.6 370 -35 335 72.0 371 -35 345 75.7 372 -35 355 75.5 373 -45 5 79.8 374 -45 15 72.5 375 -45 25 74.4 376 -45 35 76.3 377 -45 45 75.9 378 -45 55 83.0 379 -45 65 82.0 380 -45 75 77.4 381 -45 85 81.7 382 -45 95 83.9 383 -45 105 78.9 384 -45 115 75.6 385 -45 125 73.5 386 -45 135 76.4 387 -45 145 65.3 388 -45 155 71.8 389 -45 165 77.9 390 -45 175 64.8 391 -45 185 75.4 392 -45 195 81.2 393 -45 205 80.4 394 -45 215 80.1 395 -45 225 84.8 396 -45 235 83.2 397 -45 245 80.9 398 -45 255 86.2 399 -45 265 80.2 400 -45 275 82.6 401 -45 285 77.2 402 -45 295 61.5 403 -45 305 64.6 404 -45 315 75.2 405 -45 325 80.5 406 -45 335 80.4 407 -45 345 86.7 408 -45 355 84.2 409 -55 10 85.3 410 -55 30 85.4 411 -55 50 84.7 412 -55 70 82.2 413 -55 90 86.0 414 -55 110 82.7 415 -55 130 83.4 416 -55 150 83.5 417 -55 170 86.4 418 -55 190 78.3 419 -55 210 81.7 420 -55 230 84.5 421 -55 250 88.8 422 -55 270 83.8 423 -55 290 76.3 424 -55 310 80.9 425 -55 330 79.3 426 -55 350 84.9 429 -65 50 77.8 430 -65 70 84.7 431 -65 90 80.0 432 -65 110 82.8 433 -65 130 81.3 434 -65 150 86.3 435 -65 170 91.2 441 -65 290 82.6 442 -65 310 86.3 444 -65 350 77.9 453 -75 340 70.5