Total Cloud Cover Average Cloud Amount (%) October (1954 - 1997) Day, Ship Observations Only Global Average: 67.5 Zonal Averages 17 zones Lat.N Average 85 77.6 75 82.2 65 82.5 55 78.7 45 74.2 35 64.6 25 54.8 15 58.3 5 65.2 -5 57.7 -15 59.7 -25 62.4 -35 69.6 -45 77.9 -55 83.2 -65 82.0 -75 70.6 Grid Box Averages 378 filled boxes Box # Lat.N Lon.E Average 1 85 60 79.2 2 85 180 79.5 3 85 300 72.7 4 75 20 85.8 5 75 60 87.4 6 75 100 84.6 7 75 140 81.7 8 75 180 80.6 9 75 220 75.3 10 75 260 74.0 11 75 300 81.2 12 75 340 88.5 13 65 10 80.6 14 65 30 83.0 15 65 50 83.2 16 65 70 82.0 20 65 150 65.6 21 65 170 76.3 22 65 190 86.2 23 65 210 73.6 25 65 250 87.1 26 65 270 85.5 27 65 290 85.2 28 65 310 74.8 29 65 330 83.2 30 65 350 83.0 31 55 10 72.5 32 55 30 75.7 37 55 130 60.5 38 55 150 71.5 39 55 170 76.2 40 55 190 81.4 41 55 210 79.8 42 55 230 81.2 44 55 270 89.1 45 55 290 79.3 46 55 310 80.3 47 55 330 82.0 48 55 350 77.4 49 45 5 52.9 50 45 15 50.4 51 45 25 52.5 52 45 35 53.5 53 45 45 59.0 54 45 55 55.4 62 45 135 49.6 63 45 145 64.2 64 45 155 74.0 65 45 165 79.7 66 45 175 80.9 67 45 185 80.2 68 45 195 81.2 69 45 205 81.0 70 45 215 80.4 71 45 225 78.2 72 45 235 68.6 77 45 285 56.7 78 45 295 63.4 79 45 305 73.8 80 45 315 77.7 81 45 325 77.3 82 45 335 76.7 83 45 345 74.2 84 45 355 68.8 85 35 5 51.3 86 35 15 49.8 87 35 25 39.2 88 35 35 33.2 90 35 55 50.9 96 35 115 46.6 97 35 125 55.5 98 35 135 63.6 99 35 145 71.6 100 35 155 72.9 101 35 165 71.5 102 35 175 71.5 103 35 185 71.5 104 35 195 72.1 105 35 205 71.3 106 35 215 68.2 107 35 225 68.0 108 35 235 61.6 109 35 245 54.4 112 35 275 52.9 113 35 285 61.3 114 35 295 67.2 115 35 305 66.2 116 35 315 63.4 117 35 325 63.5 118 35 335 64.6 119 35 345 58.9 120 35 355 46.0 124 25 35 15.4 125 25 45 17.3 126 25 55 9.9 127 25 65 15.7 128 25 75 29.1 129 25 85 54.0 130 25 95 59.5 131 25 105 67.4 132 25 115 66.1 133 25 125 64.6 134 25 135 59.8 135 25 145 54.6 136 25 155 55.0 137 25 165 54.2 138 25 175 56.3 139 25 185 56.1 140 25 195 56.9 141 25 205 55.3 142 25 215 59.0 143 25 225 66.9 144 25 235 68.3 145 25 245 45.3 146 25 255 43.2 147 25 265 53.8 148 25 275 55.5 149 25 285 58.3 150 25 295 57.5 151 25 305 55.6 152 25 315 54.7 153 25 325 54.8 154 25 335 51.8 155 25 345 39.0 160 15 35 20.6 161 15 45 20.8 162 15 55 30.7 163 15 65 39.3 164 15 75 55.2 165 15 85 61.0 166 15 95 62.0 167 15 105 69.7 168 15 115 64.9 169 15 125 63.9 170 15 135 62.3 171 15 145 60.6 172 15 155 61.0 173 15 165 60.1 174 15 175 60.1 175 15 185 57.6 176 15 195 60.2 177 15 205 59.2 178 15 215 62.7 179 15 225 65.6 180 15 235 64.8 181 15 245 60.5 182 15 255 55.4 183 15 265 59.3 184 15 275 64.2 185 15 285 59.1 186 15 295 54.0 187 15 305 57.4 188 15 315 60.0 189 15 325 61.3 190 15 335 59.1 191 15 345 45.4 193 5 5 70.8 197 5 45 40.5 198 5 55 43.5 199 5 65 53.6 200 5 75 64.3 201 5 85 69.5 202 5 95 76.9 203 5 105 73.5 204 5 115 72.3 205 5 125 65.3 206 5 135 67.5 207 5 145 67.2 208 5 155 65.5 209 5 165 65.9 210 5 175 64.1 211 5 185 60.6 212 5 195 61.3 213 5 205 61.0 214 5 215 66.3 215 5 225 61.9 216 5 235 66.8 217 5 245 68.9 218 5 255 72.6 219 5 265 77.2 220 5 275 81.1 221 5 285 80.7 223 5 305 55.4 224 5 315 54.2 225 5 325 57.5 226 5 335 66.0 227 5 345 67.1 228 5 355 66.9 229 -5 5 75.4 230 -5 15 79.3 232 -5 35 49.8 233 -5 45 43.5 234 -5 55 51.8 235 -5 65 64.3 236 -5 75 71.2 237 -5 85 73.6 238 -5 95 75.3 239 -5 105 72.5 240 -5 115 52.9 241 -5 125 45.5 242 -5 135 54.1 243 -5 145 66.0 244 -5 155 66.5 245 -5 165 64.6 246 -5 175 61.8 247 -5 185 54.3 248 -5 195 49.5 249 -5 205 43.5 250 -5 215 42.8 251 -5 225 38.0 252 -5 235 38.7 253 -5 245 43.5 254 -5 255 52.8 255 -5 265 67.1 256 -5 275 79.9 257 -5 285 88.9 260 -5 315 46.7 261 -5 325 43.5 262 -5 335 47.7 263 -5 345 60.1 264 -5 355 71.1 265 -15 5 85.7 266 -15 15 72.7 268 -15 35 41.0 269 -15 45 38.8 270 -15 55 51.6 271 -15 65 56.2 272 -15 75 63.3 273 -15 85 65.6 274 -15 95 61.7 275 -15 105 53.1 276 -15 115 27.4 277 -15 125 31.6 278 -15 135 42.8 279 -15 145 45.9 280 -15 155 53.8 281 -15 165 60.2 282 -15 175 64.8 283 -15 185 66.0 284 -15 195 61.9 285 -15 205 60.8 286 -15 215 56.3 287 -15 225 48.9 288 -15 235 46.9 289 -15 245 52.5 290 -15 255 60.3 291 -15 265 72.4 292 -15 275 85.6 293 -15 285 85.3 297 -15 325 54.8 298 -15 335 55.5 299 -15 345 68.2 300 -15 355 85.7 301 -25 5 71.9 302 -25 15 60.9 304 -25 35 54.6 305 -25 45 52.3 306 -25 55 52.3 307 -25 65 55.7 308 -25 75 58.5 309 -25 85 60.6 310 -25 95 62.6 311 -25 105 64.2 312 -25 115 37.2 315 -25 145 36.5 316 -25 155 46.4 317 -25 165 52.9 318 -25 175 59.8 319 -25 185 64.4 320 -25 195 66.9 321 -25 205 68.8 322 -25 215 68.0 323 -25 225 68.6 324 -25 235 61.1 325 -25 245 58.7 326 -25 255 62.9 327 -25 265 66.4 328 -25 275 70.1 329 -25 285 76.6 332 -25 315 67.8 333 -25 325 65.8 334 -25 335 63.5 335 -25 345 63.5 336 -25 355 69.1 337 -35 5 71.8 338 -35 15 57.0 339 -35 25 60.9 340 -35 35 65.9 341 -35 45 68.3 342 -35 55 66.7 343 -35 65 68.3 344 -35 75 70.9 345 -35 85 72.1 346 -35 95 71.1 347 -35 105 73.3 348 -35 115 63.9 349 -35 125 66.7 350 -35 135 68.1 351 -35 145 62.4 352 -35 155 59.5 353 -35 165 65.9 354 -35 175 63.6 355 -35 185 67.2 356 -35 195 71.6 357 -35 205 72.8 358 -35 215 77.5 359 -35 225 73.8 360 -35 235 75.4 361 -35 245 74.1 362 -35 255 75.8 363 -35 265 75.0 364 -35 275 73.8 365 -35 285 69.5 366 -35 295 59.0 367 -35 305 60.5 368 -35 315 66.7 369 -35 325 69.4 370 -35 335 69.9 371 -35 345 73.8 372 -35 355 72.5 373 -45 5 78.7 376 -45 35 79.2 377 -45 45 77.5 378 -45 55 84.4 379 -45 65 83.0 380 -45 75 76.2 381 -45 85 79.4 382 -45 95 83.5 383 -45 105 78.4 384 -45 115 74.9 385 -45 125 74.9 386 -45 135 77.6 387 -45 145 68.7 388 -45 155 70.3 389 -45 165 76.7 390 -45 175 64.4 391 -45 185 73.6 392 -45 195 80.6 393 -45 205 79.5 394 -45 215 82.2 395 -45 225 84.4 396 -45 235 83.0 397 -45 245 80.6 400 -45 275 82.1 401 -45 285 78.0 402 -45 295 59.8 403 -45 305 66.2 404 -45 315 75.4 405 -45 325 79.6 406 -45 335 80.6 407 -45 345 85.7 408 -45 355 84.2 409 -55 10 84.7 411 -55 50 85.8 412 -55 70 80.6 413 -55 90 85.1 414 -55 110 81.5 415 -55 130 83.9 416 -55 150 83.7 417 -55 170 85.8 418 -55 190 79.9 419 -55 210 82.0 420 -55 230 86.5 421 -55 250 89.3 422 -55 270 83.0 423 -55 290 75.0 424 -55 310 81.6 425 -55 330 79.3 426 -55 350 84.5 429 -65 50 73.1 430 -65 70 84.4 432 -65 110 82.5 433 -65 130 80.8 434 -65 150 86.1 441 -65 290 84.0 442 -65 310 82.7 444 -65 350 81.3 453 -75 340 70.6