Total Cloud Cover Average Cloud Amount (%) December (1953 - 1996) , Ship Observations Only Global Average: 68.8 Zonal Averages 17 zones Lat.N Average 85 60.3 75 70.0 65 82.7 55 81.6 45 78.9 35 70.7 25 59.6 15 54.6 5 65.2 -5 61.2 -15 62.2 -25 63.4 -35 68.3 -45 78.4 -55 87.0 -65 88.2 -75 73.4 Grid Box Averages 387 filled boxes Box # Lat.N Lon.E Average 1 85 60 68.2 2 85 180 58.1 3 85 300 52.4 4 75 20 84.0 5 75 60 85.6 6 75 100 62.5 7 75 140 60.3 8 75 180 56.9 9 75 220 58.6 12 75 340 85.7 13 65 10 80.3 14 65 30 81.8 15 65 50 83.4 21 65 170 79.7 22 65 190 88.8 23 65 210 71.5 27 65 290 86.2 28 65 310 76.5 29 65 330 83.5 30 65 350 81.4 31 55 10 77.3 32 55 30 82.1 38 55 150 77.9 39 55 170 80.2 40 55 190 82.8 41 55 210 82.8 42 55 230 82.2 45 55 290 77.2 46 55 310 87.0 47 55 330 83.3 48 55 350 78.3 49 45 5 57.7 50 45 15 59.7 51 45 25 67.8 52 45 35 72.4 53 45 45 73.4 54 45 55 66.9 61 45 125 52.3 62 45 135 54.4 63 45 145 75.8 64 45 155 82.6 65 45 165 81.8 66 45 175 80.2 67 45 185 79.1 68 45 195 79.6 69 45 205 82.3 70 45 215 82.6 71 45 225 82.8 72 45 235 76.5 77 45 285 67.4 78 45 295 79.0 79 45 305 83.3 80 45 315 84.1 81 45 325 81.1 82 45 335 79.6 83 45 345 77.7 84 45 355 74.4 85 35 5 57.4 86 35 15 58.5 87 35 25 58.9 88 35 35 53.4 89 35 45 63.5 90 35 55 61.3 96 35 115 38.4 97 35 125 62.0 98 35 135 67.0 99 35 145 68.8 100 35 155 76.1 101 35 165 75.7 102 35 175 75.0 103 35 185 75.2 104 35 195 76.2 105 35 205 76.2 106 35 215 76.7 107 35 225 76.8 108 35 235 65.7 109 35 245 47.5 112 35 275 57.7 113 35 285 68.3 114 35 295 76.0 115 35 305 73.7 116 35 315 71.3 117 35 325 70.7 118 35 335 71.6 119 35 345 66.7 120 35 355 54.4 124 25 35 29.1 125 25 45 42.9 126 25 55 29.7 127 25 65 25.0 128 25 75 17.7 129 25 85 34.3 130 25 95 28.9 131 25 105 77.7 132 25 115 68.6 133 25 125 73.7 134 25 135 68.8 135 25 145 64.4 136 25 155 61.9 137 25 165 58.6 138 25 175 59.9 139 25 185 60.3 140 25 195 60.5 141 25 205 61.5 142 25 215 67.7 143 25 225 72.8 144 25 235 72.6 145 25 245 49.7 146 25 255 50.2 147 25 265 63.2 148 25 275 58.1 149 25 285 57.1 150 25 295 55.4 151 25 305 54.9 152 25 315 57.3 153 25 325 58.5 154 25 335 55.2 155 25 345 40.9 160 15 35 33.4 161 15 45 26.0 162 15 55 34.9 163 15 65 37.2 164 15 75 30.2 165 15 85 53.7 166 15 95 47.5 167 15 105 68.7 168 15 115 64.4 169 15 125 64.5 170 15 135 63.7 171 15 145 56.2 172 15 155 52.4 173 15 165 51.7 174 15 175 54.1 175 15 185 55.9 176 15 195 57.4 177 15 205 57.6 178 15 215 65.7 179 15 225 72.4 180 15 235 74.5 181 15 245 66.5 182 15 255 46.3 183 15 265 31.8 184 15 275 48.5 185 15 285 50.0 186 15 295 48.8 187 15 305 50.5 188 15 315 54.4 189 15 325 59.8 190 15 335 55.7 191 15 345 40.6 193 5 5 63.4 197 5 45 42.8 198 5 55 51.1 199 5 65 51.8 200 5 75 54.2 201 5 85 66.6 202 5 95 71.1 203 5 105 75.1 204 5 115 73.7 205 5 125 64.1 206 5 135 67.4 207 5 145 65.7 208 5 155 65.8 209 5 165 68.3 210 5 175 68.6 211 5 185 68.0 212 5 195 64.8 213 5 205 65.6 214 5 215 66.9 215 5 225 67.1 216 5 235 71.5 217 5 245 71.9 218 5 255 69.4 219 5 265 62.7 220 5 275 61.8 221 5 285 65.3 223 5 305 60.4 224 5 315 65.3 225 5 325 67.3 226 5 335 70.7 227 5 345 56.8 228 5 355 64.8 229 -5 5 73.5 230 -5 15 70.2 232 -5 35 52.0 233 -5 45 48.3 234 -5 55 58.0 235 -5 65 61.5 236 -5 75 63.7 237 -5 85 67.2 238 -5 95 69.6 239 -5 105 77.5 240 -5 115 75.7 241 -5 125 68.6 242 -5 135 67.6 243 -5 145 73.3 244 -5 155 68.2 245 -5 165 69.8 246 -5 175 73.2 247 -5 185 67.1 248 -5 195 58.8 249 -5 205 51.6 250 -5 215 44.8 251 -5 225 42.5 252 -5 235 42.0 253 -5 245 48.5 254 -5 255 60.1 255 -5 265 66.8 256 -5 275 65.7 257 -5 285 57.8 260 -5 315 51.5 261 -5 325 48.8 262 -5 335 51.3 263 -5 345 60.9 264 -5 355 68.1 265 -15 5 80.3 266 -15 15 60.4 268 -15 35 54.5 269 -15 45 54.6 270 -15 55 54.5 271 -15 65 54.6 272 -15 75 61.5 273 -15 85 62.1 274 -15 95 63.1 275 -15 105 61.4 276 -15 115 46.4 277 -15 125 56.6 278 -15 135 61.2 279 -15 145 57.9 280 -15 155 55.4 281 -15 165 60.7 282 -15 175 63.5 283 -15 185 67.4 284 -15 195 70.5 285 -15 205 67.6 286 -15 215 62.2 287 -15 225 55.1 288 -15 235 51.1 289 -15 245 55.6 290 -15 255 63.8 291 -15 265 70.7 292 -15 275 74.5 293 -15 285 69.1 297 -15 325 58.3 298 -15 335 56.1 299 -15 345 68.2 300 -15 355 77.4 301 -25 5 71.3 302 -25 15 55.6 304 -25 35 57.8 305 -25 45 57.4 306 -25 55 59.1 307 -25 65 56.9 308 -25 75 57.7 309 -25 85 59.4 310 -25 95 65.5 311 -25 105 66.8 312 -25 115 41.7 315 -25 145 48.4 316 -25 155 53.3 317 -25 165 57.3 318 -25 175 61.3 319 -25 185 64.0 320 -25 195 67.2 321 -25 205 70.3 322 -25 215 71.5 323 -25 225 67.3 324 -25 235 61.0 325 -25 245 60.6 326 -25 255 60.6 327 -25 265 65.5 328 -25 275 74.7 329 -25 285 76.4 332 -25 315 65.5 333 -25 325 67.0 334 -25 335 62.1 335 -25 345 61.7 336 -25 355 65.4 337 -35 5 66.8 338 -35 15 49.3 339 -35 25 55.4 340 -35 35 64.4 341 -35 45 62.7 342 -35 55 66.1 343 -35 65 69.0 344 -35 75 69.3 345 -35 85 69.3 346 -35 95 72.1 347 -35 105 72.0 348 -35 115 58.7 349 -35 125 68.4 350 -35 135 67.5 351 -35 145 62.9 352 -35 155 63.0 353 -35 165 67.4 354 -35 175 62.5 355 -35 185 66.8 356 -35 195 70.0 357 -35 205 72.2 358 -35 215 73.7 359 -35 225 74.8 360 -35 235 72.3 361 -35 245 77.7 362 -35 255 76.1 363 -35 265 70.6 364 -35 275 75.7 365 -35 285 70.3 367 -35 305 54.4 368 -35 315 63.8 369 -35 325 68.8 370 -35 335 73.6 371 -35 345 74.1 372 -35 355 68.4 373 -45 5 82.3 374 -45 15 80.8 375 -45 25 81.2 376 -45 35 78.7 377 -45 45 80.2 378 -45 55 79.5 379 -45 65 81.5 380 -45 75 79.5 381 -45 85 83.5 382 -45 95 83.3 383 -45 105 81.3 384 -45 115 81.0 385 -45 125 76.9 386 -45 135 77.2 387 -45 145 70.7 388 -45 155 72.6 389 -45 165 78.3 390 -45 175 69.4 391 -45 185 73.8 392 -45 195 78.4 393 -45 205 78.1 394 -45 215 83.0 395 -45 225 84.8 396 -45 235 85.3 397 -45 245 85.3 398 -45 255 83.9 399 -45 265 78.5 400 -45 275 81.2 401 -45 285 77.7 402 -45 295 54.8 403 -45 305 61.3 404 -45 315 66.5 405 -45 325 77.3 406 -45 335 80.4 407 -45 345 79.0 408 -45 355 82.2 409 -55 10 89.8 410 -55 30 91.9 411 -55 50 90.8 412 -55 70 87.5 413 -55 90 90.5 414 -55 110 87.8 415 -55 130 85.0 416 -55 150 88.1 417 -55 170 86.0 418 -55 190 84.8 419 -55 210 89.9 420 -55 230 89.5 421 -55 250 84.3 422 -55 270 85.3 423 -55 290 76.0 424 -55 310 82.3 425 -55 330 85.3 426 -55 350 89.0 427 -65 10 86.6 428 -65 30 74.8 429 -65 50 81.6 430 -65 70 84.9 431 -65 90 88.5 432 -65 110 87.1 433 -65 130 89.0 434 -65 150 84.2 435 -65 170 90.0 436 -65 190 92.2 437 -65 210 92.6 438 -65 230 93.8 439 -65 250 93.2 440 -65 270 92.7 441 -65 290 85.4 442 -65 310 89.6 443 -65 330 88.4 444 -65 350 88.8 449 -75 180 69.7 453 -75 340 79.3