Total Cloud Cover Average Cloud Amount (%) December (1953 - 1996) Day, Ship Observations Only Global Average: 68.2 Zonal Averages 17 zones Lat.N Average 85 57.1 75 70.9 65 83.8 55 82.5 45 79.6 35 71.2 25 59.5 15 54.8 5 65.4 -5 60.1 -15 60.5 -25 61.2 -35 66.8 -45 77.4 -55 85.9 -65 87.5 -75 72.8 Grid Box Averages 381 filled boxes Box # Lat.N Lon.E Average 2 85 180 57.1 4 75 20 85.8 5 75 60 86.5 6 75 100 60.1 8 75 180 55.8 9 75 220 55.6 12 75 340 84.9 13 65 10 81.6 14 65 30 82.7 15 65 50 84.3 21 65 170 77.3 22 65 190 89.6 23 65 210 73.7 27 65 290 85.9 28 65 310 80.0 29 65 330 84.5 30 65 350 82.9 31 55 10 78.3 32 55 30 82.9 38 55 150 79.4 39 55 170 80.6 40 55 190 83.8 41 55 210 83.7 42 55 230 83.8 45 55 290 77.0 46 55 310 87.6 47 55 330 83.8 48 55 350 79.9 49 45 5 58.9 50 45 15 61.5 51 45 25 71.3 52 45 35 75.3 53 45 45 75.1 54 45 55 70.1 62 45 135 58.8 63 45 145 77.1 64 45 155 82.8 65 45 165 82.0 66 45 175 79.6 67 45 185 78.9 68 45 195 80.2 69 45 205 83.3 70 45 215 83.0 71 45 225 83.1 72 45 235 78.0 77 45 285 68.3 78 45 295 79.1 79 45 305 84.2 80 45 315 84.5 81 45 325 81.4 82 45 335 80.3 83 45 345 78.2 84 45 355 75.4 85 35 5 59.0 86 35 15 60.7 87 35 25 60.5 88 35 35 55.1 90 35 55 62.5 96 35 115 39.1 97 35 125 62.9 98 35 135 68.8 99 35 145 69.6 100 35 155 76.4 101 35 165 75.7 102 35 175 74.7 103 35 185 74.9 104 35 195 76.8 105 35 205 76.4 106 35 215 76.7 107 35 225 76.8 108 35 235 65.5 109 35 245 48.5 112 35 275 59.1 113 35 285 70.2 114 35 295 76.6 115 35 305 74.3 116 35 315 72.1 117 35 325 70.8 118 35 335 71.1 119 35 345 66.6 120 35 355 55.4 124 25 35 33.6 125 25 45 42.6 126 25 55 32.7 127 25 65 27.9 128 25 75 19.2 129 25 85 31.0 131 25 105 78.7 132 25 115 71.6 133 25 125 74.5 134 25 135 68.3 135 25 145 63.4 136 25 155 61.0 137 25 165 58.9 138 25 175 58.4 139 25 185 58.2 140 25 195 60.4 141 25 205 61.5 142 25 215 66.8 143 25 225 71.3 144 25 235 72.0 145 25 245 49.8 146 25 255 52.2 147 25 265 63.7 148 25 275 58.1 149 25 285 58.0 150 25 295 55.4 151 25 305 55.5 152 25 315 57.9 153 25 325 58.7 154 25 335 54.7 155 25 345 41.0 160 15 35 39.8 161 15 45 28.7 162 15 55 35.6 163 15 65 37.6 164 15 75 33.3 165 15 85 54.2 166 15 95 48.4 167 15 105 71.1 168 15 115 65.8 169 15 125 65.4 170 15 135 63.5 171 15 145 55.9 172 15 155 52.3 173 15 165 51.2 174 15 175 54.0 175 15 185 55.4 176 15 195 56.2 177 15 205 57.8 178 15 215 64.5 179 15 225 70.0 180 15 235 72.2 181 15 245 66.6 182 15 255 47.8 183 15 265 32.3 184 15 275 46.4 185 15 285 51.2 186 15 295 50.4 187 15 305 51.2 188 15 315 53.8 189 15 325 60.1 190 15 335 56.2 191 15 345 42.8 193 5 5 63.9 197 5 45 44.5 198 5 55 50.5 199 5 65 52.3 200 5 75 54.8 201 5 85 67.4 202 5 95 70.6 203 5 105 76.0 204 5 115 75.1 205 5 125 65.4 206 5 135 68.6 207 5 145 66.1 208 5 155 66.6 209 5 165 69.0 210 5 175 70.3 211 5 185 67.9 212 5 195 65.0 213 5 205 65.6 214 5 215 68.1 215 5 225 66.8 216 5 235 70.5 217 5 245 70.5 218 5 255 67.2 219 5 265 61.2 220 5 275 59.9 221 5 285 67.7 223 5 305 60.6 224 5 315 64.8 225 5 325 66.3 226 5 335 71.5 227 5 345 59.9 228 5 355 65.2 229 -5 5 69.8 230 -5 15 75.0 232 -5 35 51.2 233 -5 45 49.1 234 -5 55 58.3 235 -5 65 61.4 236 -5 75 63.7 237 -5 85 67.5 238 -5 95 70.0 239 -5 105 78.0 240 -5 115 75.8 241 -5 125 68.7 242 -5 135 69.5 243 -5 145 74.0 244 -5 155 69.6 245 -5 165 69.7 246 -5 175 74.7 247 -5 185 67.6 248 -5 195 57.9 249 -5 205 50.1 250 -5 215 46.9 251 -5 225 43.4 252 -5 235 41.6 253 -5 245 45.5 254 -5 255 54.4 255 -5 265 59.6 256 -5 275 57.4 257 -5 285 61.9 260 -5 315 52.6 261 -5 325 49.7 262 -5 335 50.6 263 -5 345 56.5 264 -5 355 61.6 265 -15 5 72.7 266 -15 15 63.4 268 -15 35 54.7 269 -15 45 56.9 270 -15 55 54.4 271 -15 65 53.9 272 -15 75 60.5 273 -15 85 61.0 274 -15 95 60.8 275 -15 105 60.0 276 -15 115 45.7 277 -15 125 58.1 278 -15 135 64.7 279 -15 145 58.3 280 -15 155 56.2 281 -15 165 61.6 282 -15 175 62.8 283 -15 185 68.4 284 -15 195 69.4 285 -15 205 66.5 286 -15 215 63.7 287 -15 225 55.0 288 -15 235 50.2 289 -15 245 53.5 290 -15 255 58.6 291 -15 265 62.1 292 -15 275 66.5 293 -15 285 70.0 297 -15 325 58.9 298 -15 335 54.8 299 -15 345 61.9 300 -15 355 71.1 301 -25 5 62.9 302 -25 15 58.8 304 -25 35 55.0 305 -25 45 56.0 306 -25 55 57.6 307 -25 65 54.5 308 -25 75 53.7 309 -25 85 55.8 310 -25 95 60.2 311 -25 105 65.6 312 -25 115 39.4 315 -25 145 48.5 316 -25 155 52.5 317 -25 165 56.0 318 -25 175 59.9 319 -25 185 63.7 320 -25 195 64.7 321 -25 205 68.9 322 -25 215 70.3 323 -25 225 67.4 324 -25 235 61.1 325 -25 245 58.8 326 -25 255 58.4 327 -25 265 59.0 328 -25 275 68.2 329 -25 285 77.6 332 -25 315 64.4 333 -25 325 67.0 334 -25 335 63.9 335 -25 345 58.5 336 -25 355 59.8 337 -35 5 62.9 338 -35 15 51.0 339 -35 25 54.8 340 -35 35 61.6 341 -35 45 62.1 342 -35 55 64.0 343 -35 65 66.0 344 -35 75 65.8 345 -35 85 66.9 346 -35 95 66.5 347 -35 105 72.0 348 -35 115 59.1 349 -35 125 68.8 350 -35 135 67.5 351 -35 145 62.0 352 -35 155 61.1 353 -35 165 64.4 354 -35 175 61.2 355 -35 185 64.8 356 -35 195 70.5 357 -35 205 72.1 358 -35 215 73.8 359 -35 225 73.9 360 -35 235 70.4 361 -35 245 76.6 362 -35 255 74.8 363 -35 265 68.8 364 -35 275 74.1 365 -35 285 71.6 367 -35 305 54.5 368 -35 315 61.6 369 -35 325 67.3 370 -35 335 72.5 371 -35 345 71.6 372 -35 355 65.3 373 -45 5 82.4 374 -45 15 81.3 375 -45 25 80.2 376 -45 35 75.9 377 -45 45 76.6 378 -45 55 80.3 379 -45 65 80.7 380 -45 75 78.2 381 -45 85 82.5 382 -45 95 81.1 383 -45 105 80.4 384 -45 115 79.4 385 -45 125 77.3 386 -45 135 77.1 387 -45 145 71.2 388 -45 155 71.6 389 -45 165 76.6 390 -45 175 67.3 391 -45 185 72.0 392 -45 195 79.4 393 -45 205 77.9 394 -45 215 81.7 395 -45 225 84.5 396 -45 235 85.3 397 -45 245 82.9 398 -45 255 80.2 399 -45 265 75.6 400 -45 275 78.8 401 -45 285 79.7 402 -45 295 54.3 403 -45 305 62.0 404 -45 315 66.7 405 -45 325 76.2 406 -45 335 78.7 407 -45 345 76.9 408 -45 355 80.9 409 -55 10 89.6 410 -55 30 91.3 411 -55 50 88.5 412 -55 70 86.0 413 -55 90 88.7 414 -55 110 86.6 415 -55 130 83.9 416 -55 150 87.1 417 -55 170 84.5 418 -55 190 86.8 419 -55 210 88.0 420 -55 230 87.9 421 -55 250 82.7 422 -55 270 83.5 423 -55 290 75.6 424 -55 310 81.3 425 -55 330 84.2 426 -55 350 87.4 427 -65 10 85.5 428 -65 30 74.4 429 -65 50 81.1 430 -65 70 83.7 431 -65 90 87.5 432 -65 110 86.7 433 -65 130 87.9 434 -65 150 83.0 435 -65 170 89.7 436 -65 190 91.3 437 -65 210 91.0 438 -65 230 92.8 439 -65 250 91.1 440 -65 270 94.0 441 -65 290 84.2 442 -65 310 89.1 443 -65 330 89.1 444 -65 350 87.6 449 -75 180 69.0 453 -75 340 79.0