Total Cloud Cover Average Cloud Amount (%) January (1954 - 1997) , Ship Observations Only Global Average: 67.9 Zonal Averages 17 zones Lat.N Average 85 55.7 75 66.5 65 81.7 55 82.3 45 79.6 35 71.2 25 59.6 15 52.0 5 63.0 -5 60.9 -15 62.1 -25 61.1 -35 66.3 -45 78.2 -55 86.6 -65 88.1 -75 80.8 Grid Box Averages 389 filled boxes Box # Lat.N Lon.E Average 1 85 60 63.7 2 85 180 53.3 3 85 300 48.0 4 75 20 83.6 5 75 60 76.2 7 75 140 50.7 8 75 180 54.5 9 75 220 61.7 12 75 340 74.8 13 65 10 80.3 14 65 30 78.6 15 65 50 78.9 21 65 170 82.0 22 65 190 84.0 23 65 210 68.8 28 65 310 79.2 29 65 330 82.9 30 65 350 82.5 31 55 10 76.7 32 55 30 79.4 38 55 150 78.7 39 55 170 82.9 40 55 190 82.2 41 55 210 84.2 42 55 230 83.4 46 55 310 88.0 47 55 330 82.4 48 55 350 78.8 49 45 5 56.6 50 45 15 61.8 51 45 25 70.4 52 45 35 73.2 53 45 45 75.1 54 45 55 72.3 61 45 125 58.3 62 45 135 58.9 63 45 145 75.8 64 45 155 83.2 65 45 165 80.6 66 45 175 81.0 67 45 185 80.8 68 45 195 81.0 69 45 205 83.5 70 45 215 82.9 71 45 225 82.2 72 45 235 77.3 77 45 285 62.8 78 45 295 77.8 79 45 305 84.4 80 45 315 85.7 81 45 325 81.9 82 45 335 80.2 83 45 345 77.9 84 45 355 75.3 85 35 5 56.6 86 35 15 59.9 87 35 25 60.5 88 35 35 56.9 89 35 45 74.7 90 35 55 64.8 96 35 115 36.8 97 35 125 64.8 98 35 135 70.8 99 35 145 70.6 100 35 155 75.9 101 35 165 73.8 102 35 175 73.5 103 35 185 72.9 104 35 195 74.5 105 35 205 76.4 106 35 215 78.5 107 35 225 77.5 108 35 235 67.2 109 35 245 50.5 112 35 275 61.1 113 35 285 70.1 114 35 295 78.8 115 35 305 74.6 116 35 315 71.3 117 35 325 71.3 118 35 335 71.5 119 35 345 66.4 120 35 355 51.0 124 25 35 30.7 125 25 45 44.4 126 25 55 33.1 127 25 65 25.7 128 25 75 16.2 129 25 85 26.6 130 25 95 29.7 131 25 105 79.7 132 25 115 72.2 133 25 125 75.8 134 25 135 66.9 135 25 145 62.7 136 25 155 62.2 137 25 165 60.7 138 25 175 60.4 139 25 185 60.8 140 25 195 61.2 141 25 205 61.9 142 25 215 68.2 143 25 225 73.3 144 25 235 72.4 145 25 245 49.8 146 25 255 48.8 147 25 265 65.7 148 25 275 57.8 149 25 285 56.9 150 25 295 53.9 151 25 305 53.8 152 25 315 56.5 153 25 325 57.7 154 25 335 54.3 155 25 345 38.7 160 15 35 40.8 161 15 45 32.1 162 15 55 36.0 163 15 65 35.8 164 15 75 26.0 165 15 85 41.1 166 15 95 36.9 167 15 105 66.5 168 15 115 60.0 169 15 125 62.3 170 15 135 63.2 171 15 145 58.8 172 15 155 53.0 173 15 165 49.8 174 15 175 50.5 175 15 185 52.7 176 15 195 54.7 177 15 205 55.3 178 15 215 62.7 179 15 225 68.7 180 15 235 72.5 181 15 245 66.2 182 15 255 41.7 183 15 265 26.1 184 15 275 43.9 185 15 285 44.8 186 15 295 45.5 187 15 305 48.6 188 15 315 51.8 189 15 325 59.3 190 15 335 54.5 191 15 345 38.7 193 5 5 62.0 197 5 45 42.8 198 5 55 48.4 199 5 65 48.7 200 5 75 45.4 201 5 85 62.8 202 5 95 65.0 203 5 105 69.0 204 5 115 69.1 205 5 125 66.1 206 5 135 68.8 207 5 145 67.5 208 5 155 67.5 209 5 165 70.3 210 5 175 67.9 211 5 185 68.5 212 5 195 63.3 213 5 205 65.6 214 5 215 67.8 215 5 225 67.4 216 5 235 65.9 217 5 245 66.8 218 5 255 59.3 219 5 265 57.1 220 5 275 50.9 221 5 285 52.5 222 5 295 54.8 223 5 305 59.2 224 5 315 70.8 225 5 325 71.8 226 5 335 69.5 227 5 345 50.1 228 5 355 59.5 229 -5 5 67.7 230 -5 15 64.6 232 -5 35 51.8 233 -5 45 51.6 234 -5 55 60.1 235 -5 65 64.7 236 -5 75 68.7 237 -5 85 69.3 238 -5 95 73.0 239 -5 105 77.6 240 -5 115 78.3 241 -5 125 72.5 242 -5 135 75.6 243 -5 145 74.4 244 -5 155 71.2 245 -5 165 72.8 246 -5 175 70.9 247 -5 185 64.9 248 -5 195 58.3 249 -5 205 50.0 250 -5 215 43.9 251 -5 225 42.1 252 -5 235 40.9 253 -5 245 47.0 254 -5 255 54.5 255 -5 265 58.5 256 -5 275 62.7 257 -5 285 51.2 260 -5 315 63.0 261 -5 325 53.8 262 -5 335 52.6 263 -5 345 54.6 264 -5 355 58.6 265 -15 5 74.7 266 -15 15 61.4 268 -15 35 54.5 269 -15 45 61.3 270 -15 55 61.7 271 -15 65 61.2 272 -15 75 63.0 273 -15 85 59.8 274 -15 95 63.5 275 -15 105 63.3 276 -15 115 56.8 277 -15 125 66.9 278 -15 135 74.5 279 -15 145 69.7 280 -15 155 62.7 281 -15 165 63.7 282 -15 175 67.8 283 -15 185 69.1 284 -15 195 70.2 285 -15 205 65.2 286 -15 215 59.8 287 -15 225 51.9 288 -15 235 54.3 289 -15 245 53.0 290 -15 255 58.8 291 -15 265 62.5 292 -15 275 68.2 293 -15 285 61.4 297 -15 325 54.6 298 -15 335 52.3 299 -15 345 56.9 300 -15 355 66.5 301 -25 5 68.5 302 -25 15 55.4 304 -25 35 55.3 305 -25 45 55.1 306 -25 55 57.3 307 -25 65 57.4 308 -25 75 56.9 309 -25 85 58.7 310 -25 95 66.0 311 -25 105 68.6 312 -25 115 43.4 315 -25 145 62.8 316 -25 155 60.6 317 -25 165 60.4 318 -25 175 64.3 319 -25 185 65.7 320 -25 195 70.1 321 -25 205 72.2 322 -25 215 69.2 323 -25 225 58.7 324 -25 235 55.4 325 -25 245 52.9 326 -25 255 57.3 327 -25 265 61.2 328 -25 275 70.0 329 -25 285 71.3 332 -25 315 61.8 333 -25 325 60.1 334 -25 335 54.1 335 -25 345 50.1 336 -25 355 58.6 337 -35 5 65.7 338 -35 15 48.2 339 -35 25 57.7 340 -35 35 63.2 341 -35 45 63.0 342 -35 55 66.1 343 -35 65 68.9 344 -35 75 66.6 345 -35 85 67.6 346 -35 95 71.3 347 -35 105 70.8 348 -35 115 52.5 349 -35 125 66.4 350 -35 135 61.6 351 -35 145 56.7 352 -35 155 61.5 353 -35 165 66.8 354 -35 175 60.5 355 -35 185 64.4 356 -35 195 69.1 357 -35 205 72.7 358 -35 215 74.6 359 -35 225 76.4 360 -35 235 68.5 361 -35 245 64.0 362 -35 255 74.1 363 -35 265 70.3 364 -35 275 73.5 365 -35 285 63.3 366 -35 295 50.0 367 -35 305 54.5 368 -35 315 59.3 369 -35 325 69.0 370 -35 335 70.7 371 -35 345 69.3 372 -35 355 66.1 373 -45 5 82.4 374 -45 15 81.3 375 -45 25 82.8 376 -45 35 84.7 377 -45 45 77.1 378 -45 55 81.6 379 -45 65 81.8 380 -45 75 80.2 381 -45 85 83.1 382 -45 95 83.7 383 -45 105 82.6 384 -45 115 78.2 385 -45 125 83.0 386 -45 135 82.1 387 -45 145 69.5 388 -45 155 73.0 389 -45 165 78.4 390 -45 175 65.3 391 -45 185 73.2 392 -45 195 78.5 393 -45 205 78.3 394 -45 215 80.0 395 -45 225 78.3 396 -45 235 82.3 397 -45 245 81.5 398 -45 255 83.4 399 -45 265 76.8 400 -45 275 74.6 401 -45 285 76.9 402 -45 295 51.7 403 -45 305 58.9 404 -45 315 72.4 405 -45 325 76.0 406 -45 335 80.0 407 -45 345 81.2 408 -45 355 83.9 409 -55 10 89.3 410 -55 30 87.7 411 -55 50 88.2 412 -55 70 87.9 413 -55 90 90.2 414 -55 110 86.2 415 -55 130 85.9 416 -55 150 88.6 417 -55 170 85.4 418 -55 190 85.3 419 -55 210 89.0 420 -55 230 89.2 421 -55 250 84.0 422 -55 270 83.6 423 -55 290 76.4 424 -55 310 80.9 425 -55 330 88.2 426 -55 350 90.2 427 -65 10 83.1 428 -65 30 69.3 429 -65 50 80.8 430 -65 70 81.6 431 -65 90 86.6 432 -65 110 83.0 433 -65 130 87.4 434 -65 150 90.2 435 -65 170 90.8 436 -65 190 91.8 437 -65 210 94.4 438 -65 230 95.1 439 -65 250 94.5 440 -65 270 94.2 441 -65 290 85.1 442 -65 310 89.7 443 -65 330 94.3 444 -65 350 87.0 449 -75 180 69.9 450 -75 220 93.3 451 -75 260 86.7 452 -75 300 77.3 453 -75 340 80.3