Total Cloud Cover Average Cloud Amount (%) December, January, February (1954 - 1997) , Ship Observations Only Global Average: 68.0 Zonal Averages 17 zones Lat.N Average 85 56.5 75 67.4 65 80.5 55 81.6 45 79.1 35 71.1 25 59.1 15 52.0 5 62.9 -5 60.7 -15 61.7 -25 61.9 -35 67.4 -45 78.5 -55 86.5 -65 87.9 -75 81.2 Grid Box Averages 396 filled boxes Box # Lat.N Lon.E Average 1 85 60 62.7 2 85 180 54.8 3 85 300 50.1 4 75 20 83.6 5 75 60 81.7 6 75 100 56.2 7 75 140 53.1 8 75 180 55.3 9 75 220 63.2 11 75 300 65.3 12 75 340 76.6 13 65 10 79.9 14 65 30 80.2 15 65 50 79.8 21 65 170 80.8 22 65 190 84.5 23 65 210 71.8 26 65 270 67.5 27 65 290 82.2 28 65 310 77.7 29 65 330 82.9 30 65 350 82.1 31 55 10 75.8 32 55 30 78.5 37 55 130 70.0 38 55 150 77.7 39 55 170 82.2 40 55 190 82.7 41 55 210 83.4 42 55 230 82.5 45 55 290 73.5 46 55 310 86.9 47 55 330 82.8 48 55 350 78.5 49 45 5 57.5 50 45 15 59.4 51 45 25 69.6 52 45 35 72.3 53 45 45 71.7 54 45 55 68.3 61 45 125 53.8 62 45 135 57.5 63 45 145 73.5 64 45 155 82.8 65 45 165 81.2 66 45 175 80.7 67 45 185 80.3 68 45 195 80.4 69 45 205 82.8 70 45 215 82.7 71 45 225 82.5 72 45 235 76.7 77 45 285 64.6 78 45 295 77.3 79 45 305 83.3 80 45 315 85.0 81 45 325 81.5 82 45 335 79.6 83 45 345 77.5 84 45 355 74.6 85 35 5 56.9 86 35 15 58.5 87 35 25 59.0 88 35 35 53.6 89 35 45 68.5 90 35 55 59.5 96 35 115 33.0 97 35 125 63.6 98 35 135 69.2 99 35 145 70.6 100 35 155 76.7 101 35 165 75.1 102 35 175 74.2 103 35 185 74.7 104 35 195 75.3 105 35 205 76.2 106 35 215 77.3 107 35 225 77.1 108 35 235 67.0 109 35 245 49.9 112 35 275 58.8 113 35 285 69.1 114 35 295 77.8 115 35 305 74.3 116 35 315 71.5 117 35 325 71.2 118 35 335 71.5 119 35 345 66.5 120 35 355 52.8 124 25 35 28.3 125 25 45 43.7 126 25 55 30.3 127 25 65 23.9 128 25 75 15.3 129 25 85 28.9 130 25 95 26.5 131 25 105 84.2 132 25 115 72.2 133 25 125 75.0 134 25 135 67.4 135 25 145 63.0 136 25 155 62.1 137 25 165 59.9 138 25 175 59.9 139 25 185 59.8 140 25 195 59.2 141 25 205 60.8 142 25 215 67.6 143 25 225 72.8 144 25 235 72.4 145 25 245 48.5 146 25 255 46.1 147 25 265 63.0 148 25 275 57.0 149 25 285 56.2 150 25 295 54.1 151 25 305 54.1 152 25 315 56.7 153 25 325 58.4 154 25 335 54.7 155 25 345 39.9 156 25 355 53.4 160 15 35 36.5 161 15 45 30.7 162 15 55 34.0 163 15 65 33.9 164 15 75 26.7 165 15 85 43.1 166 15 95 36.9 167 15 105 67.1 168 15 115 58.6 169 15 125 61.4 170 15 135 62.0 171 15 145 57.3 172 15 155 52.9 173 15 165 51.3 174 15 175 52.2 175 15 185 53.3 176 15 195 54.2 177 15 205 54.9 178 15 215 63.0 179 15 225 69.8 180 15 235 73.2 181 15 245 64.7 182 15 255 41.4 183 15 265 27.9 184 15 275 44.4 185 15 285 46.5 186 15 295 46.6 187 15 305 49.5 188 15 315 53.1 189 15 325 59.2 190 15 335 52.5 191 15 345 37.1 193 5 5 62.9 197 5 45 42.4 198 5 55 48.6 199 5 65 47.6 200 5 75 47.5 201 5 85 62.4 202 5 95 65.9 203 5 105 68.7 204 5 115 68.9 205 5 125 65.3 206 5 135 67.9 207 5 145 67.3 208 5 155 68.3 209 5 165 68.8 210 5 175 68.1 211 5 185 67.2 212 5 195 63.0 213 5 205 64.6 214 5 215 66.8 215 5 225 66.9 216 5 235 69.0 217 5 245 66.9 218 5 255 60.8 219 5 265 56.6 220 5 275 52.6 221 5 285 55.1 222 5 295 56.9 223 5 305 59.1 224 5 315 69.2 225 5 325 69.6 226 5 335 67.7 227 5 345 51.8 228 5 355 61.1 229 -5 5 68.1 230 -5 15 67.0 232 -5 35 52.1 233 -5 45 49.8 234 -5 55 58.3 235 -5 65 62.9 236 -5 75 65.8 237 -5 85 67.1 238 -5 95 71.0 239 -5 105 76.6 240 -5 115 76.1 241 -5 125 71.1 242 -5 135 72.8 243 -5 145 74.9 244 -5 155 70.7 245 -5 165 72.6 246 -5 175 70.9 247 -5 185 65.0 248 -5 195 59.0 249 -5 205 51.2 250 -5 215 45.3 251 -5 225 43.0 252 -5 235 42.3 253 -5 245 48.7 254 -5 255 56.2 255 -5 265 61.6 256 -5 275 63.0 257 -5 285 53.2 260 -5 315 61.8 261 -5 325 53.2 262 -5 335 52.1 263 -5 345 55.0 264 -5 355 59.4 265 -15 5 75.0 266 -15 15 63.0 268 -15 35 55.2 269 -15 45 59.7 270 -15 55 59.9 271 -15 65 58.8 272 -15 75 62.6 273 -15 85 61.0 274 -15 95 63.2 275 -15 105 62.3 276 -15 115 53.0 277 -15 125 64.4 278 -15 135 70.9 279 -15 145 66.7 280 -15 155 61.5 281 -15 165 63.0 282 -15 175 66.6 283 -15 185 68.8 284 -15 195 70.2 285 -15 205 66.0 286 -15 215 60.8 287 -15 225 53.6 288 -15 235 51.7 289 -15 245 52.7 290 -15 255 59.1 291 -15 265 63.8 292 -15 275 69.1 293 -15 285 62.8 297 -15 325 55.0 298 -15 335 51.7 299 -15 345 58.9 300 -15 355 67.8 301 -25 5 69.9 302 -25 15 56.8 304 -25 35 55.7 305 -25 45 56.4 306 -25 55 58.9 307 -25 65 58.4 308 -25 75 57.9 309 -25 85 59.9 310 -25 95 66.7 311 -25 105 67.7 312 -25 115 43.1 315 -25 145 61.3 316 -25 155 58.7 317 -25 165 59.8 318 -25 175 64.1 319 -25 185 65.8 320 -25 195 68.5 321 -25 205 70.9 322 -25 215 68.1 323 -25 225 61.9 324 -25 235 57.0 325 -25 245 54.6 326 -25 255 56.3 327 -25 265 62.9 328 -25 275 72.3 329 -25 285 73.0 332 -25 315 61.5 333 -25 325 60.7 334 -25 335 57.0 335 -25 345 54.7 336 -25 355 61.1 337 -35 5 67.0 338 -35 15 49.5 339 -35 25 56.6 340 -35 35 63.7 341 -35 45 62.9 342 -35 55 66.8 343 -35 65 69.4 344 -35 75 69.1 345 -35 85 69.8 346 -35 95 72.7 347 -35 105 72.1 348 -35 115 55.4 349 -35 125 68.6 350 -35 135 64.9 351 -35 145 58.4 352 -35 155 62.0 353 -35 165 67.2 354 -35 175 61.2 355 -35 185 66.4 356 -35 195 70.6 357 -35 205 72.7 358 -35 215 74.4 359 -35 225 75.5 360 -35 235 69.6 361 -35 245 69.3 362 -35 255 72.9 363 -35 265 71.6 364 -35 275 74.3 365 -35 285 67.0 366 -35 295 47.4 367 -35 305 53.6 368 -35 315 61.8 369 -35 325 69.0 370 -35 335 70.4 371 -35 345 70.0 372 -35 355 66.6 373 -45 5 82.9 374 -45 15 81.3 375 -45 25 81.5 376 -45 35 83.2 377 -45 45 80.5 378 -45 55 80.6 379 -45 65 81.6 380 -45 75 80.1 381 -45 85 83.5 382 -45 95 83.1 383 -45 105 81.5 384 -45 115 79.3 385 -45 125 80.4 386 -45 135 79.3 387 -45 145 69.4 388 -45 155 72.4 389 -45 165 77.8 390 -45 175 66.1 391 -45 185 74.4 392 -45 195 78.2 393 -45 205 78.9 394 -45 215 82.0 395 -45 225 82.3 396 -45 235 82.9 397 -45 245 83.7 398 -45 255 85.4 399 -45 265 81.6 400 -45 275 77.3 401 -45 285 77.2 402 -45 295 54.2 403 -45 305 59.3 404 -45 315 70.5 405 -45 325 76.7 406 -45 335 80.3 407 -45 345 79.6 408 -45 355 82.0 409 -55 10 89.6 410 -55 30 89.7 411 -55 50 89.4 412 -55 70 87.3 413 -55 90 89.7 414 -55 110 86.8 415 -55 130 85.2 416 -55 150 87.6 417 -55 170 85.2 418 -55 190 84.4 419 -55 210 88.0 420 -55 230 89.6 421 -55 250 84.9 422 -55 270 83.8 423 -55 290 76.1 424 -55 310 81.2 425 -55 330 86.9 426 -55 350 89.5 427 -65 10 84.0 428 -65 30 73.7 429 -65 50 79.7 430 -65 70 81.6 431 -65 90 87.0 432 -65 110 84.2 433 -65 130 87.9 434 -65 150 88.2 435 -65 170 90.5 436 -65 190 91.7 437 -65 210 93.2 438 -65 230 94.3 439 -65 250 93.4 440 -65 270 91.2 441 -65 290 84.8 442 -65 310 90.0 443 -65 330 93.1 444 -65 350 87.8 449 -75 180 73.9 450 -75 220 87.7 451 -75 260 89.7 452 -75 300 80.6 453 -75 340 78.3