Total Cloud Cover Average Cloud Amount (%) January (1954 - 1997) Day, Ship Observations Only Global Average: 67.4 Zonal Averages 17 zones Lat.N Average 85 53.7 75 71.1 65 83.1 55 82.9 45 80.0 35 72.0 25 59.8 15 51.6 5 62.6 -5 60.0 -15 60.6 -25 59.7 -35 64.9 -45 77.2 -55 85.3 -65 87.4 -75 79.7 Grid Box Averages 381 filled boxes Box # Lat.N Lon.E Average 2 85 180 53.7 4 75 20 85.8 5 75 60 80.3 8 75 180 58.0 9 75 220 59.6 12 75 340 76.6 13 65 10 81.5 14 65 30 78.4 15 65 50 80.6 21 65 170 79.8 22 65 190 85.0 23 65 210 74.3 28 65 310 81.7 29 65 330 84.9 30 65 350 83.8 31 55 10 78.1 32 55 30 80.9 38 55 150 79.0 39 55 170 82.5 40 55 190 82.6 41 55 210 85.5 42 55 230 84.8 46 55 310 88.1 47 55 330 83.1 48 55 350 80.3 49 45 5 58.8 50 45 15 62.8 51 45 25 73.1 52 45 35 77.0 53 45 45 76.3 54 45 55 72.8 62 45 135 61.6 63 45 145 75.4 64 45 155 83.1 65 45 165 81.3 66 45 175 80.3 67 45 185 80.7 68 45 195 81.1 69 45 205 83.6 70 45 215 83.4 71 45 225 83.3 72 45 235 78.5 77 45 285 65.1 78 45 295 79.1 79 45 305 84.6 80 45 315 85.6 81 45 325 82.0 82 45 335 80.0 83 45 345 78.2 84 45 355 76.1 85 35 5 58.1 86 35 15 61.6 87 35 25 62.7 88 35 35 58.1 90 35 55 66.4 96 35 115 39.0 97 35 125 66.8 98 35 135 72.8 99 35 145 71.6 100 35 155 76.1 101 35 165 74.4 102 35 175 73.4 103 35 185 73.1 104 35 195 74.5 105 35 205 77.0 106 35 215 78.4 107 35 225 77.7 108 35 235 68.2 109 35 245 51.9 112 35 275 61.0 113 35 285 72.1 114 35 295 79.3 115 35 305 75.1 116 35 315 72.4 117 35 325 71.5 118 35 335 72.1 119 35 345 66.6 120 35 355 54.6 124 25 35 33.5 125 25 45 47.1 126 25 55 35.5 127 25 65 26.9 128 25 75 17.2 129 25 85 28.3 130 25 95 30.6 131 25 105 80.7 132 25 115 73.9 133 25 125 76.2 134 25 135 66.8 135 25 145 62.4 136 25 155 62.6 137 25 165 59.8 138 25 175 59.6 139 25 185 59.2 140 25 195 60.6 141 25 205 61.8 142 25 215 68.3 143 25 225 72.4 144 25 235 70.6 145 25 245 50.4 146 25 255 49.6 147 25 265 66.8 148 25 275 58.7 149 25 285 58.1 150 25 295 55.1 151 25 305 54.8 152 25 315 56.8 153 25 325 58.2 154 25 335 55.5 155 25 345 40.0 160 15 35 45.5 161 15 45 34.9 162 15 55 36.1 163 15 65 34.8 164 15 75 27.6 165 15 85 41.5 166 15 95 36.6 167 15 105 69.0 168 15 115 60.8 169 15 125 63.1 170 15 135 63.5 171 15 145 57.3 172 15 155 52.6 173 15 165 48.8 174 15 175 49.2 175 15 185 50.1 176 15 195 53.5 177 15 205 55.2 178 15 215 62.1 179 15 225 67.6 180 15 235 70.7 181 15 245 64.8 182 15 255 42.6 183 15 265 26.6 184 15 275 41.9 185 15 285 46.8 186 15 295 47.0 187 15 305 48.7 188 15 315 51.5 189 15 325 57.8 190 15 335 52.5 191 15 345 37.1 193 5 5 63.6 197 5 45 44.0 198 5 55 48.0 199 5 65 49.3 200 5 75 47.5 201 5 85 64.1 202 5 95 64.9 203 5 105 70.9 204 5 115 69.9 205 5 125 66.8 206 5 135 69.6 207 5 145 67.9 208 5 155 68.0 209 5 165 69.2 210 5 175 67.3 211 5 185 67.6 212 5 195 63.3 213 5 205 66.7 214 5 215 66.5 215 5 225 64.7 216 5 235 64.5 217 5 245 63.9 218 5 255 55.5 219 5 265 54.8 220 5 275 49.3 221 5 285 55.1 223 5 305 59.0 224 5 315 70.7 225 5 325 70.2 226 5 335 68.9 227 5 345 51.6 228 5 355 61.3 229 -5 5 65.0 230 -5 15 68.7 232 -5 35 51.8 233 -5 45 53.0 234 -5 55 61.3 235 -5 65 63.5 236 -5 75 69.1 237 -5 85 69.5 238 -5 95 72.1 239 -5 105 77.9 240 -5 115 78.3 241 -5 125 72.3 242 -5 135 76.0 243 -5 145 75.0 244 -5 155 70.9 245 -5 165 72.6 246 -5 175 70.4 247 -5 185 64.3 248 -5 195 57.3 249 -5 205 52.5 250 -5 215 45.0 251 -5 225 42.5 252 -5 235 41.3 253 -5 245 45.6 254 -5 255 51.1 255 -5 265 52.1 256 -5 275 54.9 257 -5 285 52.4 260 -5 315 63.8 261 -5 325 54.7 262 -5 335 52.6 263 -5 345 52.2 264 -5 355 54.4 265 -15 5 67.4 266 -15 15 63.7 268 -15 35 56.2 269 -15 45 64.8 270 -15 55 61.0 271 -15 65 60.6 272 -15 75 61.1 273 -15 85 58.8 274 -15 95 61.2 275 -15 105 62.9 276 -15 115 58.3 277 -15 125 69.0 278 -15 135 75.0 279 -15 145 68.4 280 -15 155 62.5 281 -15 165 64.1 282 -15 175 67.7 283 -15 185 69.5 284 -15 195 68.5 285 -15 205 65.1 286 -15 215 61.5 287 -15 225 53.0 288 -15 235 53.6 289 -15 245 52.0 290 -15 255 53.8 291 -15 265 55.7 292 -15 275 61.1 293 -15 285 61.6 297 -15 325 55.6 298 -15 335 50.1 299 -15 345 51.5 300 -15 355 59.4 301 -25 5 60.3 302 -25 15 58.5 304 -25 35 54.1 305 -25 45 54.6 306 -25 55 58.2 307 -25 65 56.3 308 -25 75 54.6 309 -25 85 55.6 310 -25 95 60.1 311 -25 105 68.1 312 -25 115 43.8 315 -25 145 61.3 316 -25 155 58.1 317 -25 165 59.3 318 -25 175 63.3 319 -25 185 64.7 320 -25 195 67.5 321 -25 205 71.1 322 -25 215 69.2 323 -25 225 62.1 324 -25 235 57.2 325 -25 245 52.7 326 -25 255 54.8 327 -25 265 55.3 328 -25 275 64.3 329 -25 285 73.0 332 -25 315 61.6 333 -25 325 62.2 334 -25 335 56.4 335 -25 345 48.1 336 -25 355 53.9 337 -35 5 61.2 338 -35 15 49.5 339 -35 25 54.8 340 -35 35 61.1 341 -35 45 62.7 342 -35 55 64.9 343 -35 65 65.3 344 -35 75 64.3 345 -35 85 64.5 346 -35 95 67.3 347 -35 105 71.8 348 -35 115 53.9 349 -35 125 67.2 350 -35 135 63.2 351 -35 145 56.5 352 -35 155 59.4 353 -35 165 63.6 354 -35 175 59.0 355 -35 185 62.8 356 -35 195 69.4 357 -35 205 71.3 358 -35 215 73.5 359 -35 225 72.7 360 -35 235 68.9 361 -35 245 63.7 362 -35 255 72.3 363 -35 265 65.3 364 -35 275 71.2 365 -35 285 67.1 367 -35 305 54.3 368 -35 315 59.7 369 -35 325 69.2 370 -35 335 69.3 371 -35 345 67.1 372 -35 355 64.0 373 -45 5 82.3 374 -45 15 81.3 375 -45 25 81.9 376 -45 35 83.3 377 -45 45 77.0 378 -45 55 80.9 379 -45 65 80.4 380 -45 75 78.0 381 -45 85 82.2 382 -45 95 81.9 383 -45 105 82.4 384 -45 115 76.8 385 -45 125 80.4 386 -45 135 78.9 387 -45 145 69.7 388 -45 155 71.8 389 -45 165 77.1 390 -45 175 64.1 391 -45 185 71.9 392 -45 195 77.5 393 -45 205 78.8 394 -45 215 80.5 395 -45 225 77.5 396 -45 235 81.7 397 -45 245 80.4 398 -45 255 81.1 399 -45 265 74.5 400 -45 275 72.3 401 -45 285 77.6 402 -45 295 52.3 403 -45 305 60.2 404 -45 315 70.8 405 -45 325 74.9 406 -45 335 79.7 407 -45 345 79.7 408 -45 355 82.9 409 -55 10 87.5 410 -55 30 87.2 411 -55 50 86.5 412 -55 70 86.3 413 -55 90 88.8 414 -55 110 85.1 415 -55 130 84.7 416 -55 150 86.6 417 -55 170 84.0 418 -55 190 83.8 419 -55 210 88.6 420 -55 230 88.0 421 -55 250 82.0 422 -55 270 82.9 423 -55 290 76.2 424 -55 310 80.2 425 -55 330 87.0 426 -55 350 88.8 427 -65 10 82.3 428 -65 30 69.2 429 -65 50 80.1 430 -65 70 80.2 431 -65 90 84.7 432 -65 110 83.3 433 -65 130 87.7 434 -65 150 89.7 435 -65 170 90.2 436 -65 190 91.9 437 -65 210 93.6 438 -65 230 94.0 439 -65 250 93.6 440 -65 270 92.9 441 -65 290 83.8 442 -65 310 89.0 443 -65 330 94.0 444 -65 350 86.6 449 -75 180 69.3 450 -75 220 94.7 452 -75 300 77.1 453 -75 340 79.3