Total Cloud Cover Average Cloud Amount (%) December, January, February (1954 - 1997) Night, Ship Observations Only Global Average: 68.6 Zonal Averages 17 zones Lat.N Average 85 56.4 75 67.0 65 80.4 55 81.2 45 78.6 35 70.5 25 59.1 15 52.2 5 63.0 -5 61.6 -15 63.2 -25 63.5 -35 68.8 -45 79.5 -55 87.6 -65 88.5 -75 81.6 Grid Box Averages 387 filled boxes Box # Lat.N Lon.E Average 1 85 60 62.1 2 85 180 54.4 3 85 300 51.5 4 75 20 82.1 5 75 60 80.2 7 75 140 52.5 8 75 180 53.9 9 75 220 62.5 12 75 340 73.5 13 65 10 78.8 14 65 30 79.7 15 65 50 78.0 21 65 170 82.8 22 65 190 83.3 23 65 210 67.0 27 65 290 82.2 28 65 310 74.7 29 65 330 81.6 30 65 350 80.8 31 55 10 74.4 32 55 30 77.0 38 55 150 76.9 39 55 170 82.2 40 55 190 82.2 41 55 210 82.2 42 55 230 81.2 46 55 310 87.0 47 55 330 82.4 48 55 350 77.2 49 45 5 55.8 50 45 15 57.0 51 45 25 67.1 52 45 35 69.9 53 45 45 68.0 54 45 55 64.7 62 45 135 54.3 63 45 145 72.8 64 45 155 82.8 65 45 165 81.1 66 45 175 81.3 67 45 185 80.5 68 45 195 80.1 69 45 205 82.3 70 45 215 82.1 71 45 225 82.1 72 45 235 75.5 77 45 285 63.4 78 45 295 76.8 79 45 305 83.1 80 45 315 84.8 81 45 325 81.5 82 45 335 79.5 83 45 345 77.0 84 45 355 73.8 85 35 5 55.5 86 35 15 56.1 87 35 25 56.8 88 35 35 51.8 89 35 45 63.2 90 35 55 55.9 96 35 115 29.0 97 35 125 62.2 98 35 135 67.1 99 35 145 69.6 100 35 155 76.5 101 35 165 75.0 102 35 175 74.5 103 35 185 75.1 104 35 195 75.0 105 35 205 75.8 106 35 215 77.3 107 35 225 77.0 108 35 235 66.6 109 35 245 48.1 112 35 275 58.5 113 35 285 67.2 114 35 295 77.3 115 35 305 73.9 116 35 315 70.7 117 35 325 70.8 118 35 335 71.3 119 35 345 66.6 120 35 355 50.5 124 25 35 24.9 125 25 45 42.4 126 25 55 27.5 127 25 65 21.6 128 25 75 13.3 129 25 85 28.4 130 25 95 25.1 131 25 105 79.6 132 25 115 70.3 133 25 125 74.5 134 25 135 67.7 135 25 145 63.8 136 25 155 62.5 137 25 165 60.7 138 25 175 61.0 139 25 185 61.4 140 25 195 59.1 141 25 205 60.5 142 25 215 67.9 143 25 225 74.2 144 25 235 74.0 145 25 245 47.7 146 25 255 44.9 147 25 265 62.1 148 25 275 56.5 149 25 285 55.0 150 25 295 53.3 151 25 305 53.4 152 25 315 56.5 153 25 325 58.3 154 25 335 54.3 155 25 345 39.4 160 15 35 31.6 161 15 45 27.8 162 15 55 33.5 163 15 65 34.2 164 15 75 25.2 165 15 85 43.3 166 15 95 36.7 167 15 105 65.2 168 15 115 57.3 169 15 125 60.8 170 15 135 61.8 171 15 145 58.1 172 15 155 53.0 173 15 165 52.3 174 15 175 53.2 175 15 185 54.8 176 15 195 54.7 177 15 205 54.6 178 15 215 63.9 179 15 225 71.6 180 15 235 75.3 181 15 245 65.7 182 15 255 41.0 183 15 265 27.9 184 15 275 46.2 185 15 285 45.0 186 15 295 45.2 187 15 305 49.3 188 15 315 53.6 189 15 325 60.2 190 15 335 52.6 191 15 345 36.7 193 5 5 61.8 197 5 45 41.6 198 5 55 49.5 199 5 65 47.2 200 5 75 46.2 201 5 85 61.7 202 5 95 66.1 203 5 105 66.9 204 5 115 67.9 205 5 125 64.7 206 5 135 67.0 207 5 145 67.3 208 5 155 68.2 209 5 165 69.1 210 5 175 68.1 211 5 185 67.6 212 5 195 62.6 213 5 205 64.1 214 5 215 66.7 215 5 225 67.7 216 5 235 70.6 217 5 245 69.4 218 5 255 63.2 219 5 265 58.1 220 5 275 54.6 221 5 285 52.1 223 5 305 59.0 224 5 315 69.5 225 5 325 70.0 226 5 335 67.4 227 5 345 49.4 228 5 355 59.8 229 -5 5 70.8 230 -5 15 62.7 232 -5 35 53.2 233 -5 45 48.6 234 -5 55 57.8 235 -5 65 64.1 236 -5 75 65.5 237 -5 85 66.9 238 -5 95 71.2 239 -5 105 76.2 240 -5 115 75.7 241 -5 125 71.4 242 -5 135 71.7 243 -5 145 74.5 244 -5 155 70.0 245 -5 165 72.6 246 -5 175 70.2 247 -5 185 64.7 248 -5 195 60.3 249 -5 205 50.8 250 -5 215 44.2 251 -5 225 42.2 252 -5 235 42.4 253 -5 245 51.1 254 -5 255 59.9 255 -5 265 67.4 256 -5 275 70.5 257 -5 285 52.1 260 -5 315 60.8 261 -5 325 52.3 262 -5 335 52.3 263 -5 345 58.1 264 -5 355 63.6 265 -15 5 82.1 266 -15 15 61.3 268 -15 35 54.3 269 -15 45 57.0 270 -15 55 60.5 271 -15 65 59.4 272 -15 75 63.7 273 -15 85 61.9 274 -15 95 65.0 275 -15 105 62.6 276 -15 115 51.8 277 -15 125 62.7 278 -15 135 69.0 279 -15 145 67.2 280 -15 155 61.1 281 -15 165 61.6 282 -15 175 66.7 283 -15 185 67.9 284 -15 195 71.6 285 -15 205 66.4 286 -15 215 59.4 287 -15 225 53.2 288 -15 235 52.5 289 -15 245 53.8 290 -15 255 64.3 291 -15 265 71.2 292 -15 275 76.1 293 -15 285 62.7 297 -15 325 54.1 298 -15 335 53.0 299 -15 345 64.8 300 -15 355 74.2 301 -25 5 78.2 302 -25 15 53.9 304 -25 35 57.0 305 -25 45 57.8 306 -25 55 59.5 307 -25 65 59.9 308 -25 75 60.7 309 -25 85 63.1 310 -25 95 71.8 311 -25 105 68.6 312 -25 115 43.9 315 -25 145 63.2 316 -25 155 59.8 317 -25 165 60.7 318 -25 175 65.3 319 -25 185 66.1 320 -25 195 70.6 321 -25 205 72.1 322 -25 215 68.4 323 -25 225 60.5 324 -25 235 56.2 325 -25 245 55.0 326 -25 255 58.5 327 -25 265 68.8 328 -25 275 77.5 329 -25 285 70.9 332 -25 315 61.9 333 -25 325 59.6 334 -25 335 55.4 335 -25 345 57.2 336 -25 355 66.4 337 -35 5 71.5 338 -35 15 48.3 339 -35 25 58.1 340 -35 35 66.4 341 -35 45 62.9 342 -35 55 67.7 343 -35 65 72.2 344 -35 75 71.8 345 -35 85 72.9 346 -35 95 77.0 347 -35 105 71.5 348 -35 115 54.8 349 -35 125 68.7 350 -35 135 64.2 351 -35 145 58.9 352 -35 155 63.8 353 -35 165 69.9 354 -35 175 62.5 355 -35 185 68.4 356 -35 195 70.4 357 -35 205 73.5 358 -35 215 75.4 359 -35 225 77.2 360 -35 235 70.6 361 -35 245 70.7 362 -35 255 74.1 363 -35 265 75.0 364 -35 275 76.1 365 -35 285 64.7 367 -35 305 53.4 368 -35 315 62.3 369 -35 325 69.7 370 -35 335 71.8 371 -35 345 72.1 372 -35 355 69.0 373 -45 5 83.0 374 -45 15 81.2 375 -45 25 82.3 376 -45 35 85.0 377 -45 45 82.8 378 -45 55 81.3 379 -45 65 82.3 380 -45 75 81.7 381 -45 85 84.5 382 -45 95 85.1 383 -45 105 81.5 384 -45 115 80.3 385 -45 125 81.6 386 -45 135 80.5 387 -45 145 69.1 388 -45 155 73.5 389 -45 165 78.9 390 -45 175 67.3 391 -45 185 75.9 392 -45 195 77.9 393 -45 205 79.0 394 -45 215 82.6 395 -45 225 83.3 396 -45 235 83.2 397 -45 245 85.6 398 -45 255 88.4 399 -45 265 83.9 400 -45 275 79.6 401 -45 285 76.0 402 -45 295 53.5 403 -45 305 58.5 404 -45 315 71.3 405 -45 325 77.4 406 -45 335 82.1 407 -45 345 80.4 408 -45 355 83.2 409 -55 10 90.7 410 -55 30 90.3 411 -55 50 91.3 412 -55 70 88.8 413 -55 90 91.0 414 -55 110 88.0 415 -55 130 86.6 416 -55 150 89.1 417 -55 170 86.5 418 -55 190 84.2 419 -55 210 89.2 420 -55 230 91.0 421 -55 250 86.7 422 -55 270 84.6 423 -55 290 76.0 424 -55 310 81.6 425 -55 330 88.0 426 -55 350 91.0 427 -65 10 84.6 428 -65 30 73.5 429 -65 50 80.5 430 -65 70 82.7 431 -65 90 87.8 432 -65 110 84.2 433 -65 130 88.1 434 -65 150 88.7 435 -65 170 91.1 436 -65 190 92.0 437 -65 210 94.2 438 -65 230 94.9 439 -65 250 94.5 440 -65 270 91.9 441 -65 290 85.6 442 -65 310 90.4 443 -65 330 93.4 444 -65 350 88.2 449 -75 180 74.6 450 -75 220 87.2 451 -75 260 90.1 452 -75 300 81.0 453 -75 340 79.3