Total Cloud Cover Average Cloud Amount (%) December (1953 - 1996) Night, Ship Observations Only Global Average: 69.5 Zonal Averages 17 zones Lat.N Average 85 62.0 75 71.0 65 81.7 55 80.8 45 78.3 35 70.3 25 59.8 15 54.5 5 65.0 -5 62.3 -15 63.9 -25 65.6 -35 69.9 -45 78.7 -55 88.4 -65 89.0 -75 74.0 Grid Box Averages 369 filled boxes Box # Lat.N Lon.E Average 1 85 60 64.9 2 85 180 59.1 4 75 20 82.3 5 75 60 84.6 8 75 180 58.0 9 75 220 61.7 13 65 10 79.0 14 65 30 80.8 15 65 50 82.6 21 65 170 82.0 22 65 190 87.9 23 65 210 65.0 27 65 290 87.2 28 65 310 73.0 29 65 330 82.5 30 65 350 80.0 31 55 10 76.2 32 55 30 81.3 38 55 150 76.5 39 55 170 79.8 40 55 190 81.7 41 55 210 82.0 42 55 230 80.6 46 55 310 86.4 47 55 330 82.8 48 55 350 76.8 49 45 5 56.5 50 45 15 57.9 51 45 25 64.2 52 45 35 69.5 53 45 45 65.6 54 45 55 63.7 62 45 135 50.0 63 45 145 74.4 64 45 155 82.4 65 45 165 81.7 66 45 175 80.7 67 45 185 79.3 68 45 195 78.9 69 45 205 81.3 70 45 215 82.2 71 45 225 82.6 72 45 235 74.8 77 45 285 66.4 78 45 295 79.0 79 45 305 82.4 80 45 315 83.7 81 45 325 80.8 82 45 335 78.9 83 45 345 77.1 84 45 355 73.4 85 35 5 55.9 86 35 15 56.2 87 35 25 57.4 88 35 35 51.6 97 35 125 61.0 98 35 135 65.2 99 35 145 68.0 100 35 155 75.8 101 35 165 75.6 102 35 175 75.4 103 35 185 75.5 104 35 195 75.6 105 35 205 75.9 106 35 215 76.7 107 35 225 76.8 108 35 235 65.8 109 35 245 46.6 112 35 275 56.3 113 35 285 66.4 114 35 295 75.4 115 35 305 73.1 116 35 315 70.6 117 35 325 70.6 118 35 335 72.1 119 35 345 66.9 120 35 355 53.4 124 25 35 24.7 125 25 45 44.3 126 25 55 26.8 127 25 65 22.1 129 25 85 37.5 132 25 115 65.7 133 25 125 72.9 134 25 135 69.3 135 25 145 65.4 136 25 155 62.8 137 25 165 58.2 138 25 175 61.5 139 25 185 62.4 140 25 195 60.7 141 25 205 61.5 142 25 215 68.5 143 25 225 74.4 144 25 235 73.3 145 25 245 49.5 146 25 255 48.3 147 25 265 62.7 148 25 275 58.0 149 25 285 56.3 150 25 295 55.3 151 25 305 54.3 152 25 315 56.8 153 25 325 58.3 154 25 335 55.7 155 25 345 40.8 160 15 35 27.0 161 15 45 23.2 162 15 55 34.1 163 15 65 36.9 164 15 75 27.1 165 15 85 53.3 166 15 95 46.6 167 15 105 66.4 168 15 115 63.0 169 15 125 63.6 170 15 135 64.0 171 15 145 56.5 172 15 155 52.5 173 15 165 52.1 174 15 175 54.2 175 15 185 56.5 176 15 195 58.5 177 15 205 57.4 178 15 215 67.0 179 15 225 74.7 180 15 235 76.7 181 15 245 66.4 182 15 255 44.8 183 15 265 31.4 184 15 275 50.6 185 15 285 48.9 186 15 295 47.2 187 15 305 49.8 188 15 315 54.9 189 15 325 59.6 190 15 335 55.1 191 15 345 38.4 193 5 5 62.8 197 5 45 41.0 198 5 55 51.8 199 5 65 51.2 200 5 75 53.7 201 5 85 65.8 202 5 95 71.6 203 5 105 74.1 204 5 115 72.3 205 5 125 62.9 206 5 135 66.2 207 5 145 65.4 208 5 155 65.1 209 5 165 67.7 210 5 175 66.9 211 5 185 68.0 212 5 195 64.6 213 5 205 65.5 214 5 215 65.7 215 5 225 67.4 216 5 235 72.5 217 5 245 73.4 218 5 255 71.6 219 5 265 64.3 220 5 275 63.6 221 5 285 62.8 223 5 305 60.1 224 5 315 65.8 225 5 325 68.2 226 5 335 69.8 227 5 345 53.7 228 5 355 64.5 229 -5 5 77.1 230 -5 15 65.3 232 -5 35 52.8 233 -5 45 47.5 234 -5 55 57.7 235 -5 65 61.7 236 -5 75 63.7 237 -5 85 66.9 238 -5 95 69.2 239 -5 105 77.0 240 -5 115 75.5 241 -5 125 68.5 242 -5 135 65.6 243 -5 145 72.6 244 -5 155 66.8 245 -5 165 69.9 246 -5 175 71.8 247 -5 185 66.5 248 -5 195 59.6 249 -5 205 53.1 250 -5 215 42.6 251 -5 225 41.5 252 -5 235 42.5 253 -5 245 51.5 254 -5 255 65.8 255 -5 265 74.0 256 -5 275 73.9 257 -5 285 53.7 260 -5 315 50.5 261 -5 325 48.0 262 -5 335 51.9 263 -5 345 65.2 264 -5 355 74.6 265 -15 5 87.9 266 -15 15 57.5 268 -15 35 54.2 269 -15 45 52.3 270 -15 55 54.7 271 -15 65 55.3 272 -15 75 62.5 273 -15 85 63.3 274 -15 95 65.3 275 -15 105 62.8 276 -15 115 47.1 277 -15 125 55.1 278 -15 135 57.7 279 -15 145 57.6 280 -15 155 54.6 281 -15 165 59.8 282 -15 175 64.3 283 -15 185 66.3 284 -15 195 71.6 285 -15 205 68.7 286 -15 215 60.8 287 -15 225 55.3 288 -15 235 52.0 289 -15 245 57.7 290 -15 255 68.9 291 -15 265 79.3 292 -15 275 82.5 293 -15 285 68.2 297 -15 325 57.6 298 -15 335 57.3 299 -15 345 74.4 300 -15 355 83.7 301 -25 5 79.7 302 -25 15 52.5 304 -25 35 60.6 305 -25 45 58.8 306 -25 55 60.6 307 -25 65 59.3 308 -25 75 61.8 309 -25 85 62.9 310 -25 95 70.9 311 -25 105 68.0 312 -25 115 44.0 316 -25 155 54.1 317 -25 165 58.5 318 -25 175 62.7 319 -25 185 64.3 320 -25 195 69.8 321 -25 205 71.6 322 -25 215 72.7 323 -25 225 67.3 324 -25 235 60.8 325 -25 245 62.5 326 -25 255 62.8 327 -25 265 71.9 328 -25 275 81.2 329 -25 285 75.1 332 -25 315 66.6 333 -25 325 66.9 334 -25 335 60.3 335 -25 345 64.9 336 -25 355 71.1 337 -35 5 70.7 338 -35 15 47.7 339 -35 25 56.1 340 -35 35 67.2 341 -35 45 63.4 342 -35 55 68.3 343 -35 65 72.0 344 -35 75 72.7 345 -35 85 71.8 346 -35 95 77.7 347 -35 105 72.0 348 -35 115 58.3 349 -35 125 68.0 350 -35 135 67.5 351 -35 145 63.7 352 -35 155 65.0 353 -35 165 70.4 354 -35 175 63.9 355 -35 185 68.9 356 -35 195 69.4 357 -35 205 72.2 358 -35 215 73.6 359 -35 225 75.7 360 -35 235 74.1 361 -35 245 78.8 362 -35 255 78.4 363 -35 265 72.4 364 -35 275 77.3 365 -35 285 68.9 367 -35 305 54.3 368 -35 315 66.0 369 -35 325 70.2 370 -35 335 74.7 371 -35 345 76.7 372 -35 355 71.5 373 -45 5 82.3 374 -45 15 80.4 375 -45 25 82.2 376 -45 35 81.4 377 -45 45 83.7 378 -45 55 78.7 379 -45 65 82.3 380 -45 75 80.9 381 -45 85 84.4 382 -45 95 85.4 383 -45 105 82.2 384 -45 115 82.6 385 -45 125 76.6 386 -45 135 77.2 387 -45 145 70.2 388 -45 155 73.6 389 -45 165 79.9 390 -45 175 71.6 391 -45 185 75.5 392 -45 195 77.5 393 -45 205 78.3 394 -45 215 84.4 395 -45 225 86.1 400 -45 275 83.6 401 -45 285 75.7 402 -45 295 55.4 403 -45 305 60.6 404 -45 315 66.5 405 -45 325 78.4 406 -45 335 82.2 407 -45 345 81.2 408 -45 355 83.5 409 -55 10 89.9 410 -55 30 92.4 411 -55 50 93.0 412 -55 70 89.0 413 -55 90 92.3 414 -55 110 89.0 415 -55 130 86.2 416 -55 150 89.2 417 -55 170 87.6 419 -55 210 91.9 420 -55 230 91.0 421 -55 250 85.9 422 -55 270 87.0 423 -55 290 76.4 424 -55 310 83.2 425 -55 330 86.4 426 -55 350 90.7 427 -65 10 87.8 428 -65 30 75.2 429 -65 50 82.2 430 -65 70 86.2 431 -65 90 89.4 432 -65 110 87.5 433 -65 130 90.2 434 -65 150 85.4 435 -65 170 90.3 436 -65 190 93.2 437 -65 210 94.1 438 -65 230 94.9 439 -65 250 95.2 440 -65 270 91.4 441 -65 290 86.6 442 -65 310 90.1 443 -65 330 87.7 444 -65 350 90.0 449 -75 180 70.5 453 -75 340 79.5